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/*
* 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.qpid.example.publisher;
import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;
import org.apache.qpid.example.shared.Statics;
import javax.jms.*;
import java.util.Properties;
/**
* Class that sends heartbeat messages to allow monitoring of message consumption
* Sends regular (currently 20 seconds apart) heartbeat message
*/
public class MonitorMessageDispatcher {
private static final Logger _logger = Logger.getLogger(MonitorMessageDispatcher.class);
private static MonitorPublisher _monitorPublisher = null;
private static final String DEFAULT_MONITOR_PUB_NAME = "MonitorPublisher";
public static void main(String[] args)
{
//@TODO switch on logging appropriately at your app level
BasicConfigurator.configure();
try
{
while(true)
{
try
{
//endlessly publish messages to monitor queue
publish();
if (_logger.isDebugEnabled())
{
_logger.debug("Dispatched monitor message");
}
//sleep for twenty seconds and then publish again - change if appropriate
Thread.sleep(20000);
}
catch(UndeliveredMessageException a)
{
//@TODO trigger application specific failure handling here
_logger.error("Problem delivering monitor message");
break;
}
}
}
catch(Exception e)
{
System.err.println("Error trying to dispatch AMS monitor message: " + e);
System.exit(1);
}
finally
{
if (getMonitorPublisher() != null)
{
getMonitorPublisher().cleanup();
}
}
System.exit(1);
}
//Publish heartbeat message
public static void publish() throws JMSException, UndeliveredMessageException
{
//Send the message generated from the payload using the _publisher
getMonitorPublisher().sendImmediateMessage
(MessageFactory.createSimpleEventMessage(getMonitorPublisher().getSession(),"monitor:" +System.currentTimeMillis()));
}
//cleanup publishers
public static void cleanup()
{
if (getMonitorPublisher() != null)
{
getMonitorPublisher().cleanup();
}
if (getMonitorPublisher() != null)
{
getMonitorPublisher().cleanup();
}
}
//Returns a _publisher for the monitor queue
private static MonitorPublisher getMonitorPublisher()
{
if (_monitorPublisher != null)
{
return _monitorPublisher;
}
//Create _publisher using system properties
Properties props = System.getProperties();
//Create a _publisher using failover details and constant for monitor queue
_monitorPublisher = new MonitorPublisher();
_monitorPublisher.setName(MonitorMessageDispatcher.DEFAULT_MONITOR_PUB_NAME);
return _monitorPublisher;
}
}
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