Componentization in WD ABAP does not work

[Former Member]

Hi Experts,

I am trying to use componentization in WD ABAP.

I have one Business logic componet WD_BLC (BLC) and it contains following context node that differnet views will use and a Method CALCULATE_SUM sum that sums the values.*

Context A

value1

value2

sum

I have three WD components specifically that contain views.

First WD comp has two input fileds which are mapped from interface component context.

WD_VIEW_INPUT - WD component

View_input - WD View

Value 1 - Mapped from Interface Node

Value 2 - Mapped from Interface Node

Second WD Comp has one output filed which is mapped from interface component context.

WD_VIEW_OUTPUT - WD component -

View_output - WD View

Output - Mapped from Interface Node

This third WD component uses View_input from WD component WD_VIEW_INPUT and View_output from WD_VIEW_OUTPUT component using component usages for these views.This wd component also has a button that calls calculate_sum method in WD_BLC.

WD_VIEW_MAIN - WD Component

View_main - WD View

Now it calls the method in the BLC and sums the two values that I put in View_input. but sum value does not get set

in the View_output of component WD_VIEW_OUTPUT. While if I see the same ouput value in View_input using context mapping

I get the sum value.

Binding is done properly also only interface node property is checked for Context A in the WD_BLC.

Please suggest where am I making mistake?

Umang

Edited by: Umang Mathur on May 24, 2011 12:35 AM

Edited by: Umang Mathur on May 24, 2011 12:38 AM

Edited by: Umang Mathur on May 24, 2011 12:40 AM

Edited by: Umang Mathur on May 24, 2011 12:42 AM

[Former Member]

What you miss is the following.

WD_VIEW_INPUT and WD_VIEW_OUTPUT uses their own instance of the WD_BLC. Meaning that the WD_BLC instance is not the same for using components.

What i would do in your case is create a WD_BLC in Third component and pass this instance via inerface a method (comp1,comp2). In this method use the component_usage method enter_referencing mode to set this instance to the usage of

WD_BLC in comp1 and comp2.

[Former Member]

Hi Bhaskaran,

Thanks for a quick reply. I have WD_BLC as a separate component. Can you please specify as to how to pass its instance to the other two components.

Currently I am using one of the context of interface controller and this context is mapped to these two components, now when I set the value in the common node this does not get reflected in the other component.

Can you please elaborate?

Thanks

Umang

Edited by: Umang Mathur on May 24, 2011 1:50 AM

[Former Member]

You have WD_BLC as used component in comp1 and comp2 right ? otherwise you would not have the interface node mapped.

You use comp-3 to embed comp_1 and comp_2 to display. My solution is

1. in comp1,comp2 create a insterface method set_blc_usage with importing parameter type if_wd_component_usage

In this method implement the if_wd_component_usage method ENTER_REFERENCING_MODE.

Any other coding creating blc_usage should be deleted.

2. in comp_3 ,create the component usage of the wdc_blc in the component do_init method.

You may have the coding for the creating the usages of comp_1 and comp_2. If you do not have that then i would advice you to do that as well in the doinit method.

Now you can safely call the set_blc_usage of the comp-1 and comp_2 passing the component usage as exporting parameter.

This will make sure that you have only one instance of the wdc_blc among the 3 components.

Your current scenario suggests me that you have 2 instances of wdc_blc component at runtime.

[Former Member]

Hi Bhaskaran,

Thanks for a quick reply....

My case is like this one.

I have a BLC component that takes care of RFC call so it has all the nodes. I have three one component with three.

WD_Overview, WD_Review, WD_Confirmation views. I navigate between these component using FPM implementation.

But as you said when I navigate from WD_overview which is my first comp and here I call the interface RFC method to populate the methods , WD_Review context is empty. I dont want to call the RFC again now.

Can you share with me as to how create a if_wd_component_usage method ENTER_REFERENCING_MODE.Basically When I call RFC method i want all these usage be declared in the three components.

Thanks....

Edited by: Umang Mathur on May 24, 2011 2:29 AM

Edited by: Umang Mathur on May 24, 2011 3:49 AM