Global Class : Events

Ex :-

Steps

1.Create a triggering method in a class which will raise the event. 

• Go to transaction code SE24.

• Enter the class name start's with ZCL_<class name > and click on Create.

• Pop-up will appear.
• Enter the short description and click on SAVE.

• Save it in either Package or Local Package.

• Create a Event triggering method.

• To pass parameters , Click on method name and click on Parameters.

• Pass the parameters.

• Click on Save and click on BACK button.
• Double Click on Method name.

• Enter the source code.

• " RAISE EVENT " command is used to trigger the Event.
• Copy the Event name.
• Click on Save and click on Back button.

2.Create an event .

• Click on Events Tab.

• Enter the Event name ,  Type and Visibility of the Event.

• Click on Methods Tab.

3.Create an event handler method for the event in same/other class.

• Enter the event handler method name , Type and Visibility.

• Select the event handler name and click on " Detail View ".

• Pop-up will appear.
• Click on " Event Handler for ".

• Enter the Class name and Event name.
• Click on Change.

• Looks like,

• To implement the event handler method , double click on event handler method and enter the source code.

• Save and click on Back button.
• Create a method to display data.

• To Pass the parameters, click on method name and click on Parameters.

• Pass the parameters.

• Click on Save and click on BACK button.
• To implement the method , double click on method name.

• Source code.

• Save 
• Click on BACK.
• Save -> Check -> Activate.

• Copy the Class name.

Main Program

• Go to Transaction code SE38.

• Enter the program name which start's with Y or Z < program name > and click on Create.

• Pop-up will appear.
• Enter the Title.
• Select the Attribute Type as Executable Program.
• Click on Save.

• Source Code.

DATA : OBJ TYPE REF TO ZCL_EVENT_CLASS.

DATA : IT_VBRP TYPE TABLE OF VBRP.

PARAMETERS : P_VBELN TYPE VBRP-VBELN.

START-OF-SELECTION.

CREATE OBJECT OBJ.

"4. Register the event handler method in the program.

SET HANDLER OBJ->EVENT_HANDLER FOR OBJ.

CALL METHOD OBJ->FECT_DATA

  EXPORTING

    IM_VBELN = P_VBELN

  CHANGING

    CH_ITAB  = IT_VBRP

    .

CALL METHOD OBJ->DISPLAY

  EXPORTING

    CH_ITAB = IT_VBRP

    .

• Save -> Check -> Activated.
• Execute ( F8 ).

Input -1 .

• Click on Execute without entering input value.

Output

Input - 2

• Enter the input.

Output

• Click on Execute.