/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.phalanx.wire.jms;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import javax.jms.Connection;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import org.smallmind.phalanx.wire.TransportException;
import org.smallmind.scribe.pen.LoggerManager;
public class ConnectionManager implements ExceptionListener {
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
private final ManagedObjectFactory managedObjectFactory;
private final MessagePolicy messagePolicy;
private final ReconnectionPolicy reconnectionPolicy;
private final ConcurrentHashMap<SessionEmployer, Session> sessionMap = new ConcurrentHashMap<>();
private final ConcurrentHashMap<SessionEmployer, MessageProducer> producerMap = new ConcurrentHashMap<>();
private final ConcurrentHashMap<SessionEmployer, MessageConsumer> consumerMap = new ConcurrentHashMap<>();
private Connection connection;
public ConnectionManager (ManagedObjectFactory managedObjectFactory, MessagePolicy messagePolicy, ReconnectionPolicy reconnectionPolicy)
throws TransportException, JMSException {
this.managedObjectFactory = managedObjectFactory;
this.messagePolicy = messagePolicy;
this.reconnectionPolicy = reconnectionPolicy;
createConnection();
}
private void createConnection ()
throws TransportException, JMSException {
if (connection != null) {
try {
connection.stop();
connection.close();
} catch (JMSException jmsException) {
LoggerManager.getLogger(ConnectionManager.class).error(jmsException);
}
}
connection = managedObjectFactory.createConnection();
connection.setExceptionListener(this);
}
public Session getSession (SessionEmployer sessionEmployer)
throws JMSException {
Session session;
lock.readLock().lock();
try {
if ((session = sessionMap.get(sessionEmployer)) == null) {
sessionMap.put(sessionEmployer, session = connection.createSession(false, messagePolicy.getAcknowledgeMode().getJmsValue()));
}
} finally {
lock.readLock().unlock();
}
return session;
}
public MessageProducer getProducer (SessionEmployer sessionEmployer)
throws JMSException {
MessageProducer producer;
lock.readLock().lock();
try {
if ((producer = producerMap.get(sessionEmployer)) == null) {
producerMap.put(sessionEmployer, producer = getSession(sessionEmployer).createProducer(sessionEmployer.getDestination()));
messagePolicy.apply(producer);
}
} finally {
lock.readLock().unlock();
}
return producer;
}
public void createConsumer (SessionEmployer sessionEmployer)
throws JMSException {
lock.readLock().lock();
try {
MessageConsumer consumer;
String selector;
consumerMap.put(sessionEmployer, consumer = (((selector = sessionEmployer.getMessageSelector()) == null) ? getSession(sessionEmployer).createConsumer(sessionEmployer.getDestination()) : getSession(sessionEmployer).createConsumer(sessionEmployer.getDestination(), selector, false)));
consumer.setMessageListener((MessageListener)sessionEmployer);
connection.start();
} finally {
lock.readLock().unlock();
}
}
public void start ()
throws JMSException {
if (connection != null) {
connection.start();
}
}
public void stop ()
throws JMSException {
if (connection != null) {
connection.stop();
}
}
public void close ()
throws JMSException {
if (connection != null) {
for (MessageProducer producer : producerMap.values()) {
producer.close();
}
for (MessageConsumer consumer : consumerMap.values()) {
consumer.close();
}
for (Session session : sessionMap.values()) {
session.close();
}
connection.close();
}
}
@Override
public void onException (JMSException jmsException) {
lock.writeLock().lock();
try {
Exception lastException = null;
boolean success = false;
int reconnectionCount = 0;
LoggerManager.getLogger(ConnectionManager.class).error(jmsException);
while ((!success) && ((reconnectionPolicy.getReconnectionAttempts() < 0) || (reconnectionCount++ < reconnectionPolicy.getReconnectionAttempts()))) {
try {
Thread.sleep(reconnectionPolicy.getReconnectionDelayMilliseconds());
createConnection();
sessionMap.clear();
producerMap.clear();
for (SessionEmployer sessionEmployer : consumerMap.keySet()) {
createConsumer(sessionEmployer);
}
success = true;
} catch (Exception exception) {
lastException = exception;
}
}
if (success) {
LoggerManager.getLogger(ConnectionManager.class).info("Successful reconnection after JMS provider failure");
} else {
TransportException transportException = new TransportException("Unable to reconnect within max attempts(%d)", reconnectionPolicy.getReconnectionAttempts());
LoggerManager.getLogger(ConnectionManager.class).error((lastException != null) ? transportException.initCause(lastException) : transportException);
}
} finally {
lock.writeLock().unlock();
}
}
}