mule使用jms 进行事务回滚(rollback) 和消息重发(redelivery)
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这个示例演示 使用jms 进行事务(rollback) 和消息重发(redelivery)
JMS报文 在事务中抛出一个异常
示例中报文随即被异常回滚策略组件( Rollback Exception Strategy Component)捕获,回滚并且重新发送相同的报文;回滚四次之后,报文自动发送成功。
- 右键运行示例
启动activMQ,访问http://localhost:8161/admin/send.jsp
发送测试数据- 运行过程中事务会回滚四次,在第五次运行后运行成功。
- 访问http://localhost:8161/admin/topics.jsp
会发现 Messages Enqueued列会增加响应的消息数目
<?xml version="1.0" encoding="UTF-8"?><mule version="EE-3.7.3" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:https="http://www.mulesoft.org/schema/mule/https" xmlns:jbossts="http://www.mulesoft.org/schema/mule/jbossts" xmlns:jms="http://www.mulesoft.org/schema/mule/jms" xmlns:spring="http://www.springframework.org/schema/beans" xmlns:ss="http://www.springframework.org/schema/security" xmlns:test="http://www.mulesoft.org/schema/mule/test" xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:xm="http://www.mulesoft.org/schema/mule/xml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd http://www.mulesoft.org/schema/mule/jbossts http://www.mulesoft.org/schema/mule/jbossts/current/mule-jbossts.xsd http://www.mulesoft.org/schema/mule/https http://www.mulesoft.org/schema/mule/https/current/mule-https.xsd http://www.mulesoft.org/schema/mule/xml http://www.mulesoft.org/schema/mule/xml/current/mule-xml.xsd http://www.mulesoft.org/schema/mule/jms http://www.mulesoft.org/schema/mule/jms/current/mule-jms.xsd http://www.mulesoft.org/schema/mule/test http://www.mulesoft.org/schema/mule/test/current/mule-test.xsd http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd"> <spring:beans> <!-- ActiveMQ --> <spring:bean class="org.apache.activemq.RedeliveryPolicy" id="redeliveryPolicy"> <spring:property name="maximumRedeliveries" value="5" /> <spring:property name="initialRedeliveryDelay" value="5000" /> <spring:property name="redeliveryDelay" value="2000" /> <spring:property name="useExponentialBackOff" value="false" /> <spring:property name="backOffMultiplier" value="2" /> </spring:bean> <spring:bean class="org.apache.activemq.ActiveMQConnectionFactory" id="amqFactory" lazy-init="true"> <!-- 代理url --> <spring:property name="brokerURL" value="failover:(tcp://localhost:61616)" /> <spring:property name="redeliveryPolicy" ref="redeliveryPolicy" /> </spring:bean> </spring:beans> <!-- JMS连接器,用来连接JMS服务器 1.连接工厂 --> <jms:activemq-connector connectionFactory-ref="amqFactory" doc:name="Active MQ" maxRedelivery="5" name="jmsConnector" persistentDelivery="true" specification="1.1" validateConnections="true" /> <flow doc:name="JMSRedeliver" name="JMSRedeliver"> <!-- 定义JMS入口端点从JMS服务器读取消息 --> <jms:inbound-endpoint connector-ref="jmsConnector" doc:name="Listen to JMS queue" queue="in"> <!-- queue 点到点模式时的JMS队列名称,不能和topic同时 使用 --> <jms:transaction action="ALWAYS_BEGIN" /> </jms:inbound-endpoint> <logger doc:name="log message" level="INFO" message="********: #[message.inboundProperties]"/> <logger doc:name="log message" level="INFO" message="********: #[message.inboundProperties['JMSXDeliveryCount']]"/> <choice doc:name="Choice"> <when expression="#[message.inboundProperties['JMSXDeliveryCount']==5]"> <logger doc:name="No exception thrown" level="INFO" message="Transaction without errors" /> </when> <otherwise> <test:component doc:name="Throws custom exception" exceptionToThrow="org.exceptions.MyException" throwException="true" /> </otherwise> </choice> <!-- 定义JMS出口端点向JMS服务器发送消息 --> <jms:outbound-endpoint connector-ref="jmsConnector" doc:name="Send to JMS topic" topic="topic1"> <!-- 发布/订阅模式时JMS的消息主题名称,不能和 queue同时使用 --> <jms:transaction action="ALWAYS_JOIN" /> </jms:outbound-endpoint> <choice-exception-strategy doc:name="Choice Exception Strategy"> <catch-exception-strategy doc:name="Catch Exception Strategy" when="#[!exception.causedBy(org.exceptions.MyException)]"> <logger doc:name="Commit transaction" level="INFO" message="Entered catch exception strategy. The transaction is commited." /> </catch-exception-strategy> <rollback-exception-strategy doc:name="Rollback Exception Strategy" when="#[exception.causedBy(org.exceptions.MyException)]"> <logger doc:name="Rollback transaction" level="INFO" message="Entered rollback exception strategy. The message rolls back to its original state for reprocessing." /> </rollback-exception-strategy> </choice-exception-strategy> </flow></mule>
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