Fast and easy creation of a multition classe using an AdT template (EWM example)

[joachimrees1]

I wrote at https://blogs.sap.com/2022/07/01/multiton-example-using-a-singleton-in-wm-oder-ewm-what-about-lgnum/ how - in EWM - I often want to use multiton classes.

And as I don't want to type a lot, I made myself a AdT template. This is it:

Spoiler: the variable ${enclosing_object} is what makes it so god!

CLASS ${enclosing_object} DEFINITION

  PUBLIC

  FINAL

  CREATE PRIVATE.



  PUBLIC SECTION.

    CLASS-METHODS: get_instance IMPORTING iv_lgnum             TYPE /scwm/lgnum

                                RETURNING VALUE(rref_instance) TYPE REF TO ${enclosing_object}.

  PROTECTED SECTION.

  PRIVATE SECTION.

    TYPES: BEGIN OF gty_instance_buffer,

             lgnum    TYPE /scwm/lgnum,

             instance TYPE REF TO ${enclosing_object},

           END OF gty_instance_buffer.

    CLASS-DATA: st_instance_buffer TYPE HASHED TABLE OF gty_instance_buffer WITH UNIQUE KEY lgnum.



    METHODS constructor  IMPORTING iv_lgnum TYPE /scwm/lgnum.



    DATA: mv_lgnum TYPE /scwm/lgnum.

ENDCLASS.



CLASS ${enclosing_object} IMPLEMENTATION.

  METHOD constructor.

    me->mv_lgnum = iv_lgnum.

  ENDMETHOD.

  METHOD get_instance.

    READ TABLE st_instance_buffer WITH TABLE KEY lgnum = iv_lgnum

                                  ASSIGNING FIELD-SYMBOL(<lfs_instance>).

    IF sy-subrc EQ 0.

      rref_instance = <lfs_instance>-instance.

    ELSE.

      rref_instance = NEW ${enclosing_object}( iv_lgnum = iv_lgnum ).

      INSERT VALUE #( lgnum = iv_lgnum instance = rref_instance ) INTO TABLE st_instance_buffer.

    ENDIF.

  ENDMETHOD.

ENDCLASS.

 

And here is ho to use it:

1. Creat a class in ATD. It will come with some code:

A newly created class in AdT

2. strg+A select all and delete everything.

3. type multi (or whatever you name the template) + space for completion suggestions, select the right template:

AdT template-suggestion

 

4. and hit enter.
5. Done! (as in now you can start coding the actual logic!)