阿帕奇骆驼得到码头的空响应

Question

I face a complex case. What I'm doing is as following steps:

1) <from uri="jetty:http://0.0.0.0:30100/jetty/test"/>

2) <to uri="hazelcast-client:master-test-series" />

3) <to uri="bean:modelSeriesWrapperTest" />

4)

 <split parallelProcessing="true" streaming="true"> <simple>${body}</simple> <to uri="direct:dw.model.test"/> </split> 

5) From another route

 <from uri="direct:dw.model.test"/> <aggregate strategyRef="myAggregatorStrategy" completionTimeout="1000"> <correlationExpression> <constant>true</constant> </correlationExpression> <marshal ref="modelSeriesVariantColourGson" /> <camel:to uri="file:src/data/catask/output?fileName=output.xml"/> </aggregate> 

The problem is that the jetty response is empty. I use TCP trace to track the request and response, the Content-Length is 0. But the output.xml file has correct JSON format content. Even I cross the <camel:to uri="file:src/data/catask/output?fileName=output.xml"/> . The jetty response is still empty.

I try the InOut pattern, it doesn't work as well. It seems jetty return directly, not waiting split done. I try to set In and Out body, it doesn't work either. I Google every case that I can image. There is no helpful case. Could you please help me? Thank you very much.

Answer 1

If you want the jetty response to include whatever information from your aggregator, then you must use the splitter only approach as documented at:

• http://camel.apache.org/composed-message-processor.html

The splitter has built-in aggregation, and that ensures when the splitter is done, it aggregates also, and then you can use that as the jetty response.

When you use <aggregate> then it becomes a separate exchange. To understand this more then read more about the aggregate eip, and other SO, and in various Camel books etc.