How to use expression filter
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The document discusses using expression filters in Mule applications. It provides an example Mule configuration file that uses an expression filter to check the value of a session variable and route the message to a second flow if the value is not equal to "mule". The output shows the message being logged in both flows, demonstrating that the expression filter passed the message to the second flow since the session variable value was "mule studio" rather than just "mule".
![• .mflow
• <?xml version="1.0" encoding="UTF-8"?>
• <mule xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" 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" version="EE-
3.4.0" 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://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd">
• <flow name="MessagePropertiesFlow1" doc:name="MessagePropertiesFlow1">
• <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8089" path="expressionfilter" doc:name="HTTP"/>
• <message-properties-transformer scope="session" doc:name="Message Properties">
• <add-message-property key="property1" value="mule studio"/>
• </message-properties-transformer>
• <logger message="--flow1--#[sessionVars['property1']]" level="INFO" doc:name="Logger"/>
• <expression-filter expression="#[sessionVars['property1']!='mule']" doc:name="Expression"/>
• <vm:outbound-endpoint exchange-pattern="request-response" path="messageproperties" doc:name="VM"/>
• </flow>
• <flow name="MessagePropertiesFlow2" doc:name="MessagePropertiesFlow2">
• <vm:inbound-endpoint exchange-pattern="request-response" path="messageproperties" doc:name="VM"/>
• <logger message="---flow2--#[sessionVars['property1']]" level="INFO" doc:name="Logger"/>
• </flow>
• </mule>](https://image.slidesharecdn.com/howtouseexpressionfilter-160318162710/85/How-to-use-expression-filter-4-320.jpg)
![• Output:
• INFO 2015-10-03 16:00:23,705 [[messageproperties].config.change.14.thread.1] org.mule.DefaultMuleContext:
• **********************************************************************
• * Application: messageproperties *
• * OS encoding: Cp1252, Mule encoding: UTF-8 *
• * *
• * Agents Running: *
• * Clustering Agent *
• * JMX Agent *
• **********************************************************************
• INFO 2015-10-03 16:00:23,706 [[messageproperties].config.change.14.thread.1]
org.mule.module.launcher.MuleDeploymentService:
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• + Started app 'messageproperties' +
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• INFO 2015-10-03 16:00:26,480 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.api.processor.LoggerMessageProcessor: --flow1--mule--studio
• INFO 2015-10-03 16:00:26,482 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.lifecycle.AbstractLifecycleManager: Initialising: 'connector.VM.mule.default.dispatcher.771015974'.
Object is: VMMessageDispatcher
• INFO 2015-10-03 16:00:26,482 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.lifecycle.AbstractLifecycleManager: Starting: 'connector.VM.mule.default.dispatcher.771015974'. Object
is: VMMessageDispatcher
• INFO 2015-10-03 16:00:26,489 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.api.processor.LoggerMessageProcessor: ---flow2--mule--studio](https://image.slidesharecdn.com/howtouseexpressionfilter-160318162710/85/How-to-use-expression-filter-5-320.jpg)
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How to use expression filter
- 1. Expression Filter in Mule
- 2. Abstract • The main motto of this PPT is how to use Expression filter in our applications.
- 3. Example
- 4. • .mflow • <?xml version="1.0" encoding="UTF-8"?> • <mule xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" 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" version="EE- 3.4.0" 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://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd"> • <flow name="MessagePropertiesFlow1" doc:name="MessagePropertiesFlow1"> • <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8089" path="expressionfilter" doc:name="HTTP"/> • <message-properties-transformer scope="session" doc:name="Message Properties"> • <add-message-property key="property1" value="mule studio"/> • </message-properties-transformer> • <logger message="--flow1--#[sessionVars['property1']]" level="INFO" doc:name="Logger"/> • <expression-filter expression="#[sessionVars['property1']!='mule']" doc:name="Expression"/> • <vm:outbound-endpoint exchange-pattern="request-response" path="messageproperties" doc:name="VM"/> • </flow> • <flow name="MessagePropertiesFlow2" doc:name="MessagePropertiesFlow2"> • <vm:inbound-endpoint exchange-pattern="request-response" path="messageproperties" doc:name="VM"/> • <logger message="---flow2--#[sessionVars['property1']]" level="INFO" doc:name="Logger"/> • </flow> • </mule>
- 5. • Output: • INFO 2015-10-03 16:00:23,705 [[messageproperties].config.change.14.thread.1] org.mule.DefaultMuleContext: • ********************************************************************** • * Application: messageproperties * • * OS encoding: Cp1252, Mule encoding: UTF-8 * • * * • * Agents Running: * • * Clustering Agent * • * JMX Agent * • ********************************************************************** • INFO 2015-10-03 16:00:23,706 [[messageproperties].config.change.14.thread.1] org.mule.module.launcher.MuleDeploymentService: • ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ • + Started app 'messageproperties' + • ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ • INFO 2015-10-03 16:00:26,480 [[messageproperties].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: --flow1--mule--studio • INFO 2015-10-03 16:00:26,482 [[messageproperties].connector.http.mule.default.receiver.02] org.mule.lifecycle.AbstractLifecycleManager: Initialising: 'connector.VM.mule.default.dispatcher.771015974'. Object is: VMMessageDispatcher • INFO 2015-10-03 16:00:26,482 [[messageproperties].connector.http.mule.default.receiver.02] org.mule.lifecycle.AbstractLifecycleManager: Starting: 'connector.VM.mule.default.dispatcher.771015974'. Object is: VMMessageDispatcher • INFO 2015-10-03 16:00:26,489 [[messageproperties].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: ---flow2--mule--studio
- 6. • Flow of execution: 1. URL to trigger the service from browser http://localhost:8089/expressionfilter 2. session property is created using message property component In flow1 3. Service displays session properties in flow1 4. VM component in flow1 will call flow2 if the value of the session property is other then mule. 5. In the POC the session property value is “mule studio” so flow1 calls flow2 and displays session property value in flow2