Description of Scatter-Gather

1. Scatter - gather
Flow Control Strategy

2. Route MessageS in a Mule flow
 Scatter-Gather is one of the flow controls that don’t change the payload
 It sends the message to each route concurrently and returns a collection of all
results
 It is often used with the Combine Collections transformers

3. Example of scatter gather use
 The Scatter-Gather router sends a message for
concurrent processing to all configured routes.
 The thread executing the flow that owns the
router waits until all routes complete or time
out.
 If there are no failures, Mule aggregates the
results from each of the routes into a message
collection (MessageCollection class).
 Failure in one route does not stop the Scatter-
Gather from sending messages to its other
configured routes, so it is possible that many, or
all routes may fail concurrently.

4. Configuration XML
<flow name=«FlowName">
<scatter-gather doc:name="Scatter-Gather">
<processor-chain>
<flow-ref name=“Flow1Name" doc:name=" Flow1Name "/>
<filter ref=" FilterName " doc:name=" FilterName "/>
</processor-chain>
<processor-chain>
<flow-ref name="Flow2Name " doc:name=" Flow2Name "/>
<filter ref=«FilterName" doc:name=" FilterName "/>
</processor-chain>
<processor-chain>
<flow-ref name=" Flow3Name " doc:name=" Flow3Name "/>
<filter ref=" FilterName " doc:name=" FilterName "/>
</processor-chain>
</scatter-gather>
</flow>