Mapping and listing with mule
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Transcript of Mapping and listing with mule
![Page 1: Mapping and listing with mule](https://reader036.fdocuments.us/reader036/viewer/2022083105/587a266b1a28abbd388b51a7/html5/thumbnails/1.jpg)
Mapping and Listing with Mule( For beginners )
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Mule ESB has the ability to store data into variables. Fortunately Mule offers 2 types of variables 1) Flow variables that has scope limited to a flow and subflow and 2) Session variables that has scope and can be accessed from entire application.Now, one interesting facts I come across several Mule users is how to define a List or a Map with a variable in Mule in the same way as Java.Let me tell you, this is absolutely possible with Mule.We can define List or a Map in Mule with Mule variables.
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How can we use Mule variables as a List or a Map ?
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We can define a List with a Mule variable in following ways :-
<set-variable variableName="test" value="#[{1000,100,14,1}]" doc:name="Variable"/>Or
<set-variable variableName="test" value="#[[1000,100,14,1]]" doc:name="Variable"/>Here you can see we define a variable named as test which is defined as a List
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Now, we can get the values from the List as follow :-
<logger level="INFO" message="#[flowVars['test'][0]]" doc:name="Logger"/><logger level="INFO" message="#[flowVars['test'][1]]" doc:name="Logger"/><logger level="INFO" message="#[flowVars['test'][2]]" doc:name="Logger"/><logger level="INFO" message="#[flowVars['test'][3]]" doc:name="Logger"/>
As you can see we are retrieving the values from the List with the index
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Now, we can define a Map in the same way as follow :-
<set-variable variableName="customMap" value="#[{'k2':'new', 'k3':'v3'}]" />Or<set-variable variableName="customMap" value="#[['k2':'new', 'k3':'v3‘]]" /> Here you can see we define a variable named as customMap which is defined as a Map
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Now, we can get the values from the Map as follow :-
<logger message="#[flowVars['customMap']['k2']] " level="INFO" doc:name="Logger"/><logger message="#[flowVars['customMap']['k3']] " level="INFO" doc:name="Logger"/> As you can see we are retrieving the values from the Map with the key
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Now, let us consider a simple flow to demonstrate the List and the Map as follow :-
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The Mule config will be :-
You can see here we are using Expression component to reassign our List value of index 1 and index 2 … Then we are using logger to print the new value of List again in the console
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So, if we test the example we will get all the value of List and Map variables as follow as well as with new reassigned value :-
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So, here you can see how to use a List and Map with Mule variable… Hope I was clear enough to give an Idea of it’s implementation ….
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In my next slide I will bring some other techniques in Mule implementation .Hope you have enjoyed this simpler version. Keep sharing your knowledge and let our Mule community grow
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Thank You