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/*
* Copyright (c) 2002, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* 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, version 2.0,
* 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.cj.jdbc;
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 javax.sql.StatementEvent;
import javax.sql.StatementEventListener;
import com.mysql.cj.Messages;
import com.mysql.cj.exceptions.ExceptionInterceptor;
import com.mysql.cj.jdbc.exceptions.SQLError;
/**
* 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 {
protected static MysqlPooledConnection getInstance(com.mysql.cj.jdbc.JdbcConnection connection) throws SQLException {
return new MysqlPooledConnection(connection);
}
/**
* 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 connectionEventListeners;
private Connection logicalHandle;
private com.mysql.cj.jdbc.JdbcConnection physicalConn;
private ExceptionInterceptor exceptionInterceptor;
private final Map statementEventListeners = new HashMap<>();
/**
* Construct a new MysqlPooledConnection and set instance variables
*
* @param connection
* physical connection to db
*/
public MysqlPooledConnection(com.mysql.cj.jdbc.JdbcConnection connection) {
this.logicalHandle = null;
this.physicalConn = connection;
this.connectionEventListeners = new HashMap<>();
this.exceptionInterceptor = this.physicalConn.getExceptionInterceptor();
}
@Override
public synchronized void addConnectionEventListener(ConnectionEventListener connectioneventlistener) {
if (this.connectionEventListeners != null) {
this.connectionEventListeners.put(connectioneventlistener, connectioneventlistener);
}
}
@Override
public synchronized void removeConnectionEventListener(ConnectionEventListener connectioneventlistener) {
if (this.connectionEventListeners != null) {
this.connectionEventListeners.remove(connectioneventlistener);
}
}
@Override
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(Messages.getString("MysqlPooledConnection.0"), 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.
*/
@Override
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;
}
this.statementEventListeners.clear();
}
/**
* 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> 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;
}
@Override
public void addStatementEventListener(StatementEventListener listener) {
synchronized (this.statementEventListeners) {
this.statementEventListeners.put(listener, listener);
}
}
@Override
public void removeStatementEventListener(StatementEventListener listener) {
synchronized (this.statementEventListeners) {
this.statementEventListeners.remove(listener);
}
}
void fireStatementEvent(StatementEvent event) throws SQLException {
synchronized (this.statementEventListeners) {
for (StatementEventListener listener : this.statementEventListeners.keySet()) {
listener.statementClosed(event);
}
}
}
}
