VM Connector in Mule with Example

VM Connector in Mule with Example

  • The Virtual Machine (VM) connector handles intra-app and inter-app communication through asynchronous queues that can be transient or persistent.
  • Transient queues are faster than persistent queues, but they are not reliable in the case of a system crash.
  • Persistent queues are slower but reliable.
  • When running on a single instance, persistent queues work by serializing and storing the contents on the disk.

When to Use the VM Connector : 
  • When you want to pass messages from one flow to another through a queuing mechanism, instead of using <flow-ref /> directly.
  • When you want to distribute work across a cluster.
  • When you want to communicate with different apps that are running in the same Mule domain.
  • When you need simple queuing that does not justify a full JMS broker.
flow of VM Connector : 

VM connector configuration of test_vmFlow : 

VM connector configuration of test_vmFlow1 :

Note that Queue path should be same in both VM connectors.
flow variable of first flow can not be accessed in second flow because of transport barrier.

URL :  http://localhost:8085/api/vm
Method : GET

Output : 

XML project code :

<?xml version="1.0" encoding="UTF-8"?> <mule xmlns:vm="http://www.mulesoft.org/schema/mule/vm" xmlns:http="http://www.mulesoft.org/schema/mule/http" 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/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd http://www.mulesoft.org/schema/mule/vm http://www.mulesoft.org/schema/mule/vm/current/mule-vm.xsd"> <http:listener-config name="HTTP_Listener_Configuration" host="" port="8085" basePath="/api" doc:name="HTTP Listener Configuration"/> <flow name="test_vmFlow"> <http:listener config-ref="HTTP_Listener_Configuration" path="/vm" doc:name="HTTP"/> <set-variable variableName="testvar" value="welcome to vm" doc:name="Variable"/> <vm:outbound-endpoint exchange-pattern="request-response" path="testqueue" doc:name="VM"/> <logger message="VM flow ends........" level="INFO" doc:name="Logger"/> </flow> <flow name="test_vmFlow1"> <vm:inbound-endpoint exchange-pattern="request-response" path="testqueue" doc:name="VM"/> <logger message="testvar value : #[flowVars.testvar]" level="INFO" doc:name="Logger"/> </flow> </mule>

© 2020 goformule.com

Share on :

Mule 4:

XML to JSON in mule 4 Web service consumer VM Validation in Mule 4 Until Successful
Sub flow Set Variable & Remove Variable Set Transaction ID Scatter Gather Round Robin
Consume Restful Service CRUD in Mule 4 Parse Template Object to JSON Load Static Resource
JSON to XML Invoke Idempotent Filter ForEach Flat file to JSON
Fixwidth to JSON First Successful File Execute Error Handling
Email Dynamic Evaluate Custom Business Event CSV to JSON Copybook to JSON
Choice Router Async RabbitMQ

Mule 3:

Database Connector Async CXF Attachement XSLT
Mongo DB Cache scope Custom Business Event Gzip Compress Expression
SMTP For Each Expression Javascript Filter Reference
Salesforce Message Enricher Groovy Parse Template Idempotent
VM Poll Invoke Ruby Message
Webservice consumer Python Transformer reference Message Property Not
Collection Aggregator First Sucessful Catch Exception Strategy Reference Exception Strategy Or
Choice Message Chunk Aggregator Choice Exception Strategy Global Exception Strategy Schema Validation
Custom Aggregator Scatter Gather Custom Exception Strategy Batch Processing MEL
M Unit RAML Map Operator API Mocking Dataweave