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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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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.geode.internal.datasource;

/**
 * This class models a connection pool for non-transactional database connection. Extends the
 * AbstractPoolCache to inherit the pool bahavior.
 * 
 */
import java.sql.SQLException;

import javax.sql.ConnectionEventListener;
import javax.sql.ConnectionPoolDataSource;
import javax.sql.PooledConnection;

import org.apache.logging.log4j.Logger;

import org.apache.geode.i18n.LogWriterI18n;
import org.apache.geode.internal.i18n.LocalizedStrings;
import org.apache.geode.internal.jta.TransactionUtils;
import org.apache.geode.internal.logging.LogService;

public class ConnectionPoolCacheImpl extends AbstractPoolCache {
  private static final Logger logger = LogService.getLogger();

  private static final long serialVersionUID = -3096029291871746431L;

  private ConnectionPoolDataSource m_cpds;

  /**
   * Constructor initializes the ConnectionPoolCacheImpl properties.
   */
  public ConnectionPoolCacheImpl(ConnectionPoolDataSource connectionpooldatasource,
      ConnectionEventListener eventListner, ConfiguredDataSourceProperties configs)
      throws PoolException {
    super(eventListner, configs);
    m_cpds = connectionpooldatasource;
    initializePool();
  }

  /**
   * This method destroys the connection.
   */
  @Override
  void destroyPooledConnection(Object connectionObject) {
    try {
      ((PooledConnection) connectionObject)
          .removeConnectionEventListener((javax.sql.ConnectionEventListener) connEventListner);
      ((PooledConnection) connectionObject).close();
      connectionObject = null;
    } catch (Exception ex) {
      if (logger.isTraceEnabled()) {
        logger.trace(
            "AbstractPoolcache::destroyPooledConnection:Exception in closing the connection.Ignoring it. The exeption is {}",
            ex.getMessage(), ex);
      }
    }
  }

  /**
   * Creates a new connection for the pool.
   * 
   * @return the connection from the database as Object.
   * @throws PoolException
   */
  @Override
  public Object getNewPoolConnection() throws PoolException {
    if (m_cpds != null) {
      PooledConnection poolConn = null;
      try {
        poolConn = m_cpds.getPooledConnection(configProps.getUser(), configProps.getPassword());
      } catch (SQLException sqx) {
        throw new PoolException(
            LocalizedStrings.ConnectionPoolCacheImpl_CONNECTIONPOOLCACHEIMPLGENEWCONNECTION_EXCEPTION_IN_CREATING_NEW_POOLEDCONNECTION
                .toLocalizedString(),
            sqx);
      }
      poolConn.addConnectionEventListener((javax.sql.ConnectionEventListener) connEventListner);
      return poolConn;
    } else {
      if (logger.isDebugEnabled()) {
        logger.debug(
            "ConnectionPoolCacheImpl::geNewConnection: ConnectionPoolCache not intialized with ConnectionPoolDatasource");
      }
      throw new PoolException(
          LocalizedStrings.ConnectionPoolCacheImpl_CONNECTIONPOOLCACHEIMPLGENEWCONNECTION_CONNECTIONPOOLCACHE_NOT_INTIALIZED_WITH_CONNECTIONPOOLDATASOURCE
              .toLocalizedString());
    }
  }
}