| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.activemq.pool; |
| |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import javax.jms.JMSException; |
| import javax.jms.Session; |
| |
| import org.apache.activemq.ActiveMQConnection; |
| import org.apache.activemq.transport.TransportListener; |
| import org.apache.commons.pool.ObjectPoolFactory; |
| |
| /** |
| * Holds a real JMS connection along with the session pools associated with it. |
| * |
| * |
| */ |
| public class ConnectionPool { |
| |
| private ActiveMQConnection connection; |
| private Map<SessionKey, SessionPool> cache; |
| private AtomicBoolean started = new AtomicBoolean(false); |
| private int referenceCount; |
| private ObjectPoolFactory poolFactory; |
| private long lastUsed = System.currentTimeMillis(); |
| private long firstUsed = lastUsed; |
| private boolean hasFailed; |
| private boolean hasExpired; |
| private int idleTimeout = 30 * 1000; |
| private long expiryTimeout = 0l; |
| |
| public ConnectionPool(ActiveMQConnection connection, ObjectPoolFactory poolFactory) { |
| this(connection, new HashMap<SessionKey, SessionPool>(), poolFactory); |
| // Add a transport Listener so that we can notice if this connection |
| // should be expired due to |
| // a connection failure. |
| connection.addTransportListener(new TransportListener() { |
| public void onCommand(Object command) { |
| } |
| |
| public void onException(IOException error) { |
| synchronized (ConnectionPool.this) { |
| hasFailed = true; |
| } |
| } |
| |
| public void transportInterupted() { |
| } |
| |
| public void transportResumed() { |
| } |
| }); |
| // |
| // make sure that we set the hasFailed flag, in case the transport already failed |
| // prior to the addition of our new TransportListener |
| // |
| if(connection.isTransportFailed()) { |
| hasFailed = true; |
| } |
| } |
| |
| public ConnectionPool(ActiveMQConnection connection, Map<SessionKey, SessionPool> cache, ObjectPoolFactory poolFactory) { |
| this.connection = connection; |
| this.cache = cache; |
| this.poolFactory = poolFactory; |
| } |
| |
| public void start() throws JMSException { |
| if (started.compareAndSet(false, true)) { |
| try { |
| connection.start(); |
| } catch (JMSException e) { |
| started.set(false); |
| throw(e); |
| } |
| } |
| } |
| |
| public synchronized ActiveMQConnection getConnection() { |
| return connection; |
| } |
| |
| public Session createSession(boolean transacted, int ackMode) throws JMSException { |
| SessionKey key = new SessionKey(transacted, ackMode); |
| SessionPool pool = cache.get(key); |
| if (pool == null) { |
| pool = createSessionPool(key); |
| cache.put(key, pool); |
| } |
| PooledSession session = pool.borrowSession(); |
| return session; |
| } |
| |
| public synchronized void close() { |
| if (connection != null) { |
| try { |
| Iterator<SessionPool> i = cache.values().iterator(); |
| while (i.hasNext()) { |
| SessionPool pool = i.next(); |
| i.remove(); |
| try { |
| pool.close(); |
| } catch (Exception e) { |
| } |
| } |
| } finally { |
| try { |
| connection.close(); |
| } catch (Exception e) { |
| } finally { |
| connection = null; |
| } |
| } |
| } |
| } |
| |
| public synchronized void incrementReferenceCount() { |
| referenceCount++; |
| lastUsed = System.currentTimeMillis(); |
| } |
| |
| public synchronized void decrementReferenceCount() { |
| referenceCount--; |
| lastUsed = System.currentTimeMillis(); |
| if (referenceCount == 0) { |
| expiredCheck(); |
| } |
| } |
| |
| /** |
| * @return true if this connection has expired. |
| */ |
| public synchronized boolean expiredCheck() { |
| if (connection == null) { |
| return true; |
| } |
| if (hasExpired) { |
| if (referenceCount == 0) { |
| close(); |
| } |
| return true; |
| } |
| if (hasFailed |
| || (idleTimeout > 0 && System.currentTimeMillis() > lastUsed + idleTimeout) |
| || expiryTimeout > 0 && System.currentTimeMillis() > firstUsed + expiryTimeout) { |
| hasExpired = true; |
| if (referenceCount == 0) { |
| close(); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| public int getIdleTimeout() { |
| return idleTimeout; |
| } |
| |
| public void setIdleTimeout(int idleTimeout) { |
| this.idleTimeout = idleTimeout; |
| } |
| |
| protected SessionPool createSessionPool(SessionKey key) { |
| return new SessionPool(this, key, poolFactory.createPool()); |
| } |
| |
| public void setExpiryTimeout(long expiryTimeout) { |
| this.expiryTimeout = expiryTimeout; |
| } |
| |
| public long getExpiryTimeout() { |
| return expiryTimeout; |
| } |
| |
| } |