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MysqlPooledConnection.java
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Tue, Aug 20, 21:21

MysqlPooledConnection.java
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/*
Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc.jdbc2.optional;
import java.lang.reflect.Constructor;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.sql.ConnectionEvent;
import javax.sql.ConnectionEventListener;
import javax.sql.PooledConnection;
import com.mysql.jdbc.ExceptionInterceptor;
import com.mysql.jdbc.SQLError;
import com.mysql.jdbc.Util;
/**
* This class is used to wrap and return a physical connection within a logical handle. It also registers and notifies ConnectionEventListeners of any
* ConnectionEvents
*/
public class MysqlPooledConnection implements PooledConnection {
private static final Constructor<?> JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR;
static {
if (Util.isJdbc4()) {
try {
JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR = Class.forName("com.mysql.jdbc.jdbc2.optional.JDBC4MysqlPooledConnection")
.getConstructor(new Class[] { com.mysql.jdbc.Connection.class });
} catch (SecurityException e) {
throw new RuntimeException(e);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
} else {
JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR = null;
}
}
protected static MysqlPooledConnection getInstance(com.mysql.jdbc.Connection connection) throws SQLException {
if (!Util.isJdbc4()) {
return new MysqlPooledConnection(connection);
}
return (MysqlPooledConnection) Util.handleNewInstance(JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR, new Object[] { connection },
connection.getExceptionInterceptor());
}
/**
* The flag for an exception being thrown.
*/
public static final int CONNECTION_ERROR_EVENT = 1;
/**
* The flag for a connection being closed.
*/
public static final int CONNECTION_CLOSED_EVENT = 2;
private Map<ConnectionEventListener, ConnectionEventListener> connectionEventListeners;
private Connection logicalHandle;
private com.mysql.jdbc.Connection physicalConn;
private ExceptionInterceptor exceptionInterceptor;
/**
* Construct a new MysqlPooledConnection and set instance variables
*
* @param connection
* physical connection to db
*/
public MysqlPooledConnection(com.mysql.jdbc.Connection connection) {
this.logicalHandle = null;
this.physicalConn = connection;
this.connectionEventListeners = new HashMap<ConnectionEventListener, ConnectionEventListener>();
this.exceptionInterceptor = this.physicalConn.getExceptionInterceptor();
}
/**
* Adds ConnectionEventListeners to a hash table to be used for notification
* of ConnectionEvents
*
* @param connectioneventlistener
* listener to be notified with ConnectionEvents
*/
public synchronized void addConnectionEventListener(ConnectionEventListener connectioneventlistener) {
if (this.connectionEventListeners != null) {
this.connectionEventListeners.put(connectioneventlistener, connectioneventlistener);
}
}
/**
* Removes ConnectionEventListeners from hash table used for notification of
* ConnectionEvents
*
* @param connectioneventlistener
* listener to be removed
*/
public synchronized void removeConnectionEventListener(ConnectionEventListener connectioneventlistener) {
if (this.connectionEventListeners != null) {
this.connectionEventListeners.remove(connectioneventlistener);
}
}
/**
* Invoked by the container. Return a logicalHandle object that wraps a
* physical connection.
*
* @see java.sql.DataSource#getConnection()
*/
public synchronized Connection getConnection() throws SQLException {
return getConnection(true, false);
}
protected synchronized Connection getConnection(boolean resetServerState, boolean forXa) throws SQLException {
if (this.physicalConn == null) {
SQLException sqlException = SQLError.createSQLException("Physical Connection doesn't exist", this.exceptionInterceptor);
callConnectionEventListeners(CONNECTION_ERROR_EVENT, sqlException);
throw sqlException;
}
try {
if (this.logicalHandle != null) {
((ConnectionWrapper) this.logicalHandle).close(false);
}
if (resetServerState) {
this.physicalConn.resetServerState();
}
this.logicalHandle = ConnectionWrapper.getInstance(this, this.physicalConn, forXa);
} catch (SQLException sqlException) {
callConnectionEventListeners(CONNECTION_ERROR_EVENT, sqlException);
throw sqlException;
}
return this.logicalHandle;
}
/**
* Invoked by the container (not the client), and should close the physical
* connection. This will be called if the pool is destroyed or the
* connectionEventListener receives a connectionErrorOccurred event.
*
* @see java.sql.DataSource#close()
*/
public synchronized void close() throws SQLException {
if (this.physicalConn != null) {
this.physicalConn.close();
this.physicalConn = null;
}
if (this.connectionEventListeners != null) {
this.connectionEventListeners.clear();
this.connectionEventListeners = null;
}
}
/**
* Notifies all registered ConnectionEventListeners of ConnectionEvents.
* Instantiates a new ConnectionEvent which wraps sqlException and invokes
* either connectionClose or connectionErrorOccurred on listener as
* appropriate.
*
* @param eventType
* value indicating whether connectionClosed or
* connectionErrorOccurred called
* @param sqlException
* the exception being thrown
*/
protected synchronized void callConnectionEventListeners(int eventType, SQLException sqlException) {
if (this.connectionEventListeners == null) {
return;
}
Iterator<Map.Entry<ConnectionEventListener, ConnectionEventListener>> iterator = this.connectionEventListeners.entrySet().iterator();
ConnectionEvent connectionevent = new ConnectionEvent(this, sqlException);
while (iterator.hasNext()) {
ConnectionEventListener connectioneventlistener = iterator.next().getValue();
if (eventType == CONNECTION_CLOSED_EVENT) {
connectioneventlistener.connectionClosed(connectionevent);
} else if (eventType == CONNECTION_ERROR_EVENT) {
connectioneventlistener.connectionErrorOccurred(connectionevent);
}
}
}
protected ExceptionInterceptor getExceptionInterceptor() {
return this.exceptionInterceptor;
}
}

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