使用与RabbitMQ的Spring集成

时间:2012-04-27 13:53:11

标签: rabbitmq amqp spring-integration

我正在为我们的某个应用程序开发消息传递接口。该应用程序是一种服务,旨在接受“作业”,进行一些处理,并返回结果(实际上以文件的形式)。

我们的想法是使用RabbitMQ作为消息传递基础架构,使用Spring AMQP来处理协议特定的细节。

我不希望从我的代码到Spring AMQP紧密耦合,所以我想使用Spring Integration隐藏消息api。基本上我想要这个:

发送给RabbitMQ的消息====> Spring AMQP ====> Spring Integration ====>我的服务====>回复一直回到RabbitMQ

我正在尝试将所需的XML配置计算在一起,但我遇到了多层抽象和不同术语的问题。找到一个在Spring AMQP / RabbitMQ之上演示Spring Integration的工作示例已经证明是非常困难的,尽管这种设置对我来说是非常“最佳实践”。

1)那么......有些精彩的灵魂可以快速看一下这个并且可能会让我朝着正确的方向前进吗?我需要什么,不需要什么? : - )

2)理想情况下,队列应该是多线程的,这意味着taskExecutor应该将多条消息传递给我的jobService以进行并行处理。需要什么配置?

 <?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:util="http://www.springframework.org/schema/util"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:rabbit="http://www.springframework.org/schema/rabbit"
    xmlns:int="http://www.springframework.org/schema/integration"
    xmlns:int-amqp="http://www.springframework.org/schema/integration/amqp"
    xmlns:int-stream="http://www.springframework.org/schema/integration/stream"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
    http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
    http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
    http://www.springframework.org/schema/integration/amqp http://www.springframework.org/schema/integration/amqp/spring-integration-amqp.xsd
    http://www.springframework.org/schema/integration/stream http://www.springframework.org/schema/integration/stream/spring-integration-stream.xsd
    ">

    <context:component-scan base-package="com.myprogram.etc" />

    <!-- Messaging infrastructure: RabbitMQ -->

    <bean id="connectionFactory" class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="${ei.messaging.amqp.servername}" />
        <property name="username" value="${ei.messaging.amqp.username}" />
        <property name="password" value="${ei.messaging.amqp.password}" />
    </bean>

    <rabbit:connection-factory id="connectionFactory" />

    <rabbit:admin connection-factory="connectionFactory"/>

    <!-- From RabbitMQ -->

    <int-amqp:inbound-gateway request-channel="fromAMQP" reply-channel="toAMQP" queue-names="our-product-name-queue" connection-factory="connectionFactory"/>

    <!-- Spring Integration configuration -->

    <int:channel id="fromAMQP">
        <!-- Is this necessary?? -->
        <int:queue/>
    </int:channel>

    <!-- JobService is a @Service with a @ServiceActivator annotation -->
    <int:service-activator input-channel="fromAMQP" ref="jobService"/>
</beans>

1 个答案:

答案 0 :(得分:6)

对于弹簧集成和spring-integration-amqp来说,我和你一样,我怀疑,但是我确实得到了一些基于一个示例项目的工作。

对于rabbitmq基础设施,我有以下内容:

<rabbit:connection-factory id="rabbitConnectionFactory"/>

<rabbit:template id="amqpTemplate" connection-factory="rabbitConnectionFactory"/>

<rabbit:admin connection-factory="rabbitConnectionFactory"/>

<!-- some attributes seemed to be ok with queue name, others required id
  -- so I used both with the same value -->
<rabbit:queue id='test.queue' name='test.queue'/>

<rabbit:direct-exchange name:"my.exchange">
    <rabbit:bindings>
        <rabbit:binding queue="test.queue" key="test.binding"/>
    </rabbit:bindings>
</rabbit:direct-exchange>

要向rabbitmq发送消息,我有以下内容:

<!-- This is just an interface definition, no implementation required
  -- spring will generate an implementation which puts a message on the channel -->
<int:gateway id="backgroundService", 
         service-interface="com.company.BackgroundService"
             default-request-channel="toRabbit"

<int:channel id:"toRabbit"/>

<!-- used amqpTemplate to send messages on toRabbit channel to rabbitmq -->
<int-amqp:outbound-channel-adapter channel:"toRabbit" 
                               amqp-template="amqpTemplate" 
                   exchange-name="my.exchange" 
                   routing-key="test.binding"/>

要接收消息,我有以下内容:

<int:service-activator input-channel="fromRabbit" 
                       ref="testService" 
                       method="serviceMethod"/>


// from rabbitmq to local channel
<int-amqp:inbound-channel-adapter channel="fromRabbit" 
                                  queue-names="test.queue" 
                                  connection-factory="rabbitConnectionFactory"/>

<int:channel id="fromRabbit"/>

一些警告 - spring-integration中的amqp集成文档说可以同步发送和接收返回值,但我还没想到。当我的service-activator方法返回一个值时,它会引发异常抛出,将消息放回rabbitmq(并生成一个无限循环,因为它会再次接收消息并再次抛出异常)。

我的BackgroundService interfacde如下所示:

package com.company

import org.springframework.integration.annotation.Gateway

public interface BackgroundService {

    //@Gateway(requestChannel="someOtherMessageChannel")
    public String sayHello(String toWho)

}

如果您不想使用spring bean中配置的默认通道,可以通过注释在每个方法上指定一个通道。

附加到服务激活器的服务如下所示:

package com.company;

class TestService {

    public void serviceMethod(String param) {
    log.info("serviceMethod received: " + param");
    //return "hello, " + param;
    }
}

当我在没有涉及rabbitmq的情况下将所有内容连接到本地时,调用者正确接收了返回值。当我访问rabbitmq频道时,在返回值后抛出异常时,我得到了前面提到的无限循环。它肯定是可能的,否则就不可能在不修改代码的情况下在不同的通道中连接,但我不确定这个技巧是什么。如果你想出来,请回答一个解决方案。显然,您可以根据需要在端点之间放置任何路由,转换和过滤。

如果上面的XML摘录中存在拼写错误,请不要感到惊讶。我不得不从groovy DSL转换回xml,所以我本可以犯错误。但意图应该足够明确。