Refreshing Taskflow without contextual event - Search Results use case

Hi All,

       In this post I am going to explain some tricky way to refresh the taskflow that doesn't have contextual event and also isolated data control(datacontrol not shared). There is another way explained by Andreju's communicating between regions without contextual events.  

download app here

Use case :

             Lets consider the search and showing results use case. I have two taskflows, one is Search Taskflow and for showing the results I have separate Taskflow. For searching the employees in the particular department,  lets have search field in the search taskflow and results taskflow should show the employees in the departments.

For example, If the page contains multiple taskflows, those will be refreshed from one consumer class. i.e., on click of search you can refresh the multiple taskflows for those doesn't have the events.

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1. Create two taskflow Search TF and ResultsTF with input parameters on both. In my case I am passing the helper class as parameter such as SearchHelper and ResultsHelper

2. Now we are going to use the contextual event for the SearchTF, for that create a producer and launch the event on click of search button on the SearchTF and my ResultsTF doesn't have any events but has one helper class as input parameter 

 

3.   Results bean in the Results page has the method that filters the records based on the search key(department id). And also , in the constructor I am getting the helper parameter object.

and  I am reading the viewobject onload and setting the vo into my ResulttsHelper class.

So, at very first time when the taskflow loads, I am getting the vo and setting it into the ResulttsHelper.

 To avoid using code in constructor you can use Method call activity and mark it as default activity so that onload of the taskflow it will get executed.

  

Now here the trick helps, similarly I am setting the bean instance also in my ResulttsHelper class like below using one of the binded getter method in the Results bean,

 

 

4. Now drag drop two taskflows in the main page and and consume the event using a consumer class.

SearchTF event consumer in mainpage.jspx page definition

5. The consumer finally calls the method inside the ResultsTF.  The highlighted line below is accessed gives the instance of the Results bean which is been set o load, refer Step 3 image.

The results table is filtered and refreshed inside the method refreshTF, also you can refresh the table  from the consumer be directly accessing the components like below,

AdfFacesContext.getCurrentInstance().addPartialTarget(rhelper.getBackingBean().getTable());

And finally the result looks like this,
 

Download sample here

How to use contextual events ?

  

http://andrejusb.blogspot.in/2011/02/adf-region-communication-data-exchange.html
http://andrejusb.blogspot.in/2010/10/contextual-events-framework-and-adf-11g.html