Java tutorial
/* * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * WSO2 Inc. 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.wso2.siddhi.extension.output.transport.jms.util; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.io.IOException; import java.util.Properties; import javax.jms.QueueConnectionFactory; import javax.jms.TopicConnectionFactory; import javax.naming.Context; import javax.naming.InitialContext; import javax.naming.NamingException; /** * Consumes JMS messages on either topics or queues. */ public class JMSClient implements Runnable { private static Log log = LogFactory.getLog(JMSClient.class); private String broker, topic, queue; public JMSClient(String broker, String topic, String queue) { this.broker = broker; this.topic = topic; this.queue = queue; } public void listen() throws InterruptedException { Properties properties = new Properties(); try { if ("qpid".equalsIgnoreCase(broker)) { properties.load(ClassLoader.getSystemClassLoader().getResourceAsStream("qpid.properties")); } else if ("activemq".equalsIgnoreCase(broker)) { properties.load(ClassLoader.getSystemClassLoader().getResourceAsStream("activemq.properties")); } else if ("mb".equalsIgnoreCase(broker)) { properties.load(ClassLoader.getSystemClassLoader().getResourceAsStream("mb.properties")); } else { log.error("Entered broker is invalid! "); } if (topic != null && topic.isEmpty() || topic.equals("\"\"")) { topic = null; } if (queue != null && queue.isEmpty() || queue.equals("\"\"")) { queue = null; } if (topic == null && queue == null) { log.error("Enter topic value or queue value! "); } else if (topic != null) { Context context = new InitialContext(properties); TopicConnectionFactory topicConnectionFactory = (TopicConnectionFactory) context .lookup("ConnectionFactory"); TopicConsumer topicConsumer = new TopicConsumer(topicConnectionFactory, topic); Thread consumerThread = new Thread(topicConsumer); log.info("Starting" + broker + "consumerTopic thread..."); consumerThread.start(); Thread.sleep(1 * 60000); log.info("Shutting down " + broker + " consumerTopic..."); topicConsumer.shutdown(); } else { Context context = new InitialContext(properties); QueueConnectionFactory queueConnectionFactory = (QueueConnectionFactory) context .lookup("ConnectionFactory"); QueueConsumer queueConsumer = new QueueConsumer(queueConnectionFactory, queue); Thread consumerThread = new Thread(queueConsumer); log.info("Starting" + broker + "consumerQueue thread..."); consumerThread.start(); Thread.sleep(1 * 60000); log.info("Shutting down " + broker + " consumerQueue..."); queueConsumer.shutdown(); } } catch (IOException e) { log.error("Cannot read properties file from resources. " + e.getMessage(), e); } catch (NamingException e) { log.error("Invalid properties in the properties " + e.getMessage(), e); } } @Override public void run() { try { listen(); } catch (InterruptedException e) { log.error("Error starting the JMS consumer: ", e); } } }