Mule ESB 學習筆記（6）

5.4 異步請求-響應方式

異步請求-響應方式即請求方調用服務後不須要當即得到返回結果，component將請求發送給其餘外圍系統處理（可能有多個），所有處理完畢後經過指定的異步應答Router返回給請求方。

圖 Asynchronous Request-Response

異步請求-響應方式經過在OutBound Endpoint中增長reply-to以及增長async-reply節點實現，響應配置以下：

<flow name="echo">  
    <inbound-endpoint address="http://localhost:7007/services/Echo"  
        exchange-pattern="request-response" />  
    <cxf:jaxws-service serviceClass="demo.mule.umo.Echo" />  
    <component>  
        <singleton-object class="demo.mule.umo.StdIo" />  
    </component>  
    <vm:outbound-endpoint path="vm" exchange-pattern="request-response" />  
</flow>  
<flow name="vm">  
    <vm:inbound-endpoint path="vm" exchange-pattern="request-response" />  
    <component>  
        <singleton-object class="demo.mule.umo.Vm" />  
    </component>  
    <stdio:outbound-endpoint system="OUT" exchange-pattern="one-way" />  
</flow>

異步請求-響應方式適用於請求須要被多個遠程服務並行處理，結果須要彙總處理後返回的場景。

注：上述代碼未運行經過，queue1和queue2得到了請求消息並正常處理，但返回至async-reply時拋出異常，暫未定位到問題。

後將collection-async-reply-router改成single-async-reply-router未報異常，代碼示例以下：

<service name="async req-rep"> <inbound> <stdio:inbound-endpoint ref="stdioInEndpoint" /> </inbound> <component class="demo.mule.umo.Echo" /> <outbound> <multicasting-router> <vm:outbound-endpoint path="async.queue1" exchange-pattern="one-way" /> <vm:outbound-endpoint path="async.queue2" exchange-pattern="one-way" /> <reply-to address="vm://reply" /> </multicasting-router> </outbound> <async-reply timeout="5000" failOnTimeout="true"> <vm:inbound-endpoint path="reply" exchange-pattern="one-way" /> <single-async-reply-router /> </async-reply> </service>

等有空看看collection-async-reply-router吧，或者自定義router。

 

to be continued...