This document discusses how to use a processor chain in Mule applications. A processor chain allows messages to be processed sequentially by a linear series of message processors. The example shown defines a flow with an HTTP listener that contains a processor chain with three loggers to demonstrate the message being processed at each step.

1. How to use Processor Chain
06-06-2015

2. Abstract
• The main motto of this PPT is How to use
Processor Chain in our applications.

3. Introduction
• A Processor Chain is a linear chain of message
processors which process a message in order.
A Processor Chain can be configured wherever
a message processor appears in a Mule
Schema.

4. Example

5. .mflow
• <?xml version="1.0" encoding="UTF-8"?>
• <mule xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:vm="http://www.mulesoft.org/schema/mule/vm"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
• xmlns:spring="http://www.springframework.org/schema/beans"
• xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
• xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
• http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
• http://www.mulesoft.org/schema/mule/vm http://www.mulesoft.org/schema/mule/vm/current/mule-vm.xsd
• http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd">
• <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8087" doc:name="HTTP Listener Configuration"/>
• <flow name="Processor_ChainFlow">
• <http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/>
• <logger message="flow started" level="INFO" doc:name="Logger"/>
• <processor-chain doc:name="ProcessorChain">
• <logger message="- In processor chain start--" level="INFO" doc:name="Logger"/>
• <vm:outbound-endpoint exchange-pattern="request-response" path="vm1" doc:name="VM"/>
• <logger message="- In processor chain end--" level="INFO" doc:name="Logger"/>
• </processor-chain>
• <logger message="--flow end" level="INFO" doc:name="Logger"/>
• </flow>
• <flow name="Processor_ChainFlow1">
• <vm:inbound-endpoint exchange-pattern="request-response" path="vm1" doc:name="VM"/>
• <logger message="--- In flow2--" level="INFO" doc:name="Logger"/>
• </flow>
• </mule>
•

6. • Output:
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• + Started app 'ProcessorChain' +
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• INFO 2016-06-06 08:12:20,627 [[ProcessorChain].HTTP_Listener_Configuration.worker.01]
org.mule.api.processor.LoggerMessageProcessor: flow started
• INFO 2016-06-06 08:12:20,628 [[ProcessorChain].HTTP_Listener_Configuration.worker.01]
org.mule.api.processor.LoggerMessageProcessor: - In processor chain start--
• INFO 2016-06-06 08:12:20,633 [[ProcessorChain].HTTP_Listener_Configuration.worker.01]
org.mule.lifecycle.AbstractLifecycleManager: Initialising:
'connector.VM.mule.default.dispatcher.1501845725'. Object is: VMMessageDispatcher
• INFO 2016-06-06 08:12:20,634 [[ProcessorChain].HTTP_Listener_Configuration.worker.01]
org.mule.lifecycle.AbstractLifecycleManager: Starting:
'connector.VM.mule.default.dispatcher.1501845725'. Object is: VMMessageDispatcher
• INFO 2016-06-06 08:12:20,638 [[ProcessorChain].HTTP_Listener_Configuration.worker.01]
org.mule.api.processor.LoggerMessageProcessor: --- In flow2--
• INFO 2016-06-06 08:12:20,640 [[ProcessorChain].HTTP_Listener_Configuration.worker.01]
org.mule.api.processor.LoggerMessageProcessor: - In processor chain end--
• INFO 2016-06-06 08:12:20,641 [[ProcessorChain].HTTP_Listener_Configuration.worker.01]
org.mule.api.processor.LoggerMessageProcessor: --flow end

7. • Flow of execution:
1. URL to trigger the service from browser
http://localhost:8087
2. POC process a message in order and displays
the Logger info in Console

8. References
• https://docs.mulesoft.com/mule-user-
guide/v/3.7/routers#processor-chain