The document discusses composite sources in Mule ESB, which allow listening to multiple channels for incoming messages. A composite source is a collection of inbound endpoints that listen for requests on different endpoints, and a message received on any endpoint will trigger the flow. Composite sources can be used when a business expects messages from multiple sources like files, web services, JMS, FTP, etc. and the same business process is defined for handling each message. The document provides an XML example of a composite source configuration and explains how to create a Mule flow with a composite source dragging connectors under it to receive messages from different sources like HTTP, file, and JMS.

1. Ankit Lawaniya
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2.  Composite source is a scope available with mule ESB which listens
to multiple channels for incoming messages.
 Composite source is nothing but when multiple inbound
endpoints are configures to listen to the request or work as a
message source. Composite source is collections of inbound
endpoint which listen for the request on the different endpoint
and when any of the inbound endpoint receives a message it
trigger the flow.
 We can have n endpoints which is configured as composite source
and ready to accept messages on any inbound-endpoint.
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3.  To accept incoming messages from multiple input channels, place
two or more message sources (also known as receivers) into a
Composite Source. A message entering the Composite Source on
any supported channel triggers the processing flow.
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4.  There can be a case where business is expecting the message to
receive from the multiple sources. For example, you can receive
business orders from various customers and everyone has to send
a message through different channels like File Share, Web Service
or REST Call, JMS, FTP or SFTP, etc. But the way of handling or
business process defined for each customer is same, so we can use
the Composite source in such a case.
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5. <composite-source>
<file:inbound-endpoint ... />
<http:inbound-endpoint ... />
<jms:inbound-endpoint… />
</composite-source>
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6. Let's walk through how to use Composite source with Mule Flow.
First search for Composite source in Mule Palette and drag and drop
it to the source region of flow.
Now, drag and drop the File connector in message processor region.
Whenever an incoming message is received by any listener, it will pass
to next processor. In this case, the message will be passed to File
connector in message processor region.
Now we can drag and drop multiple connectors under composite
source (i.e. wrap the multiple connectors with Composite source).
Here, we will use one HTTP Listener, one File Connector as inbound
endpoints and one JMS(ActiveMQ) endpoint to receive messages from
different sources. In this application we are using choice flow control
and based on the inbound properties of the inbound endpoint we are
dynamically routing the messages.
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9. Thanks and Keep Learning..
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