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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 com.hydraql.thrift;

import com.hydraql.common.exception.HBaseThriftConnectionException;
import com.hydraql.common.exception.HBaseThriftException;
import com.hydraql.common.exception.HBaseThriftExhaustedPoolException;
import org.apache.commons.pool2.PooledObjectFactory;
import org.apache.commons.pool2.impl.GenericObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;

import java.io.Closeable;
import java.util.NoSuchElementException;

/**
 * @author leojie 2020/12/27 2:48 下午
 */
public abstract class Pool implements Closeable {
  protected GenericObjectPool internalPool;

  public Pool() {
  }

  public Pool(final GenericObjectPoolConfig poolConfig, PooledObjectFactory factory) {
    initPool(poolConfig, factory);
  }

  @Override
  public void close() {
    destroy();
  }

  public boolean isClosed() {
    return this.internalPool.isClosed();
  }

  public void initPool(final GenericObjectPoolConfig poolConfig, PooledObjectFactory factory) {
    if (this.internalPool != null) {
      try {
        closeInternalPool();
      } catch (Exception e) {
      }
    }
    this.internalPool = new GenericObjectPool<>(factory, poolConfig);
  }

  public T getResource() {
    try {
      return internalPool.borrowObject();
    } catch (NoSuchElementException nse) {
      if (null == nse.getCause()) {
        // 连接池耗尽
        // The exception was caused by an exhausted pool
        throw new HBaseThriftExhaustedPoolException(
            "Could not get a resource since the pool is exhausted", nse);
      }
      // Otherwise, the exception was caused by the implemented activateObject() or ValidateObject()
      throw new HBaseThriftException("Could not get a resource from the pool", nse);
    } catch (Exception e) {
      throw new HBaseThriftConnectionException("Could not get a resource from the pool", e);
    }
  }

  protected void returnResourceObject(final T resource) {
    if (resource == null) {
      return;
    }
    try {
      internalPool.returnObject(resource);
    } catch (Exception e) {
      throw new HBaseThriftException("Could not return the resource to the pool", e);
    }
  }

  protected void returnBrokenResource(final T resource) {
    if (resource != null) {
      returnBrokenResourceObject(resource);
    }
  }

  protected void returnResource(final T resource) {
    if (resource != null) {
      returnResourceObject(resource);
    }
  }

  public void destroy() {
    closeInternalPool();
  }

  protected void returnBrokenResourceObject(final T resource) {
    try {
      internalPool.invalidateObject(resource);
    } catch (Exception e) {
      throw new HBaseThriftException("Could not return the broken resource to the pool", e);
    }
  }

  protected void closeInternalPool() {
    try {
      internalPool.close();
    } catch (Exception e) {
      throw new HBaseThriftException("Could not destroy the pool", e);
    }
  }

  protected void clearInternalPool() {
    try {
      internalPool.clear();
    } catch (Exception e) {
      throw new HBaseThriftException("Could not clear the pool", e);
    }
  }

  public int getNumActive() {
    if (poolInactive()) {
      return -1;
    }

    return this.internalPool.getNumActive();
  }

  public int getNumIdle() {
    if (poolInactive()) {
      return -1;
    }

    return this.internalPool.getNumIdle();
  }

  public int getNumWaiters() {
    if (poolInactive()) {
      return -1;
    }

    return this.internalPool.getNumWaiters();
  }

  public long getMeanBorrowWaitTimeMillis() {
    if (poolInactive()) {
      return -1;
    }
    return this.internalPool.getMeanBorrowWaitTimeMillis();
  }

  public long getMaxBorrowWaitTimeMillis() {
    if (poolInactive()) {
      return -1;
    }
    return this.internalPool.getMaxBorrowWaitTimeMillis();
  }

  private boolean poolInactive() {
    return this.internalPool == null || this.internalPool.isClosed();
  }

  public void addObjects(int count) {
    try {
      for (int i = 0; i < count; i++) {
        this.internalPool.addObject();
      }
    } catch (Exception e) {
      throw new HBaseThriftException("Error trying to add idle objects", e);
    }
  }

}