如何在 Mule XA 事务中为 ActiveMQ 启用 RedeliveryDelay

Question

我在 Mule 中有一个非常简单的流程，它侦听 ActiveMQ 队列，如果来自队列的消息包含字符串“fail”，则会引发异常。没有 XA 事务，一切正常。消息在 5 秒后重新发送，下一次在几秒钟后发送。在 5 次重新传递后，消息被移至死信队列。

对于 XA 事务，消息会立即重新传递 5 次，然后移动到死信队列。如何告诉 Mule 或 ActiveMQ 等待 RedeliveryDelay？

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:scripting="http://www.mulesoft.org/schema/mule/scripting"
    xmlns:jbossts="http://www.mulesoft.org/schema/mule/jbossts" xmlns:jms="http://www.mulesoft.org/schema/mule/jms"
    xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
    xmlns:spring="http://www.springframework.org/schema/beans" version="CE-3.6.1"
    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-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.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/jbossts http://www.mulesoft.org/schema/mule/jbossts/current/mule-jbossts.xsd
http://www.mulesoft.org/schema/mule/scripting http://www.mulesoft.org/schema/mule/scripting/current/mule-scripting.xsd">

    <spring:beans>

        <!-- Redelivery Policy -->
        <spring:bean id="redeliveryPolicy" class="org.apache.activemq.RedeliveryPolicy">
            <spring:property name="maximumRedeliveries" value="5" />
            <spring:property name="initialRedeliveryDelay" value="5000" />
            <spring:property name="redeliveryDelay" value="5000" />
            <spring:property name="useExponentialBackOff" value="true" />
            <spring:property name="backOffMultiplier" value="1.5" />
        </spring:bean>

        <!-- ActiveMQ Connection factory -->
        <spring:bean id="amqXAFactory"
            class="org.apache.activemq.ActiveMQXAConnectionFactory" lazy-init="true"
            name="amqXAFactory">
            <spring:property name="brokerURL"
                value="tcp://localhost:61616" />
            <spring:property name="redeliveryPolicy" ref="redeliveryPolicy" />
        </spring:bean>

    </spring:beans>

    <jbossts:transaction-manager doc:name="JBoss Transaction Manager">
        <property key="com.arjuna.ats.arjuna.coordinator.defaultTimeout"
            value="47" /><!-- this is in seconds -->
        <property key="com.arjuna.ats.arjuna.coordinator.txReaperTimeout"
            value="108000" /><!-- this is in milliseconds -->
    </jbossts:transaction-manager>

    <jms:activemq-connector name="Active_MQconnectorMessages"
        specification="1.1" validateConnections="true" doc:name="Active MQ for XA"
        persistentDelivery="true" connectionFactory-ref="amqXAFactory"
        numberOfConsumers="1" maxRedelivery="5">
        <reconnect-forever frequency="10000" />
    </jms:activemq-connector>

    <flow name="xatestFlow">
        <jms:inbound-endpoint queue="xa.test" doc:name="JMS"
            connector-ref="Active_MQconnectorMessages">
            <xa-transaction action="ALWAYS_BEGIN" />
        </jms:inbound-endpoint>
        <logger message="Message from queue: #[payload]" level="INFO"
            doc:name="Logger" />
        <scripting:component doc:name="fail if payload contains fail">
            <scripting:script engine="Groovy"><![CDATA[if (payload.contains("fail")) {
  throw new IllegalArgumentException("Failed...")
}
]]></scripting:script>
        </scripting:component>
        <logger message="Message is ready" level="INFO" doc:name="Logger" />
    </flow>
</mule>

Answer 1

花了一些时间，但我找到了解决方案。有两种配置，ActiveMQ中的服务器端和客户端。

在客户端 redeliveryPolicy 中，我将 maximumRedeliveries 更改为 0。在服务器上，我在 activemq.xml 中创建了 redeliveryPlugin：

    <broker ....>
    ......
    <plugins>
        <redeliveryPlugin fallbackToDeadLetter="true" sendToDlqIfMaxRetriesExceeded="true">
            <redeliveryPolicyMap>
                <redeliveryPolicyMap>
                    <redeliveryPolicyEntries>
                        <!-- a destination specific policy -->
                        <redeliveryPolicy 
                            queue="amm.input.to.router" maximumRedeliveries="3" 
                            redeliveryDelay="7000"
                            initialRedeliveryDelay="5000"
                            useCollisionAvoidance="true"
                            />
                    </redeliveryPolicyEntries>

                    <!-- the fallback policy for all other destinations -->
                    <defaultEntry>
                        <redeliveryPolicy
                            maximumRedeliveries="4"
                            useExponentialBackOff="true"
                            initialRedeliveryDelay="10000"
                            redeliveryDelay="5000"
                            useCollisionAvoidance="true"
                            backOffMultiplier="1.5"
                            maximumRedeliveryDelay="93600000" />
                    </defaultEntry>
                </redeliveryPolicyMap>
            </redeliveryPolicyMap>
        </redeliveryPlugin>
    </plugins>

    </broker>

现在是 ActiveMQ 服务器负责重新交付，而不是客户端。

见http://activemq.apache.org/message-redelivery-and-dlq-handling.html