Functions in Oracle Business Rule

This sample demonstrates creation of a custom function in Oracle Business Rules, using it in the RuleSet and calling it form a BPEL Process

High-level details

This example involves the following

a.      Implementation of a custom function in Oracle Business Rule

This is a simple function that adds the input date by 1 day and returns. This function will be further enhanced in later examples by extending the logic.

b.      Calling the custom function from the Business Rule If-Else Decision Service

c.      Calling the Business Rule from BPEL

Implementation

·        Create a schema for the input and output

·        Create a SOA Process with a BPEL Process using these input and output

·        Create a new Business Rule Component in the same component using the same input and output. In this example, since the usage of BPEL process is just to call the Business Rule, the schema elements are same but these could be any depending on your business requirement.

·        Business Rule Implementation

a.      Creating Globals - for constants

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a.      Creating Function

First, define the signature of the function

Click on the '+' icon, give the name of the function, returnType, and description

In the Arguments section, define the input arguments of this function

You'll see a warning as the function is not implemented yet

Pseudo Code for the function

Initialize the variables

Convert the input  string into XMLGeorgianCalendar format (This has many date related functions, so used this type)

Add 1 day to this converted date

Convert the resulting value to String and return

a.      Defining Ruleset

               This is a simple ruleset to call the just defined function

The final Ruleset looks like this

Now that the Business Rule is implemented successfully, the only thing left is to use this in the BPEL Process

·        Using the Business Rule inside BPEL Process

Inside BPEL, drag and drop the Business Rule component from the SOA Components section in the Resource Pallette

Input & Output Association in BPEL

Your final BPEL Process should look like this

Thats it!

Deploy & Test the Process