Using Contextual Event in Oracle ADF (Region Communication)

Contextual event ,in simple terms is a way to communicate between taskflows.

Sometimes we have taskflow open in a region and have to get some values from that taskflow .

This scenario can be achieved by contextual event.

 

Contextual Event have two parts-

1. Publisher Event (Producer)- As button or any component that can raise event 
2. Handler Event (Customer)- that listens and process event published by producer

This tutorial is based on example developed on default HR schema of Oracle DB 11g

I have created two application and called first one in secod application as region.

• Create first application using Department table of HR schema and drag Department Name on page fragment, now create publisher event (follow steps) for Department Name .
• Select Department Name field in structure window and go to property Inspector select ContextualEvent
  click on green add icon and select event type and name for publisher event

 

• Select field value from Iterator Binding
  
• here you are done with publisher event or producer create a jar of this application in order to use it in second application.
• Now start Second Application that will handle and process this event, create a page and put an output text and set its value from managed bean
  
  
  
  
  
  

• Now create a event handler class to process published event and to make it available to page binding level , we have to create DataControl for this class.
  
  
  
  
  
  
  
  
• Right click on event class and Click on CreateDataControl.
• Now add this method binding to page so that it can be accessible from page binding

• Now drag and drop taskflow from jar library on page as region by this published event will also be available to page
  

  
• Now go to page binding and goto ContextualEvents tab ,click on subscribers tab and click on add icon this will open a popup window ,click on search button , it will show available publisher event, now select event and goto handler search option and select function that you have previously added in page binding
• Give consumer parameter name same as event handler function

 

Now Run your Application - Download ADF Sample Application