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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.session.pool;

import org.apache.iotdb.isession.Config;
import org.apache.iotdb.isession.ISession;
import org.apache.iotdb.isession.ISessionDataSet;
import org.apache.iotdb.isession.pool.ISessionDataSetWrapper;
import org.apache.iotdb.isession.pool.ISessionPool;
import org.apache.iotdb.isession.template.Template;
import org.apache.iotdb.isession.util.SystemStatus;
import org.apache.iotdb.rpc.IoTDBConnectionException;
import org.apache.iotdb.rpc.StatementExecutionException;
import org.apache.iotdb.service.rpc.thrift.TSBackupConfigurationResp;
import org.apache.iotdb.service.rpc.thrift.TSConnectionInfoResp;
import org.apache.iotdb.session.Session;
import org.apache.iotdb.tsfile.file.metadata.enums.CompressionType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.write.record.Tablet;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.time.ZoneId;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.ConcurrentMap;

/**
 * SessionPool is a wrapper of a Session Set. Using SessionPool, the user do not need to consider
 * how to reuse a session connection. Even if the session is disconnected, the session pool can
 * recognize it and remove the broken session connection and create a new one.
 *
 * 
If there is no available connections and the pool reaches its max size, the all methods will
 * hang until there is a available connection.
 *
 * 
If a user has waited for a session for more than 60 seconds, a warn log will be printed.
 *
 * 
The only thing you have to remember is that:
 *
 * 
For a query, if you have get all data, i.e., SessionDataSetWrapper.hasNext() == false, it is
 * ok. Otherwise, i.e., you want to stop the query before you get all data
 * (SessionDataSetWrapper.hasNext() == true), then you have to call
 * closeResultSet(SessionDataSetWrapper wrapper) manually. Otherwise the connection is occupied by
 * the query.
 *
 * 
Another case that you have to manually call closeResultSet() is that when there is exception
 * when you call SessionDataSetWrapper.hasNext() or next()
 */
public class SessionPool implements ISessionPool {

  private static final Logger logger = LoggerFactory.getLogger(SessionPool.class);
  public static final String SESSION_POOL_IS_CLOSED = "Session pool is closed";
  public static final String CLOSE_THE_SESSION_FAILED = "close the session failed.";

  private static final int RETRY = 3;
  private static final int FINAL_RETRY = RETRY - 1;

  private final ConcurrentLinkedDeque queue = new ConcurrentLinkedDeque<>();
  // for session whose resultSet is not released.
  private final ConcurrentMap occupied = new ConcurrentHashMap<>();
  private int size = 0;
  private int maxSize = 0;
  private final long waitToGetSessionTimeoutInMs;

  // parameters for Session constructor
  private final String host;
  private final int port;
  private final String user;
  private final String password;
  private final int fetchSize;
  private final ZoneId zoneId;
  private final boolean enableCacheLeader;

  // parameters for Session#open()
  private final int connectionTimeoutInMs;
  private final boolean enableCompression;

  // whether the queue is closed.
  private boolean closed;

  // Redirect-able SessionPool
  private final List nodeUrls;

  public SessionPool(String host, int port, String user, String password, int maxSize) {
    this(
        host,
        port,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        false,
        null,
        Config.DEFAULT_CACHE_LEADER_MODE,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  public SessionPool(List nodeUrls, String user, String password, int maxSize) {
    this(
        nodeUrls,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        false,
        null,
        Config.DEFAULT_CACHE_LEADER_MODE,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  public SessionPool(
      String host, int port, String user, String password, int maxSize, boolean enableCompression) {
    this(
        host,
        port,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        enableCompression,
        null,
        Config.DEFAULT_CACHE_LEADER_MODE,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  public SessionPool(
      List nodeUrls, String user, String password, int maxSize, boolean enableCompression) {
    this(
        nodeUrls,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        enableCompression,
        null,
        Config.DEFAULT_CACHE_LEADER_MODE,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  public SessionPool(
      String host,
      int port,
      String user,
      String password,
      int maxSize,
      boolean enableCompression,
      boolean enableCacheLeader) {
    this(
        host,
        port,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        enableCompression,
        null,
        enableCacheLeader,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  public SessionPool(
      List nodeUrls,
      String user,
      String password,
      int maxSize,
      boolean enableCompression,
      boolean enableCacheLeader) {
    this(
        nodeUrls,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        enableCompression,
        null,
        enableCacheLeader,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  public SessionPool(
      String host, int port, String user, String password, int maxSize, ZoneId zoneId) {
    this(
        host,
        port,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        false,
        zoneId,
        Config.DEFAULT_CACHE_LEADER_MODE,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  public SessionPool(
      List nodeUrls, String user, String password, int maxSize, ZoneId zoneId) {
    this(
        nodeUrls,
        user,
        password,
        maxSize,
        Config.DEFAULT_FETCH_SIZE,
        60_000,
        false,
        zoneId,
        Config.DEFAULT_CACHE_LEADER_MODE,
        Config.DEFAULT_CONNECTION_TIMEOUT_MS);
  }

  @SuppressWarnings("squid:S107")
  public SessionPool(
      String host,
      int port,
      String user,
      String password,
      int maxSize,
      int fetchSize,
      long waitToGetSessionTimeoutInMs,
      boolean enableCompression,
      ZoneId zoneId,
      boolean enableCacheLeader,
      int connectionTimeoutInMs) {
    this.maxSize = maxSize;
    this.host = host;
    this.port = port;
    this.nodeUrls = null;
    this.user = user;
    this.password = password;
    this.fetchSize = fetchSize;
    this.waitToGetSessionTimeoutInMs = waitToGetSessionTimeoutInMs;
    this.enableCompression = enableCompression;
    this.zoneId = zoneId;
    this.enableCacheLeader = enableCacheLeader;
    this.connectionTimeoutInMs = connectionTimeoutInMs;
  }

  public SessionPool(
      List nodeUrls,
      String user,
      String password,
      int maxSize,
      int fetchSize,
      long waitToGetSessionTimeoutInMs,
      boolean enableCompression,
      ZoneId zoneId,
      boolean enableCacheLeader,
      int connectionTimeoutInMs) {
    this.maxSize = maxSize;
    this.host = null;
    this.port = -1;
    this.nodeUrls = nodeUrls;
    this.user = user;
    this.password = password;
    this.fetchSize = fetchSize;
    this.waitToGetSessionTimeoutInMs = waitToGetSessionTimeoutInMs;
    this.enableCompression = enableCompression;
    this.zoneId = zoneId;
    this.enableCacheLeader = enableCacheLeader;
    this.connectionTimeoutInMs = connectionTimeoutInMs;
  }

  private Session constructNewSession() {
    Session session;
    if (nodeUrls == null) {
      // Construct custom Session
      session =
          new Session.Builder()
              .host(host)
              .port(port)
              .username(user)
              .password(password)
              .fetchSize(fetchSize)
              .zoneId(zoneId)
              .enableCacheLeader(enableCacheLeader)
              .build();
    } else {
      // Construct redirect-able Session
      session =
          new Session.Builder()
              .nodeUrls(nodeUrls)
              .username(user)
              .password(password)
              .fetchSize(fetchSize)
              .zoneId(zoneId)
              .enableCacheLeader(enableCacheLeader)
              .build();
    }
    return session;
  }

  // if this method throws an exception, either the server is broken, or the ip/port/user/password
  // is incorrect.
  @SuppressWarnings({"squid:S3776", "squid:S2446"}) // Suppress high Cognitive Complexity warning
  private ISession getSession() throws IoTDBConnectionException {
    ISession session = queue.poll();
    if (closed) {
      throw new IoTDBConnectionException(SESSION_POOL_IS_CLOSED);
    }
    if (session != null) {
      return session;
    }

    boolean shouldCreate = false;

    long start = System.currentTimeMillis();
    while (session == null) {
      synchronized (this) {
        if (size < maxSize) {
          // we can create more session
          size++;
          shouldCreate = true;
          // but we do it after skip synchronized block because connection a session is time
          // consuming.
          break;
        }

        // we have to wait for someone returns a session.
        try {
          if (logger.isDebugEnabled()) {
            logger.debug("no more sessions can be created, wait... queue.size={}", queue.size());
          }
          this.wait(1000);
          long timeOut = Math.min(waitToGetSessionTimeoutInMs, 60_000);
          if (System.currentTimeMillis() - start > timeOut) {
            logger.warn(
                "the SessionPool has wait for {} seconds to get a new connection: {}:{} with {}, {}",
                (System.currentTimeMillis() - start) / 1000,
                host,
                port,
                user,
                password);
            logger.warn(
                "current occupied size {}, queue size {}, considered size {} ",
                occupied.size(),
                queue.size(),
                size);
            if (System.currentTimeMillis() - start > waitToGetSessionTimeoutInMs) {
              throw new IoTDBConnectionException(
                  String.format("timeout to get a connection from %s:%s", host, port));
            }
          }
        } catch (InterruptedException e) {
          // wake up from this.wait(1000) by this.notify()
        }

        session = queue.poll();

        if (closed) {
          throw new IoTDBConnectionException(SESSION_POOL_IS_CLOSED);
        }
      }
    }

    if (shouldCreate) {
      // create a new one.
      if (logger.isDebugEnabled()) {
        if (nodeUrls == null) {
          logger.debug("Create a new Session {}, {}, {}, {}", host, port, user, password);
        } else {
          logger.debug("Create a new redirect Session {}, {}, {}", nodeUrls, user, password);
        }
      }

      session = constructNewSession();

      try {
        session.open(enableCompression, connectionTimeoutInMs);
        // avoid someone has called close() the session pool
        synchronized (this) {
          if (closed) {
            // have to release the connection...
            session.close();
            throw new IoTDBConnectionException(SESSION_POOL_IS_CLOSED);
          }
        }
      } catch (IoTDBConnectionException e) {
        // if exception, we will throw the exception.
        // Meanwhile, we have to set size--
        synchronized (this) {
          size--;
          // we do not need to notifyAll as any waited thread can continue to work after waked up.
          this.notify();
          if (logger.isDebugEnabled()) {
            logger.debug("open session failed, reduce the count and notify others...");
          }
        }
        throw e;
      }
    }

    return session;
  }

  @Override
  public int currentAvailableSize() {
    return queue.size();
  }

  @Override
  public int currentOccupiedSize() {
    return occupied.size();
  }

  @SuppressWarnings({"squid:S2446"})
  private void putBack(ISession session) {
    queue.push(session);
    synchronized (this) {
      // we do not need to notifyAll as any waited thread can continue to work after waked up.
      this.notify();
      // comment the following codes as putBack is too frequently called.
      //      if (logger.isTraceEnabled()) {
      //        logger.trace("put a session back and notify others..., queue.size = {}",
      // queue.size());
      //      }
    }
  }

  private void occupy(ISession session) {
    occupied.put(session, session);
  }

  @Override
  /** close all connections in the pool */
  public synchronized void close() {
    for (ISession session : queue) {
      try {
        session.close();
      } catch (IoTDBConnectionException e) {
        // do nothing
        logger.warn(CLOSE_THE_SESSION_FAILED, e);
      }
    }
    for (ISession session : occupied.keySet()) {
      try {
        session.close();
      } catch (IoTDBConnectionException e) {
        // do nothing
        logger.warn(CLOSE_THE_SESSION_FAILED, e);
      }
    }
    logger.info("closing the session pool, cleaning queues...");
    this.closed = true;
    queue.clear();
    occupied.clear();
  }

  @Override
  public void closeResultSet(ISessionDataSetWrapper wrapper) {
    boolean putback = true;
    try {
      wrapper.getSessionDataSet().closeOperationHandle();
    } catch (IoTDBConnectionException | StatementExecutionException e) {
      tryConstructNewSession();
      putback = false;
    } finally {
      ISession session = occupied.remove(wrapper.getSession());
      if (putback && session != null) {
        putBack(wrapper.getSession());
      }
    }
  }

  @SuppressWarnings({"squid:S2446"})
  private void tryConstructNewSession() {
    Session session = constructNewSession();
    try {
      session.open(enableCompression, connectionTimeoutInMs);
      // avoid someone has called close() the session pool
      synchronized (this) {
        if (closed) {
          // have to release the connection...
          session.close();
          throw new IoTDBConnectionException(SESSION_POOL_IS_CLOSED);
        }
        queue.push(session);
        this.notify();
      }
    } catch (IoTDBConnectionException e) {
      synchronized (this) {
        size--;
        // we do not need to notifyAll as any waited thread can continue to work after waked up.
        this.notify();
        if (logger.isDebugEnabled()) {
          logger.debug("open session failed, reduce the count and notify others...");
        }
      }
    }
  }

  private void closeSession(ISession session) {
    if (session != null) {
      try {
        session.close();
      } catch (Exception e2) {
        // do nothing. We just want to guarantee the session is closed.
        logger.warn(CLOSE_THE_SESSION_FAILED, e2);
      }
    }
  }

  private void cleanSessionAndMayThrowConnectionException(
      ISession session, int times, IoTDBConnectionException e) throws IoTDBConnectionException {
    closeSession(session);
    tryConstructNewSession();
    if (times == FINAL_RETRY) {
      throw new IoTDBConnectionException(
          String.format(
              "retry to execute statement on %s:%s failed %d times: %s",
              host, port, RETRY, e.getMessage()),
          e);
    }
  }
  /**
   * insert the data of a device. For each timestamp, the number of measurements is the same.
   *
   * @param tablet data batch
   */
  @Override
  public void insertTablet(Tablet tablet)
      throws IoTDBConnectionException, StatementExecutionException {
    /*
     *  A Tablet example:
     *        device1
     *     time s1, s2, s3
     *     1,   1,  1,  1
     *     2,   2,  2,  2
     *     3,   3,  3,  3
     *
     * times in Tablet may be not in ascending orde
     */
    insertTablet(tablet, false);
  }

  @Override
  /**
   * insert the data of a device. For each timestamp, the number of measurements is the same.
   *
   * 
Users need to control the count of Tablet and write a batch when it reaches the maxBatchSize
   *
   * @param tablet a tablet data of one device
   * @param sorted whether times in Tablet are in ascending order
   */
  public void insertTablet(Tablet tablet, boolean sorted)
      throws IoTDBConnectionException, StatementExecutionException {
    /*
     *  A Tablet example:
     *        device1
     *     time s1, s2, s3
     *     1,   1,  1,  1
     *     2,   2,  2,  2
     *     3,   3,  3,  3
     */

    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertTablet(tablet, sorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertTablet failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  /**
   * insert the data of a device. For each timestamp, the number of measurements is the same.
   *
   * 
Users need to control the count of Tablet and write a batch when it reaches the maxBatchSize
   *
   * @param tablet a tablet data of one device
   */
  public void insertAlignedTablet(Tablet tablet)
      throws IoTDBConnectionException, StatementExecutionException {
    insertAlignedTablet(tablet, false);
  }
  /**
   * insert the data of a device. For each timestamp, the number of measurements is the same.
   *
   * 
Users need to control the count of Tablet and write a batch when it reaches the maxBatchSize
   *
   * @param tablet a tablet data of one device
   * @param sorted whether times in Tablet are in ascending order
   */
  @Override
  public void insertAlignedTablet(Tablet tablet, boolean sorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedTablet(tablet, sorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedTablet failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }
  /**
   * use batch interface to insert data
   *
   * @param tablets multiple batch
   */
  @Override
  public void insertTablets(Map tablets)
      throws IoTDBConnectionException, StatementExecutionException {
    insertTablets(tablets, false);
  }
  /**
   * use batch interface to insert data
   *
   * @param tablets multiple batch
   */
  @Override
  public void insertAlignedTablets(Map tablets)
      throws IoTDBConnectionException, StatementExecutionException {
    insertAlignedTablets(tablets, false);
  }
  /**
   * use batch interface to insert aligned data
   *
   * @param tablets multiple batch
   */
  @Override
  public void insertTablets(Map tablets, boolean sorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertTablets(tablets, sorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertTablets failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * use batch interface to insert aligned data
   *
   * @param tablets multiple batch
   */
  @Override
  public void insertAlignedTablets(Map tablets, boolean sorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedTablets(tablets, sorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedTablets failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert data in batch format, which can reduce the overhead of network. This method is just like
   * jdbc batch insert, we pack some insert request in batch and send them to server If you want
   * improve your performance, please see insertTablet method
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertRecords(
      List deviceIds,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecords(deviceIds, times, measurementsList, typesList, valuesList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecords failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert aligned data in batch format, which can reduce the overhead of network. This method is
   * just like jdbc batch insert, we pack some insert request in batch and send them to server If
   * you want improve your performance, please see insertTablet method.
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedRecords(
      List multiSeriesIds,
      List times,
      List> multiMeasurementComponentsList,
      List> typesList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedRecords(
            multiSeriesIds, times, multiMeasurementComponentsList, typesList, valuesList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedRecords failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert data that belong to the same device in batch format, which can reduce the overhead of
   * network. This method is just like jdbc batch insert, we pack some insert request in batch and
   * send them to server If you want improve your performance, please see insertTablet method
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecordsOfOneDevice(
            deviceId, times, measurementsList, typesList, valuesList, false);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert data that belong to the same device in batch format, which can reduce the overhead of
   * network. This method is just like jdbc batch insert, we pack some insert request in batch and
   * send them to server If you want improve your performance, please see insertTablet method
   *
   * @see Session#insertTablet(Tablet)
   */
  @Deprecated
  @Override
  public void insertOneDeviceRecords(
      String deviceId,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecordsOfOneDevice(
            deviceId, times, measurementsList, typesList, valuesList, false);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert String format data that belong to the same device in batch format, which can reduce the
   * overhead of network. This method is just like jdbc batch insert, we pack some insert request in
   * batch and send them to server If you want improve your performance, please see insertTablet
   * method
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertStringRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertStringRecordsOfOneDevice(
            deviceId, times, measurementsList, valuesList, false);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertStringRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert data that belong to the same device in batch format, which can reduce the overhead of
   * network. This method is just like jdbc batch insert, we pack some insert request in batch and
   * send them to server If you want improve your performance, please see insertTablet method
   *
   * @param haveSorted whether the times list has been ordered.
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList,
      boolean haveSorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecordsOfOneDevice(
            deviceId, times, measurementsList, typesList, valuesList, haveSorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert data that belong to the same device in batch format, which can reduce the overhead of
   * network. This method is just like jdbc batch insert, we pack some insert request in batch and
   * send them to server If you want improve your performance, please see insertTablet method
   *
   * @param haveSorted whether the times list has been ordered.
   * @see Session#insertTablet(Tablet)
   */
  @Deprecated
  @Override
  public void insertOneDeviceRecords(
      String deviceId,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList,
      boolean haveSorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecordsOfOneDevice(
            deviceId, times, measurementsList, typesList, valuesList, haveSorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert String format data that belong to the same device in batch format, which can reduce the
   * overhead of network. This method is just like jdbc batch insert, we pack some insert request in
   * batch and send them to server If you want improve your performance, please see insertTablet
   * method
   *
   * @param haveSorted whether the times list has been ordered.
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertStringRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> valuesList,
      boolean haveSorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertStringRecordsOfOneDevice(
            deviceId, times, measurementsList, valuesList, haveSorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertStringRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert aligned data that belong to the same device in batch format, which can reduce the
   * overhead of network. This method is just like jdbc batch insert, we pack some insert request in
   * batch and send them to server If you want improve your performance, please see insertTablet
   * method.
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedRecordsOfOneDevice(
            deviceId, times, measurementsList, typesList, valuesList, false);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert aligned data as String format that belong to the same device in batch format, which can
   * reduce the overhead of network. This method is just like jdbc batch insert, we pack some insert
   * request in batch and send them to server If you want improve your performance, please see
   * insertTablet method.
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedStringRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedStringRecordsOfOneDevice(
            deviceId, times, measurementsList, valuesList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedStringRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert aligned data that belong to the same device in batch format, which can reduce the
   * overhead of network. This method is just like jdbc batch insert, we pack some insert request in
   * batch and send them to server If you want improve your performance, please see insertTablet
   * method.
   *
   * @param haveSorted whether the times list has been ordered.
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList,
      boolean haveSorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedRecordsOfOneDevice(
            deviceId, times, measurementsList, typesList, valuesList, haveSorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert aligned data as String format that belong to the same device in batch format, which can
   * reduce the overhead of network. This method is just like jdbc batch insert, we pack some insert
   * request in batch and send them to server If you want improve your performance, please see
   * insertTablet method.
   *
   * @param haveSorted whether the times list has been ordered.
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedStringRecordsOfOneDevice(
      String deviceId,
      List times,
      List> measurementsList,
      List> valuesList,
      boolean haveSorted)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedStringRecordsOfOneDevice(
            deviceId, times, measurementsList, valuesList, haveSorted);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedStringRecordsOfOneDevice failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert data in batch format, which can reduce the overhead of network. This method is just like
   * jdbc batch insert, we pack some insert request in batch and send them to server If you want
   * improve your performance, please see insertTablet method
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertRecords(
      List deviceIds,
      List times,
      List> measurementsList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecords(deviceIds, times, measurementsList, valuesList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecords failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Insert aligned data in batch format, which can reduce the overhead of network. This method is
   * just like jdbc batch insert, we pack some insert request in batch and send them to server If
   * you want improve your performance, please see insertTablet method.
   *
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedRecords(
      List multiSeriesIds,
      List times,
      List> multiMeasurementComponentsList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedRecords(
            multiSeriesIds, times, multiMeasurementComponentsList, valuesList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedRecords failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * insert data in one row, if you want improve your performance, please use insertRecords method
   * or insertTablet method
   *
   * @see Session#insertRecords(List, List, List, List, List)
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertRecord(
      String deviceId,
      long time,
      List measurements,
      List types,
      List values)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecord(deviceId, time, measurements, types, values);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecord failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * insert aligned data in one row, if you want improve your performance, please use
   * insertAlignedRecords method or insertTablet method.
   *
   * @see Session#insertAlignedRecords(List, List, List, List, List)
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedRecord(
      String multiSeriesId,
      long time,
      List multiMeasurementComponents,
      List types,
      List values)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedRecord(multiSeriesId, time, multiMeasurementComponents, types, values);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedRecord failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * insert data in one row, if you want improve your performance, please use insertRecords method
   * or insertTablet method
   *
   * @see Session#insertRecords(List, List, List, List, List)
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertRecord(
      String deviceId, long time, List measurements, List values)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertRecord(deviceId, time, measurements, values);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertRecord failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * insert aligned data in one row, if you want improve your performance, please use
   * insertAlignedRecords method or insertTablet method.
   *
   * @see Session#insertAlignedRecords(List, List, List, List, List)
   * @see Session#insertTablet(Tablet)
   */
  @Override
  public void insertAlignedRecord(
      String multiSeriesId, long time, List multiMeasurementComponents, List values)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.insertAlignedRecord(multiSeriesId, time, multiMeasurementComponents, values);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("insertAlignedRecord failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * This method NOT insert data into database and the server just return after accept the request,
   * this method should be used to test other time cost in client
   */
  @Override
  public void testInsertTablet(Tablet tablet)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.testInsertTablet(tablet);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("testInsertTablet failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * This method NOT insert data into database and the server just return after accept the request,
   * this method should be used to test other time cost in client
   */
  @Override
  public void testInsertTablets(Map tablets)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.testInsertTablets(tablets);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("testInsertTablets failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * This method NOT insert data into database and the server just return after accept the request,
   * this method should be used to test other time cost in client
   */
  @Override
  public void testInsertRecords(
      List deviceIds,
      List times,
      List> measurementsList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.testInsertRecords(deviceIds, times, measurementsList, valuesList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("testInsertRecords failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * This method NOT insert data into database and the server just return after accept the request,
   * this method should be used to test other time cost in client
   */
  @Override
  public void testInsertRecords(
      List deviceIds,
      List times,
      List> measurementsList,
      List> typesList,
      List> valuesList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.testInsertRecords(deviceIds, times, measurementsList, typesList, valuesList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("testInsertRecords failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * This method NOT insert data into database and the server just return after accept the request,
   * this method should be used to test other time cost in client
   */
  @Override
  public void testInsertRecord(
      String deviceId, long time, List measurements, List values)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.testInsertRecord(deviceId, time, measurements, values);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("testInsertRecord failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * This method NOT insert data into database and the server just return after accept the request,
   * this method should be used to test other time cost in client
   */
  @Override
  public void testInsertRecord(
      String deviceId,
      long time,
      List measurements,
      List types,
      List values)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.testInsertRecord(deviceId, time, measurements, types, values);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("testInsertRecord failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * delete a timeseries, including data and schema
   *
   * @param path timeseries to delete, should be a whole path
   */
  @Override
  public void deleteTimeseries(String path)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteTimeseries(path);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteTimeseries failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * delete a timeseries, including data and schema
   *
   * @param paths timeseries to delete, should be a whole path
   */
  @Override
  public void deleteTimeseries(List paths)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteTimeseries(paths);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteTimeseries failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * delete data <= time in one timeseries
   *
   * @param path data in which time series to delete
   * @param time data with time stamp less than or equal to time will be deleted
   */
  @Override
  public void deleteData(String path, long time)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteData(path, time);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteData failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * delete data <= time in multiple timeseries
   *
   * @param paths data in which time series to delete
   * @param time data with time stamp less than or equal to time will be deleted
   */
  @Override
  public void deleteData(List paths, long time)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteData(paths, time);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteData failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * delete data >= startTime and data <= endTime in multiple timeseries
   *
   * @param paths data in which time series to delete
   * @param startTime delete range start time
   * @param endTime delete range end time
   */
  @Override
  public void deleteData(List paths, long startTime, long endTime)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteData(paths, startTime, endTime);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteData failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void setStorageGroup(String storageGroupId)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.setStorageGroup(storageGroupId);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("setStorageGroup failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void deleteStorageGroup(String storageGroup)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteStorageGroup(storageGroup);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteStorageGroup failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void deleteStorageGroups(List storageGroup)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteStorageGroups(storageGroup);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteStorageGroups failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void createTimeseries(
      String path, TSDataType dataType, TSEncoding encoding, CompressionType compressor)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.createTimeseries(path, dataType, encoding, compressor);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("createTimeseries failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void createTimeseries(
      String path,
      TSDataType dataType,
      TSEncoding encoding,
      CompressionType compressor,
      Map props,
      Map tags,
      Map attributes,
      String measurementAlias)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.createTimeseries(
            path, dataType, encoding, compressor, props, tags, attributes, measurementAlias);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("createTimeseries failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void createMultiTimeseries(
      List paths,
      List dataTypes,
      List encodings,
      List compressors,
      List> propsList,
      List> tagsList,
      List> attributesList,
      List measurementAliasList)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.createMultiTimeseries(
            paths,
            dataTypes,
            encodings,
            compressors,
            propsList,
            tagsList,
            attributesList,
            measurementAliasList);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("createMultiTimeseries failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public boolean checkTimeseriesExists(String path)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        boolean resp = session.checkTimeseriesExists(path);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("checkTimeseriesExists failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    // never go here.
    return false;
  }

  @Override
  /**
   * Construct Template at session and create it at server.
   *
   * @see Template
   */
  public void createSchemaTemplate(Template template)
      throws IOException, IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.createSchemaTemplate(template);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("createSchemaTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Create a template with flat measurements, not tree structured. Need to specify datatype,
   * encoding and compressor of each measurement, and alignment of these measurements at once.
   *
   * @oaram templateName name of template to create
   * @param measurements flat measurements of the template, cannot contain character dot
   * @param dataTypes datatype of each measurement in the template
   * @param encodings encodings of each measurement in the template
   * @param compressors compression type of each measurement in the template
   * @param isAligned specify whether these flat measurements are aligned
   */
  @Override
  public void createSchemaTemplate(
      String templateName,
      List measurements,
      List dataTypes,
      List encodings,
      List compressors,
      boolean isAligned)
      throws IOException, IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.createSchemaTemplate(
            templateName, measurements, dataTypes, encodings, compressors, isAligned);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("createSchemaTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * Compatible for rel/0.12, this method will create an unaligned flat template as a result. Notice
   * that there is no aligned concept in 0.12, so only the first measurement in each nested list
   * matters.
   *
   * @param name name of the template
   * @param schemaNames it works as a virtual layer inside template in 0.12, and makes no difference
   *     after 0.13
   * @param measurements the first measurement in each nested list will constitute the final flat
   *     template
   * @param dataTypes the data type of each measurement, only the first one in each nested list
   *     matters as above
   * @param encodings the encoding of each measurement, only the first one in each nested list
   *     matters as above
   * @param compressors the compressor of each measurement
   * @throws IoTDBConnectionException
   * @throws StatementExecutionException
   */
  @Deprecated
  @Override
  public void createSchemaTemplate(
      String name,
      List schemaNames,
      List> measurements,
      List> dataTypes,
      List> encodings,
      List compressors)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.createSchemaTemplate(
            name, schemaNames, measurements, dataTypes, encodings, compressors);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("createSchemaTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void addAlignedMeasurementsInTemplate(
      String templateName,
      List measurementsPath,
      List dataTypes,
      List encodings,
      List compressors)
      throws IOException, IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.addAlignedMeasurementsInTemplate(
            templateName, measurementsPath, dataTypes, encodings, compressors);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("addAlignedMeasurementsInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void addAlignedMeasurementInTemplate(
      String templateName,
      String measurementPath,
      TSDataType dataType,
      TSEncoding encoding,
      CompressionType compressor)
      throws IOException, IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.addAlignedMeasurementInTemplate(
            templateName, measurementPath, dataType, encoding, compressor);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("addAlignedMeasurementInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void addUnalignedMeasurementsInTemplate(
      String templateName,
      List measurementsPath,
      List dataTypes,
      List encodings,
      List compressors)
      throws IOException, IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.addUnalignedMeasurementsInTemplate(
            templateName, measurementsPath, dataTypes, encodings, compressors);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("addUnalignedMeasurementsInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void addUnalignedMeasurementInTemplate(
      String templateName,
      String measurementPath,
      TSDataType dataType,
      TSEncoding encoding,
      CompressionType compressor)
      throws IOException, IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.addUnalignedMeasurementInTemplate(
            templateName, measurementPath, dataType, encoding, compressor);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("addUnalignedMeasurementInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void deleteNodeInTemplate(String templateName, String path)
      throws IOException, IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deleteNodeInTemplate(templateName, path);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("deleteNodeInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public int countMeasurementsInTemplate(String name)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        int resp = session.countMeasurementsInTemplate(name);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("countMeasurementsInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return -1;
  }

  @Override
  public boolean isMeasurementInTemplate(String templateName, String path)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        boolean resp = session.isMeasurementInTemplate(templateName, path);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("isMeasurementInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return false;
  }

  @Override
  public boolean isPathExistInTemplate(String templateName, String path)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        boolean resp = session.isPathExistInTemplate(templateName, path);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("isPathExistInTemplata failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return false;
  }

  @Override
  public List showMeasurementsInTemplate(String templateName)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        List resp = session.showMeasurementsInTemplate(templateName);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("showMeasurementsInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return null;
  }

  @Override
  public List showMeasurementsInTemplate(String templateName, String pattern)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        List resp = session.showMeasurementsInTemplate(templateName, pattern);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("showMeasurementsInTemplate failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return null;
  }

  @Override
  public List showAllTemplates()
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        List resp = session.showAllTemplates();
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("showAllTemplates failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return null;
  }

  @Override
  public List showPathsTemplateSetOn(String templateName)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        List resp = session.showPathsTemplateSetOn(templateName);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("showPathsTemplateSetOn failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return null;
  }

  @Override
  public List showPathsTemplateUsingOn(String templateName)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        List resp = session.showPathsTemplateUsingOn(templateName);
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("showPathsTemplateUsingOn failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return null;
  }

  @Override
  public void setSchemaTemplate(String templateName, String prefixPath)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.setSchemaTemplate(templateName, prefixPath);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn(
            String.format("setSchemaTemplate [%s] on [%s] failed", templateName, prefixPath), e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void unsetSchemaTemplate(String prefixPath, String templateName)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.unsetSchemaTemplate(prefixPath, templateName);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn(
            String.format("unsetSchemaTemplate [%s] on [%s] failed", templateName, prefixPath), e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void createTimeseriesOfTemplateOnPath(String path)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.createTimeseriesOfTemplateOnPath(path);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn(String.format("create timeseries of template on [%s] failed", path), e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void deactivateTempalte(String templateName, String prefixPath)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.deactivateTemplateOn(templateName, prefixPath);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn(
            String.format("Deactivate template [%s] on [%s] failed", templateName, prefixPath), e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @Override
  public void dropSchemaTemplate(String templateName)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.dropSchemaTemplate(templateName);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn(String.format("dropSchemaTemplate [%s] failed", templateName), e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  /**
   * execure query sql users must call closeResultSet(SessionDataSetWrapper) if they do not use the
   * SessionDataSet any more. users do not need to call sessionDataSet.closeOpeationHandler() any
   * more.
   *
   * @param sql query statement
   * @return result set Notice that you must get the result instance. Otherwise a data leakage will
   *     happen
   */
  @SuppressWarnings("squid:S2095") // Suppress wrapper not closed warning
  @Override
  public SessionDataSetWrapper executeQueryStatement(String sql)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        ISessionDataSet resp = session.executeQueryStatement(sql);
        SessionDataSetWrapper wrapper = new SessionDataSetWrapper(resp, session, this);
        occupy(session);
        return wrapper;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("executeQueryStatement failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    // never go here
    return null;
  }

  /**
   * execure query sql users must call closeResultSet(SessionDataSetWrapper) if they do not use the
   * SessionDataSet any more. users do not need to call sessionDataSet.closeOpeationHandler() any
   * more.
   *
   * @param sql query statement
   * @param timeoutInMs the timeout of this query, in milliseconds
   * @return result set Notice that you must get the result instance. Otherwise a data leakage will
   *     happen
   */
  @SuppressWarnings("squid:S2095") // Suppress wrapper not closed warning
  @Override
  public SessionDataSetWrapper executeQueryStatement(String sql, long timeoutInMs)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        ISessionDataSet resp = session.executeQueryStatement(sql, timeoutInMs);
        SessionDataSetWrapper wrapper = new SessionDataSetWrapper(resp, session, this);
        occupy(session);
        return wrapper;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("executeQueryStatement failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    // never go here
    return null;
  }

  /**
   * execute non query statement
   *
   * @param sql non query statement
   */
  @Override
  public void executeNonQueryStatement(String sql)
      throws StatementExecutionException, IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        session.executeNonQueryStatement(sql);
        putBack(session);
        return;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("executeNonQueryStatement failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
  }

  @SuppressWarnings("squid:S2095") // Suppress wrapper not closed warning
  @Override
  public SessionDataSetWrapper executeRawDataQuery(List paths, long startTime, long endTime)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        ISessionDataSet resp = session.executeRawDataQuery(paths, startTime, endTime);
        SessionDataSetWrapper wrapper = new SessionDataSetWrapper(resp, session, this);
        occupy(session);
        return wrapper;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("executeRawDataQuery failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    // never go here
    return null;
  }

  /** Transmit insert record request for OperationSync */
  @Override
  public boolean operationSyncTransmit(ByteBuffer buffer)
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        buffer.position(0);
        session.operationSyncTransmit(buffer);
        putBack(session);
        return true;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (StatementExecutionException | RuntimeException e) {
        putBack(session);
        throw e;
      }
    }

    return false;
  }

  @Override
  public SystemStatus getSystemStatus() throws IoTDBConnectionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        SystemStatus status = session.getSystemStatus();
        putBack(session);
        return status;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return null;
  }

  @Override
  public TSBackupConfigurationResp getBackupConfiguration()
      throws IoTDBConnectionException, StatementExecutionException {
    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        TSBackupConfigurationResp resp = session.getBackupConfiguration();
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (RuntimeException e) {
        putBack(session);
        throw e;
      }
    }
    return null;
  }

  @Override
  public int getMaxSize() {
    return maxSize;
  }

  @Override
  public String getHost() {
    return host;
  }

  @Override
  public int getPort() {
    return port;
  }

  @Override
  public String getUser() {
    return user;
  }

  @Override
  public String getPassword() {
    return password;
  }

  @Override
  public int getFetchSize() {
    return fetchSize;
  }

  @Override
  public ZoneId getZoneId() {
    return zoneId;
  }

  @Override
  public long getWaitToGetSessionTimeoutInMs() {
    return waitToGetSessionTimeoutInMs;
  }

  @Override
  public boolean isEnableCompression() {
    return enableCompression;
  }

  @Override
  public boolean isEnableCacheLeader() {
    return enableCacheLeader;
  }

  @Override
  public int getConnectionTimeoutInMs() {
    return connectionTimeoutInMs;
  }

  @Override
  public TSConnectionInfoResp fetchAllConnections() throws IoTDBConnectionException {

    for (int i = 0; i < RETRY; i++) {
      ISession session = getSession();
      try {
        TSConnectionInfoResp resp = session.fetchAllConnections();
        putBack(session);
        return resp;
      } catch (IoTDBConnectionException e) {
        // TException means the connection is broken, remove it and get a new one.
        logger.warn("fetchAllConnections failed", e);
        cleanSessionAndMayThrowConnectionException(session, i, e);
      } catch (Throwable t) {
        putBack(session);
        throw t;
      }
    }
    return null;
  }

  public static class Builder {

    private String host = Config.DEFAULT_HOST;
    private int port = Config.DEFAULT_PORT;
    private List nodeUrls = null;
    private int maxSize = Config.DEFAULT_SESSION_POOL_MAX_SIZE;
    private String user = Config.DEFAULT_USER;
    private String password = Config.DEFAULT_PASSWORD;
    private int fetchSize = Config.DEFAULT_FETCH_SIZE;
    private long waitToGetSessionTimeoutInMs = 60_000;
    private boolean enableCompression = false;
    private ZoneId zoneId = null;
    private boolean enableCacheLeader = Config.DEFAULT_CACHE_LEADER_MODE;
    private int connectionTimeoutInMs = Config.DEFAULT_CONNECTION_TIMEOUT_MS;

    public Builder host(String host) {
      this.host = host;
      return this;
    }

    public Builder port(int port) {
      this.port = port;
      return this;
    }

    public Builder nodeUrls(List nodeUrls) {
      this.nodeUrls = nodeUrls;
      return this;
    }

    public Builder maxSize(int maxSize) {
      this.maxSize = maxSize;
      return this;
    }

    public Builder user(String user) {
      this.user = user;
      return this;
    }

    public Builder password(String password) {
      this.password = password;
      return this;
    }

    public Builder fetchSize(int fetchSize) {
      this.fetchSize = fetchSize;
      return this;
    }

    public Builder zoneId(ZoneId zoneId) {
      this.zoneId = zoneId;
      return this;
    }

    public Builder waitToGetSessionTimeoutInMs(long waitToGetSessionTimeoutInMs) {
      this.waitToGetSessionTimeoutInMs = waitToGetSessionTimeoutInMs;
      return this;
    }

    public Builder enableCompression(boolean enableCompression) {
      this.enableCompression = enableCompression;
      return this;
    }

    public Builder enableCacheLeader(boolean enableCacheLeader) {
      this.enableCacheLeader = enableCacheLeader;
      return this;
    }

    public Builder connectionTimeoutInMs(int connectionTimeoutInMs) {
      this.connectionTimeoutInMs = connectionTimeoutInMs;
      return this;
    }

    public SessionPool build() {
      if (nodeUrls == null) {
        return new SessionPool(
            host,
            port,
            user,
            password,
            maxSize,
            fetchSize,
            waitToGetSessionTimeoutInMs,
            enableCompression,
            zoneId,
            enableCacheLeader,
            connectionTimeoutInMs);
      } else {
        return new SessionPool(
            nodeUrls,
            user,
            password,
            maxSize,
            fetchSize,
            waitToGetSessionTimeoutInMs,
            enableCompression,
            zoneId,
            enableCacheLeader,
            connectionTimeoutInMs);
      }
    }
  }
}
    

    

    
            
    
            







    
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