Java tutorial
/* * ************************************************************************************* * Copyright (C) 2006-2015 EsperTech, Inc. All rights reserved. * * http://www.espertech.com/esper * * http://www.espertech.com * * ---------------------------------------------------------------------------------- * * The software in this package is published under the terms of the GPL license * * a copy of which has been included with this distribution in the license.txt file. * * ************************************************************************************* */ package com.espertech.esperio.amqp; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; import com.rabbitmq.client.QueueingConsumer; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.io.IOException; public class AMQPSupportUtil { private static final Log log = LogFactory.getLog(AMQPSupportUtil.class); public static int drainQueue(String hostName, String queueName) { Connection connection = null; Channel channel = null; try { ConnectionFactory factory = new ConnectionFactory(); factory.setHost(hostName); connection = factory.newConnection(); channel = connection.createChannel(); // java.lang.String queue, boolean durable, boolean exclusive, boolean autoDelete, java.util.Map<java.lang.String,java.lang.Object> arguments channel.queueDeclare(queueName, false, false, true, null); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(queueName, true, consumer); int count = 0; while (true) { final QueueingConsumer.Delivery msg = consumer.nextDelivery(1); if (msg == null) { return count; } } } catch (Exception ex) { log.error("Error attaching to AMQP: " + ex.getMessage(), ex); } finally { if (channel != null) { try { channel.close(); } catch (IOException e) { e.printStackTrace(); } } if (connection != null) { try { connection.close(); } catch (IOException e) { e.printStackTrace(); } } } return -1; } }