Activemq队列已满向消息发送端发送通知

最近公司准备用Activemq进行消息的通知，并且是request-reply模式的，遇到一个问题：在生产者向队列发送消息的时候，如果队列满了，则需要向生产者发送一个消息通知，从而尽快给用户一个答复，免得耽误时间，由于本人从未接触过Activemq，只能一边学习，一边实践了。今天终于做出来了，将重要代码贴在此地，以免忘记。

applicationContext.xml的内容：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-2.5.xsd"><context:annotation-config /><context:component-scan base-package="****.******.***" /><bean id="prefetchPolicy" class="org.apache.activemq.ActiveMQPrefetchPolicy"><property name="queuePrefetch" value="1" /></bean><!-- get ConnectionFctory from URI:tcp://localhost:61616 --><bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory"><constructor-arg value="tcp://localhost:61616" /><property name="alwaysSyncSend" value="true" /><property name="producerWindowSize" value="0" /><property name="prefetchPolicy" ref="prefetchPolicy" /></bean><bean id="pooledConnectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"destroy-method="stop"><property name="connectionFactory" ref="connectionFactory" /><property name="maxConnections" value="10" /><property name="maximumActiveSessionPerConnection" value="10" /><property name="expiryTimeout" value="10" /><property name="idleTimeout" value="0" /><!-- <property name="timeBetweenExpirationCheckMillis" value="50" /> --></bean><bean id="classPathResource" class="org.springframework.core.io.ClassPathResource"><constructor-arg value="activemq.xml" /></bean><bean id="brokerFactory" class="org.apache.activemq.xbean.BrokerFactoryBean"><constructor-arg ref="classPathResource" /><property name="start" value="true" /></bean><!-- queue for module demo --><bean id="queueDm" class="org.apache.activemq.command.ActiveMQQueue"><property name="physicalName" value="queueDm" /></bean><!-- N多 --><!-- <bean id="amqServer1" class="****.******.****.demo.amq.AMQServer" destroy-method="stop"> --><!-- <constructor-arg index="0" ref="pooledConnectionFactory" />connection factory --><!-- <constructor-arg index="1" ref="queueDm" />queue --><!-- <constructor-arg index="2" value="20" />thread core pool size --><!-- <constructor-arg index="3" value="30000" />thread pool thread keep alive time --><!-- <constructor-arg index="4" value="30" />concurrent task number --><!-- </bean> --><bean id="amqClient" class="****.******.****.demo.amq.AMQClient" scope="prototype"><property name="pooledConnectionFactory" ref="pooledConnectionFactory" /><property name="adminQueue" ref="queueDm" /></bean><bean id="mbeanchecker" class="test.****.******.****.demo.amq.MBeanChecker" /><bean id="messagesender" class="test.****.******.****.demo.amq.MessageSender"><property name="client" ref="amqClient" /></bean></beans>

activemq.xml配置文件内容：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:amq="http://activemq.apache.org/schema/core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.0.xsdhttp://activemq.apache.org/schema/corehttp://activemq.apache.org/schema/core/activemq-core.xsd"><!-- 定义了一个Broker，就是一个ActiveMQ的实例 --><amq:broker brokerName="demoBroker"xmlns="http://activemq.apache.org/schema/core" useJmx="true"persistent="false"><amq:managementContext><amq:managementContext connectorPort="6161"jmxDomainName="demoBrokerContext" connectorPath="/jmxrmi" /></amq:managementContext><amq:systemUsage><amq:systemUsage sendFailIfNoSpace="true"><amq:tempUsage><amq:tempUsage limit="0kb" /></amq:tempUsage><amq:memoryUsage><amq:memoryUsage limit="10kb" /></amq:memoryUsage><amq:storeUsage><amq:storeUsage limit="0kb" /></amq:storeUsage></amq:systemUsage></amq:systemUsage><amq:destinationPolicy><amq:policyMap><amq:policyEntries><amq:policyEntry queue="queueDm" useCache="false"memoryLimit="10kb" producerFlowControl="true"><amq:pendingQueuePolicy><amq:vmQueueCursor /></amq:pendingQueuePolicy></amq:policyEntry></amq:policyEntries></amq:policyMap></amq:destinationPolicy><amq:transportConnectors><transportConnector uri="tcp://localhost:61616" /></amq:transportConnectors></amq:broker></beans>

消息生产者AMQClient.java代码：

package ****.******.****.demo.amq;import java.util.Date;import java.util.UUID;import javax.jms.DeliveryMode;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.Message;import javax.jms.MessageConsumer;import javax.jms.MessageListener;import javax.jms.MessageProducer;import javax.jms.ObjectMessage;import javax.jms.Session;import org.apache.activemq.command.ActiveMQQueue;import org.apache.activemq.jms.pool.PooledSession;import org.apache.activemq.pool.PooledConnection;import org.apache.activemq.pool.PooledConnectionFactory;public class AMQClient implements MessageListener {private PooledConnectionFactory pooledConnectionFactory;public PooledConnectionFactory getPooledConnectionFactory() {return pooledConnectionFactory;}public void setPooledConnectionFactory(PooledConnectionFactory pooledConnectionFactory) {this.pooledConnectionFactory = pooledConnectionFactory;}private ActiveMQQueue adminQueue;private MessageProducer producer;private MessageConsumer consumer;private Destination tempDest;public ActiveMQQueue getAdminQueue() {return adminQueue;}public void setAdminQueue(ActiveMQQueue adminQueue) {this.adminQueue = adminQueue;}private PooledConnection pConnection;private PooledSession pSession;public void start() throws JMSException {pConnection = (PooledConnection) pooledConnectionFactory.createConnection();pConnection.start();pSession = (PooledSession) pConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);producer = pSession.createProducer(adminQueue);producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);tempDest = pSession.createTemporaryQueue();consumer = pSession.createConsumer(tempDest);consumer.setMessageListener(this);}public void stop() throws JMSException {producer.close();consumer.close();pSession.close();pConnection.close();}public void request(String request) throws JMSException {start();System.out.println("Requesting: " + request);ObjectMessage objectMessage = pSession.createObjectMessage();objectMessage.setObject(request);objectMessage.setJMSReplyTo(tempDest);objectMessage.setJMSTimestamp(new Date().getTime());String correlationId = UUID.randomUUID().toString();objectMessage.setJMSCorrelationID(correlationId);producer.send(objectMessage);}@Overridepublic void onMessage(Message message) {try {System.out.println(((ObjectMessage)message).getObject());} catch (JMSException e) {System.out.println(e.getMessage());}}}

查看队列信息的工具类：MBeanChecker.java

package test.****.******.****.demo.amq;import javax.management.MBeanServerConnection;import javax.management.MBeanServerInvocationHandler;import javax.management.ObjectName;import javax.management.remote.JMXConnector;import javax.management.remote.JMXConnectorFactory;import javax.management.remote.JMXServiceURL;import org.apache.activemq.broker.jmx.BrokerViewMBean;import org.apache.activemq.broker.jmx.QueueViewMBean;public class MBeanChecker {public MBeanChecker() {new Thread() {public void run() {try {Thread.sleep(20000);for (int i = 0; i < 10000; i++) {Thread.sleep(1200);check();}} catch (Exception e) {e.printStackTrace();}}; }.start();}private void check() throws Exception {JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:6161/jmxrmi");JMXConnector connector = JMXConnectorFactory.connect(url, null);connector.connect();MBeanServerConnection connection = connector.getMBeanServerConnection();// 需要注意的是，这里的my-broker必须和定义broker的时候的名称相同/** * org.apache.activemq:BrokerName=localhost,Type=Broker * 中的BrokerName与Type必须首字小写 * org.apache.activemq:brokerName=localhost,type=Broker 大写小敏感。。 */ObjectName name = new ObjectName("demoBrokerContext:brokerName=demoBroker,type=Broker");BrokerViewMBean mBean = (BrokerViewMBean) MBeanServerInvocationHandler.newProxyInstance(connection, name, BrokerViewMBean.class, true);System.out.println(mBean.getBrokerName());for (ObjectName queueName : mBean.getQueues()) {QueueViewMBean queueMBean = (QueueViewMBean) MBeanServerInvocationHandler.newProxyInstance(connection, queueName, QueueViewMBean.class, true);System.out.println("\n------------------------------\n");// States for queueSystem.out.println("消息队列名称： --- " + queueMBean.getName());// SizeSystem.out.println("队列中剩余的消息数目： --- " + queueMBean.getQueueSize());// Number of consumers:System.out.println("消费者数目： --- " + queueMBean.getConsumerCount());// Number of dequeue:System.out.println("出队列数目： ---" + queueMBean.getDequeueCount());}}public static void main(String[] args) {}}

测试发送消息的类：MessageSender.java

package test.****.******.****.demo.amq;import javax.jms.JMSException;import org.springframework.web.context.ContextLoader;import ****.******.****.demo.amq.AMQClient;public class MessageSender {private AMQClient client;public AMQClient getClient() {return client;}public void setClient(AMQClient client) {this.client = client;}public MessageSender() {new Thread() {public void run() {try {Thread.sleep(20000);} catch (InterruptedException e) {e.printStackTrace();}sendRequest();};}.start();}private void sendRequest() {for (int i = 0; i < 5000; i++) {try {Thread.sleep(200);} catch (InterruptedException e1) {e1.printStackTrace();}try {AMQClient client = (AMQClient) ContextLoader.getCurrentWebApplicationContext().getBean("amqClient");client.request("TEST-REQUEST:" + i);System.out.println("测试端发送消息: TEST-REQUEST:" + i);} catch (JMSException e) {System.err.println("jzf的发送端获取到的错误信息====================================" + e.getMessage());break;}}}public static void main(String[] args) {}}