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Mule Expression Language (MEL) in Mule

  Mule Expression Language (MEL) in Mule




MEL is a lightweight, Mule-specific expression language that you can use to access and evaluate the data in the payload, properties and variables of a Mule message. Accessible and usable from within virtually every message processor in Mule, MEL enables you to quickly and elegantly filter, route, or otherwise act upon the different parts of the Mule message object.

http listener path : It returns http listener path

 #[message.inboundProperties.'http.listener.path']  

http method : It returns http method

#[message.inboundProperties.'http.method'] 

http query params : It returns http query parameters
#[message.inboundProperties.'http.query.params'.{param name}]  

http query string  : It returns http query string

#[message.inboundProperties.'http.query.string'] 

http remote address : It returns http remote address

#[message.inboundProperties.'http.remote.address'] 

http request path : It returns http request path

#[message.inboundProperties.'http.request.path']  

http.request.uri :  It returns http request uri 

#[message.inboundProperties.'http.request.uri']  

http.scheme : It returns http scheme 

#[message.inboundProperties.'http.scheme']  

http status : It returns http status

#[message.inboundProperties.'http.status']

http uri params : It returns http uri parameters

#[message.inboundProperties.'http.uri.params']
  
http version : It returns http version
#[message.inboundProperties.'http.version'] 
  
correlationGroupSize : It returns correlationGroupSize
#[message.correlationGroupSize]

correlationId : It returns correlationId 

#[message.correlationId]

correlationSequence : It returns correlationSequence 

#[message.correlationSequence]
  
dataType : It returns data type
#[message.dataType]

exception : It returns exception type

#[message.exception]

id : It returns id

#[message.id]

inboundAttachments : It returns inboundAttachments 

#[message.inboundAttachments]

outboundAttachments : It returns outboundAttachments

#[message.outboundAttachments]

MULE_ENCODING : It returns mule encoding

#[message.outboundProperties.MULE_ENCODING]

replyTo : It returns reply to

#[message.replyTo]

rootId : It returns root id

#[message.rootId]

payload : It returns payload
#[message.payload] 

for accessing flow variables : 

#[flowVars.variablename]

for accessing session variables : 

#[sessionVars.variablename]

for accessing record variables : 

#[recordVars.variablename]

for accessing inbound header values : 

#[message.inboundProperties.headername]



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Please go through below tutorials:


Mule 4 Tutorials

DEPLOY TO CLOUDHUB C4E CLIENT ID ENFORCEMENT CUSTOM POLICY RABBIT MQ INTEGRATION
XML TO JSON WEBSERVICE CONSUMER VM CONNECTOR VALIDATION UNTIL SUCCESSFUL
SUB FLOW SET & REMOVE VARIABLE TRANSACTION ID SCATTER GATHER ROUND ROBIN
CONSUME REST WEBSERVICE CRUD OPERATIONS PARSE TEMPLATE OBJECT TO JSON LOAD STATIC RESOURCE
JSON TO XML INVOKE IDEMPOTENT FILTER FOR EACH FLAT TO JSON
FIXWIDTH TO JSON FIRST SUCCESSFUL FILE OPERATIONS EXECUTE ERROR HANDLING
EMAIL FUNCTIONALITY DYNAMIC EVALUATE CUSTOM BUSINESS EVENT CSV TO JSON COPYBOOK TO JSON
CHOICE ASYNC

Widely used Connectors in Mule 3

CMIS JETTY VM CONNECTOR SALESFORCE POP3
JMS TCP/IP WEBSERVICE CONSUMER QUARTZ MONGO DB
FILE CONNECTOR DATABASE CONNECTOR


Widely used Scopes in Mule 3

SUB FLOW REQUEST REPLY PROCESSOR CHAIN FOR EACH CACHE
ASYNC TCP/IP COMPOSITE SOURCE POLL UNTIL SUCCESSFUL
TRANSACTIONAL FLOW

Widely used Components in Mule 3

EXPRESSION CXF SCRIPT RUBY PYTHON
JAVASCRIPT JAVA INVOKE CUSTOM BUSINESS EVENT GROOVY
ECHO LOGGER


Widely used Transformers in Mule 3

MONGO DB XSLT TRANSFORMER REFERENCE SCRIPT RUBY
PYTHON MESSAGE PROPERTIES JAVA TRANSFORMER GZIP COMPRESS/UNCOMPRESS GROOVY
EXPRESSION DOM TO XML STRING VALIDATION COMBINE COLLECTIONS BYTE ARRAY TO STRING
ATTACHMENT TRANSFORMER FILE TO STRING XML TO DOM APPEND STRING JAVASCRIPT
JSON TO JAVA COPYBOOK TO JSON MAP TO JSON JSON TO XML FLATFILE TO JSON
FIXWIDTH TO JSON CSV TO JSON


Widely used Filters in Mule 3

WILDCARD SCHEMA VALIDATION REGEX PAYLOAD OR
NOT MESSAGE PROPERTY MESSAGE IDEMPOTENT FILTER REFERNCE
EXPRESSION EXCEPTION CUSTOM AND


Exception Strategy in Mule 3

REFERENCE EXCEPTION STRATEGY CUSTOM EXCEPTION STRATEGY CHOICE EXCEPTION STRATEGY CATCH EXCEPTION STRATEGY GLOBAL EXCEPTION STRATEGY


Flow Control in Mule 3

CHOICE COLLECTION AGGREGATOR COLLECTION SPLITTER CUSTOM AGGREGATOR FIRST SUCCESSFUL
MESSAGE CHUNK AGGREGATOR MESSAGE CHUNK SPLITTER RESEQUENCER ROUND ROBIN SOAP ROUTER