Question

I am trying to use Mule 3.2.0 s Collection Aggregator. I tried using Mule Studio but seems it is still not available in Mule studio for configuration though the icon does appear in the “Flow Control” section.
My use case is –
I get a message from a VM Inbound endpoint. I now want to pass that to 3 different flows – all using the same request object but performing different operations – say A,B,C. All of them update their respective databases but they are all part of a common Order_ID(somethig internal to our application). The 3 processes may take different processing times but once done each of them return the same success response. I want to use an aggregator which will aggregate all these responses without timing out and then forward that to a Java component or another VM Endpoint for further processing.
The Mule documentation for Collection Aggregator doesn’t seem to be very informative so if some one who has used Collection Agg can help me out with the xml config for the above scenario it will be very helpful

Answer 1

Instead of Collection Aggregator use All message processor. It sends the same message to every processor inside it and aggregates the results after they finish.

http://www.mulesoft.org/documentation/display/MULE3USER/Routing+Message+Processors#RoutingMessageProcessors-All

Sample config: (I send “foo” to the vm endpoint)

<flow name="main" processingStrategy="asynchronous">
    <vm:inbound-endpoint path="in"/>
    <all>
        <flow-ref name="flow1"/>
        <flow-ref name="flow2"/>
    </all>

    <logger message="#[payload:]" level="INFO"/>
</flow>

<flow name="flow1">
    <append-string-transformer message="bar1"/>
</flow>

<flow name="flow2">
    <append-string-transformer message="bar2"/>
</flow>

Console output:

INFO  2012-08-15 17:26:01,749 [main.stage1.02] org.mule.api.processor.LoggerMessageProcessor: [foobar1, foobar2]

HTH