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mission,
* please contact 3710167@qq.com.
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* Copyright 1999 (C) Exoffice Technologies Inc. All Rights Reserved.
*
* $Id: XADataSourceImpl.java,v 1.2 2002/04/21 03:03:46 mark_matthews Exp $
*/
package com.
mysql.jdbc.xa;
import java.io.Serializable;
import java.io.PrintWriter;
import java.util.Hashtable;
import java.util.Vector;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
import javax.
sql.PooledConnection;
import javax.sql.ConnectionPoolDataSource;
import javax.sql.XAConnection;
import javax.sql.XADataSource;
import javax.transaction.xa.Xid;
/**
* Implements a JDBC 2.0 {@link XADataSource} for any JDBC driver
* with JNDI persistance support. The base implementation is actually
* provided by a different {@link DataSource} class; although this is
* the super class, it only provides the pooling and XA specific
* implementation.
*
*
* @author <a href="3710167@qq.com">Assaf Arkin</a>
* @version 1.0
*/
public abstract class XADataSourceImpl
implements DataSource, Serializable, Runnable {
/**
* Maps underlying JDBC connections into global transaction Xids.
*/
private transient Hashtable _txConnections = new Hashtable();
/**
* This is a pool of free underlying JDBC connections. If two
* XA connections are used in the same transaction, the second
* one will make its underlying JDBC connection available to
* the pool. This is not a real connection pool, only a marginal
* efficiency solution for dealing with shared transactions.
*/
private transient ArrayList _pool = new ArrayList();
/**
* A background deamon thread terminating connections that have
* timed out.
*/
private transient Thread _background;
/**
* The default timeout for all new transactions.
*/
private int _txTimeout = DEFAULT_TX_TIMEOUT;
/**
* The default timeout for all new transactions is 10 seconds.
*/
public final static int DEFAULT_TX_TIMEOUT = 10;
/**
* Implementation details:
* If two XAConnections are associated with the same transaction
* (one with a start the other with a join) they must use the
* same underlying JDBC connection. They lookup the underlying
* JDBC connection based on the transaction's Xid in the
* originating XADataSource.
*
* Currently the XADataSource must be the exact same object,
* this should be changed so all XADataSources that are equal
* share a table of all enlisted connections
*
* To test is two connections should fall under the same
* transaction we match the resourc