001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.pool;
018
019import javax.jms.JMSException;
020
021import org.apache.activemq.ActiveMQConnection;
022import org.apache.activemq.ActiveMQSession;
023import org.apache.activemq.AlreadyClosedException;
024import org.apache.activemq.util.JMSExceptionSupport;
025import org.apache.commons.pool.ObjectPool;
026import org.apache.commons.pool.PoolableObjectFactory;
027
028/**
029 * Represents the session pool for a given JMS connection.
030 * 
031 * 
032 */
033public class SessionPool implements PoolableObjectFactory {
034    private ConnectionPool connectionPool;
035    private SessionKey key;
036    private ObjectPool sessionPool;
037
038    public SessionPool(ConnectionPool connectionPool, SessionKey key, ObjectPool sessionPool) {
039        this.connectionPool = connectionPool;
040        this.key = key;
041        this.sessionPool = sessionPool;
042        sessionPool.setFactory(this);
043    }
044
045    public void close() throws Exception {
046        if (sessionPool != null) {
047            sessionPool.close();
048        }
049        sessionPool = null;
050    }
051
052    public PooledSession borrowSession() throws JMSException {
053        try {
054            Object object = getSessionPool().borrowObject();
055            return (PooledSession)object;
056        } catch (JMSException e) {
057            throw e;
058        } catch (Exception e) {
059            throw JMSExceptionSupport.create(e);
060        }
061    }
062
063    public void returnSession(PooledSession session) throws JMSException {
064        // lets check if we are already closed
065        getConnection();
066        try {
067            getSessionPool().returnObject(session);
068        } catch (Exception e) {
069            throw JMSExceptionSupport.create("Failed to return session to pool: " + e, e);
070        }
071    }
072    
073    public void invalidateSession(PooledSession session) throws JMSException {
074        try {
075            getSessionPool().invalidateObject(session);
076        } catch (Exception e) {
077            throw JMSExceptionSupport.create("Failed to invalidate session: " + e, e);
078        }
079    }
080         
081
082    // PoolableObjectFactory methods
083    // -------------------------------------------------------------------------
084    public Object makeObject() throws Exception {
085        return new PooledSession(createSession(), this);
086    }
087
088    public void destroyObject(Object o) throws Exception {
089        PooledSession session = (PooledSession)o;
090        session.getInternalSession().close();
091    }
092
093    public boolean validateObject(Object o) {
094        return true;
095    }
096
097    public void activateObject(Object o) throws Exception {
098    }
099
100    public void passivateObject(Object o) throws Exception {
101    }
102
103    // Implemention methods
104    // -------------------------------------------------------------------------
105    protected ObjectPool getSessionPool() throws AlreadyClosedException {
106        if (sessionPool == null) {
107            throw new AlreadyClosedException();
108        }
109        return sessionPool;
110    }
111
112    protected ActiveMQConnection getConnection() throws JMSException {
113        return connectionPool.getConnection();
114    }
115
116    protected ActiveMQSession createSession() throws JMSException {
117        return (ActiveMQSession)getConnection().createSession(key.isTransacted(), key.getAckMode());
118    }
119
120}