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/*
* Copyright 2000-2008, Atomikos (http://www.atomikos.com)
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* 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.
*
*/
package com.atomikos.jdbc.nonxa;
import java.io.PrintWriter;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.naming.NamingException;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.Referenceable;
import javax.naming.StringRefAddr;
import javax.sql.ConnectionEvent;
import javax.sql.ConnectionEventListener;
import javax.sql.DataSource;
import com.atomikos.icatch.HeuristicMessage;
import com.atomikos.icatch.StringHeuristicMessage;
import com.atomikos.jdbc.ConnectionPool;
import com.atomikos.jdbc.HeuristicDataSource;
import com.atomikos.jdbc.XPooledConnection;
/**
*
*
*
* A DataSource implementation that is capable of handling 2-phase commit and
* transactions without requiring XA support from the JDBC drivers of the
* database. Instances can be used to involve non-XA databases in a transaction,
* at the risk of not being able to recover prepared transactions (recovery of
* prepared transactions will result in heuristics).
*
* @deprecated As of release 3.3, the {@link AtomikosNonXADataSourceBean} should be used instead.
*
*/
public class NonXADataSourceImp implements HeuristicDataSource,
ConnectionEventListener, Referenceable
{
private Map previousConnections;
// for each thread, the previously used connection if any
private ConnectionPool pool;
private String jndiName;
private static Map nameToDataSource_ = new HashMap ();
// maps names to DS instances for JNDI lookup helping
/**
* Helper method for JNDI lookup; helps looking up a previously constructed
* instance.
*
* @param name
* The name of the resource.
* @return NonXADataSourceImp The data source, or null if not found.
*/
static NonXADataSourceImp getInstance ( String name )
{
NonXADataSourceImp ret = (NonXADataSourceImp) nameToDataSource_
.get ( name );
return ret;
}
/**
* Add an instance to the map, so that it can be found by name.
*
* @param name
* The name to map on.
* @param instance
* The data source.
* @exception SQLException
* If the name is already in use.
*/
private synchronized static void addToMap ( String name ,
NonXADataSourceImp instance ) throws SQLException
{
if ( nameToDataSource_.get ( name ) != null ) {
throw new SQLException ( "DataSource for resource " + name
+ " already exists!" );
}
nameToDataSource_.put ( name, instance );
}
/**
* Remove a map entry for the given name.
*
* @param name
* The name to unmap.
*/
private synchronized static void removeFromMap ( String name )
{
//test null: quick fix for 20718 (Tomcat classloader problem)
if ( name != null && nameToDataSource_ != null )
nameToDataSource_.remove ( name );
}
/**
* Create a new instance.
*
* @param driver
* The original datasource driver to use. This can be a MySQL,
* for instance. Note: don't use a pooling driver!
* @param jndiName
* The unique global JNDI name to bind this instance on.
* @param user
* The username to get connections for. Empty string or null if
* no user authentication should be used.
* @param password
* The password, null or empty if no user authentication should
* be used.
* @param poolSize
* The size of the connection pool.
* @param connectionTimeout
* The number of seconds after which the pool's connections are
* checked periodically.
* @param testQuery
* A SQL test query to validate connection liveness.
* @param testOnBorrow
* Should connections be tested when gotten?
*
* @throws SQLException
*/
public NonXADataSourceImp ( DataSource driver , String jndiName ,
String user , String password , int poolSize , int connectionTimeout, String testQuery , boolean testOnBorrow )
throws SQLException
{
this ( driver , jndiName , user , password , poolSize ,
connectionTimeout , false, testQuery , testOnBorrow );
}
/**
* Create a new instance.
*
* @param driver
* The original datasource driver to use. This can be a MySQL,
* for instance. Note: don't use a pooling driver!
* @param jndiName
* The unique global JNDI name to bind this instance on.
* @param user
* The username to get connections for. Empty string or null if
* no user authentication should be used.
* @param password
* The password, null or empty if no user authentication should
* be used.
* @param poolSize
* The size of the connection pool.
* @param connectionTimeout
* The number of seconds after which the pool's connections are
* checked periodically.
* @param validation
* True if the instance will be used for validation only. No
* binding is done in that case.
* @param testQuery
* A query to validate connection liveness.
* @param testOnBorrow
* Should connections be tested when gotten?
*
* @throws SQLException
*/
public NonXADataSourceImp ( DataSource driver , String jndiName ,
String user , String password , int poolSize ,
int connectionTimeout , boolean validation, String testQuery , boolean testOnBorrow ) throws SQLException
{
NonXAConnectionFactory factory = new NonXAConnectionFactory ( driver,
user, password );
pool = new ConnectionPool ( poolSize, factory, connectionTimeout, testQuery , testOnBorrow );
previousConnections = new HashMap ();
this.jndiName = jndiName;
if ( !validation )
addToMap ( jndiName, this );
}
/**
* @see com.atomikos.jdbc.HeuristicDataSource#getConnection(java.lang.String)
*/
public Connection getConnection ( String msg ) throws SQLException
{
StringHeuristicMessage hm = new StringHeuristicMessage ( msg );
return getConnection ( hm );
}
/**
* @see com.atomikos.jdbc.HeuristicDataSource#getConnection(java.lang.String,
* java.lang.String, java.lang.String)
*/
public Connection getConnection ( String user , String passwd , String msg )
throws SQLException
{
StringHeuristicMessage hm = new StringHeuristicMessage ( msg );
return getConnection ( user, passwd, hm );
}
/**
* @see com.atomikos.jdbc.HeuristicDataSource#getConnection(com.atomikos.icatch.HeuristicMessage)
*/
public synchronized Connection getConnection ( HeuristicMessage msg )
throws SQLException
{
// ThreadLocalConnection ret = ( ThreadLocalConnection )
// previousConnections.get();
Connection proxy = (Connection) previousConnections.get ( Thread
.currentThread () );
if ( proxy == null ) {
// no previous connection -> get one from pool
NonXAPooledConnectionImp pc = (NonXAPooledConnectionImp) pool
.getPooledConnection ();
pc.addConnectionEventListener ( this );
proxy = (Connection) ThreadLocalConnection.newInstance ( pc );
previousConnections.put ( Thread.currentThread (), proxy );
}
// here we are certain that proxy is not null -> increase the use count
ThreadLocalConnection previous = (ThreadLocalConnection) Proxy
.getInvocationHandler ( proxy );
// if ( previous.isStale() ) System.out.println ( "WARNING: STALE
// CONNECTION STILL MAPPED TO THREAD");
previous.incUseCount ();
previous.addHeuristicMessage ( msg );
return proxy;
}
/**
* @see com.atomikos.jdbc.HeuristicDataSource#getConnection(java.lang.String,
* java.lang.String, com.atomikos.icatch.HeuristicMessage)
*/
public Connection getConnection ( String user , String passwd ,
HeuristicMessage msg ) throws SQLException
{
throw new SQLException (
"Not supported: getConnection with authentication." );
}
/**
* @see javax.sql.DataSource#getConnection()
*/
public Connection getConnection () throws SQLException
{
HeuristicMessage m = null;
return getConnection ( m );
}
public Connection getConnection ( String user , String pw )
throws SQLException
{
HeuristicMessage m = null;
return getConnection ( user, pw, m );
}
/**
* @see javax.sql.DataSource#getLogWriter()
*/
public PrintWriter getLogWriter () throws SQLException
{
return pool.getLogWriter ();
}
/**
* @see javax.sql.DataSource#setLogWriter(java.io.PrintWriter)
*/
public void setLogWriter ( PrintWriter pw ) throws SQLException
{
pool.setLogWriter ( pw );
}
/**
* @see javax.sql.DataSource#setLoginTimeout(int)
*/
public void setLoginTimeout ( int val ) throws SQLException
{
pool.setLoginTimeout ( val );
}
/**
* @see javax.sql.DataSource#getLoginTimeout()
*/
public int getLoginTimeout () throws SQLException
{
return pool.getLoginTimeout ();
}
/**
* @see javax.sql.ConnectionEventListener#connectionClosed(javax.sql.ConnectionEvent)
*/
public synchronized void connectionClosed ( ConnectionEvent event )
{
// called when the Pooled Connection is resubmitted to the pool
// remove ThreadLocal mapping
XPooledConnection source = (XPooledConnection) event.getSource ();
Set values = previousConnections.entrySet ();
Iterator it = values.iterator ();
while ( it.hasNext () ) {
Map.Entry entry = (Map.Entry) it.next ();
Connection c = (Connection) entry.getValue ();
ThreadLocalConnection tlc = (ThreadLocalConnection) Proxy
.getInvocationHandler ( c );
if ( tlc.usesConnection ( source ) ) {
it.remove ();
}
}
source.removeConnectionEventListener ( this );
pool.putBack ( source );
}
/**
* @see javax.sql.ConnectionEventListener#connectionErrorOccurred(javax.sql.ConnectionEvent)
*/
public void connectionErrorOccurred ( ConnectionEvent arg0 )
{
// ignore
}
/**
* Closes the datasource (and shuts down the pool).
*
*/
public void close ()
{
pool.cleanup ();
removeFromMap ( jndiName );
}
/**
* @see Referenceable
*/
public Reference getReference () throws NamingException
{
RefAddr ra = new StringRefAddr ( "ResourceName", jndiName );
Reference ref = new Reference ( getClass ().getName (),
new StringRefAddr ( "name", "NonXADataSourceImp" ),
NonXADataSourceImpFactory.class.getName (), null );
ref.add ( ra );
return ref;
}
}
