activemq实现队列的独有消费

     在我们实际的开发中可能存在这么一种情况,应用程序要向一个队列名为queue的队列中发送3条消息,需要保证这3条消息按顺序消费。必须是第一条消费完,在消费第二条然后是第三条。而我们的程序中可能有时候存在多个consumer对这个队列进行消费,那么可能出现消息时按1,2,3进行消费的,但第二条可能比较耗时,就会导致第2条消息没有消费完,第三条消息就已经消费完了,这个时候可能就会出现问题。

     解决方案:1、使用独有消费者就可以解决这个问题。(在创建队列的时候,向队列后面增加参数 ?consumer.exclusive=true

                        2、使用消息分组也可以进行解决(比上面一种方案好

                        3、本博文使用的是独有消费者进行解决

     场景模拟:向队列中发送3条消费,且在消费第二条消费时,线程沉睡5秒中,程序中启动2个监听对消息进行消费,看消息的消费结果

     队列是属于点对点的模式,且队列中的一条消费只可能被一个消费者进行消费

1、pom文件的配置

<dependency>
	<groupId>org.apache.activemq</groupId>
	<artifactId>activemq-all</artifactId>
	<version>5.11.1</version>
</dependency>
<dependency>
	<groupId>org.apache.activemq</groupId>
	<artifactId>activemq-pool</artifactId>
	<version>5.12.1</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-jms</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-aop</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-beans</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-context</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-context-support</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-core</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-messaging</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-oxm</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-tx</artifactId>
	<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
	<groupId>commons-pool</groupId>
	<artifactId>commons-pool</artifactId>
	<version>1.6</version>
</dependency>

 2、消息监听器一 (消费者一)

public class ExclusiveConsumerListener implements SessionAwareMessageListener<TextMessage> {
	@Override
	public void onMessage(TextMessage message, Session session) throws JMSException {
		String msg = message.getText();
		if (msg.startsWith("2")) {
			try {
				System.out.println(Thread.currentThread().getName() + " 开始沉睡5秒.");
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		System.out.println(Thread.currentThread().getName() + " : " + this.getClass().getName() + " :开始消费消息:" + msg);
	}
}

3、消息监听器二(消费者二)

public class ExclusiveConsumerListener2 implements SessionAwareMessageListener<TextMessage> {
	@Override
	public void onMessage(TextMessage message, Session session) throws JMSException {
		String msg = message.getText();
		if (msg.startsWith("2")) {
			try {
				System.out.println(Thread.currentThread().getName() + " 开始沉睡5秒.");
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		System.out.println(Thread.currentThread().getName() + " : " + this.getClass().getName() + " :开始消费消息:" + msg);
	}
}

 4、配置文件(没有实现消息的独有消费

<bean id="connectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory">
		<property name="connectionFactory">
			<bean class="org.apache.activemq.ActiveMQConnectionFactory">
				<property name="alwaysSyncSend" value="true" />
				<property name="brokerURL" value="tcp://localhost:61616" />
			</bean>
		</property>
		<property name="maxConnections" value="10" />
	</bean>

	<bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
		<property name="connectionFactory" ref="connectionFactory" />
		<property name="defaultDestination" ref="queue" />
		<property name="pubSubDomain" value="false" />
	</bean>

	<bean id="exclusiveConsumerListener" class="com.huan.activemq.独有消费者.ExclusiveConsumerListener" />
	<bean id="exclusiveConsumerListener2" class="com.huan.activemq.独有消费者.ExclusiveConsumerListener2" />
	<bean id="queue" class="org.apache.activemq.command.ActiveMQQueue">
		<constructor-arg name="name" value="spring-queue" />
	</bean>
	<jms:listener-container acknowledge="auto"
		connection-factory="connectionFactory" container-type="default"
		destination-type="queue">
		<jms:listener destination="spring-queue" ref="exclusiveConsumerListener" />
		<jms:listener destination="spring-queue" ref="exclusiveConsumerListener2" />
	</jms:listener-container>

 5、测试

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public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:application-exclusive-consumer.xml");
		JmsTemplate jmsTemplate = ctx.getBean(JmsTemplate.class);
		String msg1 = "1-这是第一条消息";
		String msg2 = "2-这是第二条消息";
		String msg3 = "3-这是第三条消息";
		jmsTemplate.convertAndSend(msg1);
		jmsTemplate.convertAndSend(msg2);
		jmsTemplate.convertAndSend(msg3);
	}

 6、测试结果(可以看到消息是乱的,并没有按照1消费完后消费2,2消费完后消费3)


   

7、修改配置文件(在队列的字符串后面加上?consumer.exclusive=true实现消费的独有消费


  
 8、重新测试(结果为按照顺序消费的

 

 

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转载自huan1993.iteye.com/blog/2383789
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