xasessionpool.java

Jencks是一个轻量级的JCA容器。它可以轻松部署到Spring中以提供消息驱动的POJOs.此外Jencks通过使用类似于JMS,JAX-RPC,JBI与JCA CCI的API来提供对inboun

/** 
 * Licensed 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.jencks.pool;

import javax.jms.JMSException;
import javax.jms.XAConnection;
import javax.jms.XASession;

import org.apache.commons.pool.PoolableObjectFactory;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class XASessionPool implements PoolableObjectFactory
{
  private static final Log log = LogFactory.getLog(XASessionPool.class);
  
  private XAConnection connection;
  private ObjectPool sessionPool;

  public XASessionPool(final XAConnection connection)
  {
    this(connection, new GenericObjectPool(null, -1));
  }

  public XASessionPool(final XAConnection connection,
                       final ObjectPool sessionPool)
  {
    this.connection = connection;
    this.sessionPool = sessionPool;
    sessionPool.setFactory(this);
  }

  public PooledSpringXASession borrowSession() throws JMSException
  {
    try {
      if(log.isDebugEnabled()) log.debug("---->>>>> BORROWING JMS SESSION FROM POOL...");
      Object object = sessionPool.borrowObject();
      if(log.isDebugEnabled()) log.debug("---->>>>> BORROWED SESSION: " + object);
      return (PooledSpringXASession) object;
    }
    catch (JMSException e) {
      throw e;
    }
    catch (Exception e) {
      final JMSException jmsException = new JMSException("Unhandled exception");
      jmsException.initCause(e);
      throw jmsException;
    }
  }
  
  

  // PoolableObjectFactory methods
  //-------------------------------------------------------------------------
  public Object makeObject() throws Exception
  {
    if(log.isDebugEnabled()) log.debug("---->>>>> CREATING NEW SESSION TO SATISFY REQUEST!!");
    return new PooledSpringXASession(createSession(), sessionPool);
  }

  public void destroyObject(Object o) throws Exception
  {
    if(log.isDebugEnabled()) log.debug("---->>>>> DESTROYING SESSION AND PERMANENTLY REMOVING FROM POOL: " + o);
    PooledSpringXASession session = (PooledSpringXASession) o;
    session.getActualSession().close();
  }

  public boolean validateObject(Object o)
  {
    return true;
  }

  public void activateObject(Object o) throws Exception
  {
  }

  public void passivateObject(Object o) throws Exception
  {
    if(log.isDebugEnabled()) log.debug("---->>>>> SESSION HAS BEEN RETURNED TO POOL: " + o);
  }

  // Implemention methods
  //-------------------------------------------------------------------------
  protected XAConnection getConnection() throws JMSException
  {
    if (this.connection == null) {
      throw new JMSException("Already closed");
    }
    return connection;
  }

  protected XASession createSession() throws JMSException
  {
    return getConnection().createXASession();
  }


}