Question

我想开发一个流程，可以让我对外部系统进行查询，这可能需要很长时间才能返回。我可能必须查询列表中的多个值。我正在使用一个直到成功的范围来解决问题。不幸的是，即使请求运行了几次，失败的记录也永远不会被放入死信队列中。以下是我尝试解决问题的方法：

    <!-- Dead Letter Queue for exhausted attempts-->
    <vm:endpoint name="DLQ" path="DLQ_VM" doc:name="VM"/>

    <flow name="StartFlow" processingStrategy="synchronous">
        <!--Place a list of String errors to query for on this vm -->
         <vm:inbound-endpoint path="request-processing-queue" " 
                        exchange-pattern="one-way" doc:name="VM"/>
          <vm:outbound-endpoint path="reprocessing-queue" 
                        exchange-pattern="request-response" doc:name="VM"/>
          <logger level="INFO" message="Data returned is #[payload]"/>
          <catch-exception-strategy>
             <logger level="ERROR"  message="Failure During Processing"/>
           </catch-exception-strategy>
    </flow>



   <flow name="RetryingProcess">
       <vm:inbound-endpoint name="reprocessing-vm" exchange-
                                               pattern="request-response" 
                                path="reprocessing-queue" doc:name="VM"/>
       <foreach collection="#[payload]" doc:name="For Each">
            <vm:outbound-endpoint path="by-singles-vm"  exchange-
                            pattern="request-response"/>
       </foreach>
   </flow>


        <flow name="query-retry">
          <vm:inbound-endpoint path="by-singles-vm" exchange-
    pattern="request-response" doc:name="VM"/>
          <until-successful objectStore-ref="objectStore"
                      failureExpression="#[groovy:(exception &amp;&amp; 
                 exception in com.trion.CustomException)
                                         ||!(payload instanceof 
                  com.trion.QueryResult])]"
                      maxRetries="5"
                      millisBetweenRetries="300000"
                      deadLetterQueue-ref="DLQ_VM" doc:name="Until 
                                                      Successful">
                  <vm:outbound-endpoint path="try-again-vm" exchange-
            pattern="request-response" doc:name="VM"/>
          </until-successful>
        </flow>
    <flow name="GetQueryValue" >
           <vm:inbound-endpoint path="try-again-vm" exchange-
           pattern="request-response" doc:name="VM"/>
           <flow-ref name="QueryRequest" />
    </flow>

 <!-- This never happens, i.e. the results are not put here... after retying 
                         -->
   <flow name="AttemptsExceededProcessing">
    <inbound-endpoint ref="DLQ_VM" doc:name="Generic"/>
    <logger level="DEBUG" message="Entering Final Destination Queue with 
       payload is #[payload]"/>
   </flow>

    <!-- Here I have a query to the external system... >
    <flow name="QueryRequest">
      ...... Makes the long running query Here..
     //returns com.trion.QueryResult
      </flow>
  </mule>

请帮忙！

Answer 1

配置没有问题。我有一个millisSecondsBetweenRetry值设置得那么小，我没有看到日志消息，并认为它没有工作。

直到成功处理长时间运行的查询中的对象列表不起作用

1 个答案: