Java tutorial
/* * * 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.airavata.gfac.monitor.impl.push.amqp; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; import com.rabbitmq.client.QueueingConsumer; import org.apache.airavata.common.utils.Constants; import org.apache.airavata.common.utils.ServerSettings; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.List; public class SimpleJobFinishConsumer { private final static Logger logger = LoggerFactory.getLogger(SimpleJobFinishConsumer.class); private List<String> completedJobsFromPush; public SimpleJobFinishConsumer(List<String> completedJobsFromPush) { this.completedJobsFromPush = completedJobsFromPush; } public void listen() { try { String queueName = ServerSettings.getSetting(Constants.GFAC_SERVER_PORT, "8950"); String uri = "amqp://localhost"; ConnectionFactory connFactory = new ConnectionFactory(); connFactory.setUri(uri); Connection conn = connFactory.newConnection(); logger.info("--------Created the connection to Rabbitmq server successfully-------"); final Channel ch = conn.createChannel(); logger.info("--------Created the channel with Rabbitmq server successfully-------"); ch.queueDeclare(queueName, false, false, false, null); logger.info("--------Declare the queue " + queueName + " in Rabbitmq server successfully-------"); final QueueingConsumer consumer = new QueueingConsumer(ch); ch.basicConsume(queueName, consumer); (new Thread() { public void run() { try { while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); logger.info( "---------------- Job Finish message received:" + message + " --------------"); synchronized (completedJobsFromPush) { completedJobsFromPush.add(message); } ch.basicAck(delivery.getEnvelope().getDeliveryTag(), false); } } catch (Exception ex) { logger.error("--------Cannot connect to a RabbitMQ Server--------", ex); } } }).start(); } catch (Exception ex) { logger.error("Cannot connect to a RabbitMQ Server: ", ex); logger.info("------------- Push monitoring for HPC jobs is disabled -------------"); } } }