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A WireTap component can be used to forward a copy of the input message to a listener in a proxy fashion.
This component implements the WireTap pattern.
It can handle all four standard MEPs, but will only send an In-Only MEP to the listener.
The originating service must be configured to send messages to the WireTap directly.
In the case of an In-Out MEP, this means that the WireTap needs to be configured to send the exchange along to the destination service.

This doc need to be update - it seems that wire tap can also be used to forward fault and out messages.  See also wire tap xml schema

{snippet:id=wire-tap|lang=xml|url=servicemix/smx3/trunk/deployables/serviceengines/servicemix-eip/src/test/resources/org/apache/servicemix/eip/spring.xml}

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<eip:resequencer 
  service="sample:Resequencer"
  endpoint="ResequencerEndpoint"
  comparator="#comparator"
  capacity="100"
  timeout="2000">
  <eip:target>
    <eip:exchange-target service="sample:SampleTarget" />
  </eip:target>
</eip:resequencer>

<!-- Configure default comparator with custom sequence number property -->
<eip:default-comparator id="comparator" sequenceNumberKey="seqnum"/>

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