MuleSoft ESB Routes first-successful Routers (Flow Controls in Anypoint Studio) route messages to various destinations in a Mule flow using First Successful.

1. MuleSoft ESB
Routers - First Successful
By
AKASH PRAJAPATI

2. Topics :
•Routers (Flow Controls in Anypoint Studio) route messages to various destinations in a Mule flow.
Pre-requisites :
•Basic under standing of Mule ESB
•JDK 1.8 or above
•Anypoint Studio v 6.0.0 or above
•Mule Server v 3.8.0 EE or above
Purpose:
•Routers (Flow Controls in Anypoint Studio) route messages to various destinations in a Mule flow using First Successful.

3. - 3 -
First Successful :
Sends a message to the next message processor within a "circular" list of processor targets.
The First Successful message processor iterates through its list of child message processors, routing a received message to each of
them in order until one processes the message successfully. If none succeed, an exception is thrown.
Success is defined as:
If the child message processor throws an exception, this is a failure.
Otherwise:
• If the child message processor returns a message that contains an exception payload, this is a failure.
• If the child message processor returns a message that does not contain an exception payload, this is a success.
• If the child message processor does not return a message (e.g. is a one-way connector), this is a success.
First Successful – Routes :

4. Flows :
1 2
<context:property-placeholder location="prop-dev.properties"/>
<http:listener-config name="HTTP_Listener_Configuration" host="${env.prop.hostname}" port="${env.prop.post}" doc:name="HTTP Listener Configuration“ />
<http:request-config name="HTTP_Request_Configuration_A" host="${env.prop.hostname}" port="${env.prop.post}" doc:name="HTTP Request Configuration" />
<http:request-config name="HTTP_Request_Configuration_B" host="${env.prop.hostname}" port="${env.prop.post}" doc:name="HTTP Request Configuration" />
<http:request-config name="HTTP_Request_Configuration_C" host="${env.prop.hostname}" port="${env.prop.post}" doc:name="HTTP Request Configuration" />

5. - 5 -
Flows : 1
<flow name="labsessionFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/labsession" doc:name="HTTP"/>
<logger message="******************* START OF FLOW *******************" level="INFO" doc:name="Logger"/>
<set-payload value="#[message.inboundProperties.'http.query.params'.name]" doc:name="Set Payload"/>
<append-string-transformer message=", Welcome...!!!" doc:name="Append String"/>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
<logger message="******************* END OF FLOW *******************" level="INFO" doc:name="Logger"/>
</flow>
URL : http://localhost:9091/labsession?name=<<YourName>>

6. Flow : 2
<flow name="firstSuccessfulFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/catalog" doc:name="HTTP"/>
<logger message="#['Start of flow']" level="INFO" doc:name="Logger"/>
<set-payload value="#['Set Payload - Replay Webservice Flow']" doc:name="Set Payload"/>
<first-successful doc:name="First Successful">
<http:request config-ref="HTTP_Request_Configuration_A" path="/labsession1?name=Param1" method="GET" doc:name="HTTP" />
<http:request config-ref="HTTP_Request_Configuration_B" path="/labsession2?name=Param2" method="GET" doc:name="HTTP" />
<http:request config-ref="HTTP_Request_Configuration_C" path="/labsession?name=Akash" method="GET" doc:name="HTTP" />
<logger message="#['--- In First Successful ---']" level="INFO" doc:name="Logger"/>
</first-successful>
<set-payload doc:name="Set Payload" value="#[payload]"/>
<logger message="#['End of flow' + payload ]" level="INFO" doc:name="Logger"/>
</flow>
URL : http://localhost:9091/catalog

7. Logger Information:
Steps:
(*) Run URL : http://localhost:9091/catalog
(*) Validate Log and Payload values
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