Map in Mule
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Mule ESB allows storing data in variables that can be accessed throughout a flow or entire application. This document demonstrates how to define lists and maps as Mule variables, including using Groovy scripts or expression components to initialize variables as Java HashMaps and assign values. Various techniques are shown for declaring map variables directly, or initializing and assigning them to flow variables for later use in a Mule flow.
Map in Mule
- 1. By Anirban Sen Chowdhary
- 2. 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 will see in this demo how to create Map in Mule with Mule variables in different ways. Also note, the data used here is just for demonstration purpose and it doesn’t follow any standard.
- 4. we can define a Map in number of ways
- 5. Step1: In a Groovy Script :-
- 6. So, if we debug we can see the variable is turned into a Hashmap:-
- 7. Step2: In a Groovy Script, directly assigning the value in a variable after declaring the variable as java.util.HashMap() :-
- 8. So, if we debug we can see the variable is turned into a Hashmap:-
- 9. Step3: In a variable directly and initialising it’s value:-
- 10. So, if we debug we can see the variable is turned into a Hashmap:-
- 11. Step3: In an expression component declaring and initialising the HashMap(), then assigning to a flow Variable:-
- 12. So, if we debug we can see the variable is turned into a Hashmap:-
- 13. So, here you can see how to use a Map with Mule variable… Hope I was clear enough to give an Idea of it’s implementation ….
- 14. 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