BOPF: Custom Lock/Unlock Action for Legacy DAC

[gaurav_sharan]

1.    Objective

Objective of this document is to explain how to create custom lock/unlock action in case you are using legacy DAC. In my previous blog I have explain how to configure BOPF using Legacy tables. Refer to below link for more details on BOPF: Using Non-UUIDs (DB_KEY) keys DB tables

https://blogs.sap.com/2018/06/07/bopf-using-non-uuids-db_key-keys-tables/

2.    Why do we need Custom Lock/Unlock Action for Legacy DAC

The standard lock action will acquire a lock based on the instance UUID. Since the transient keys used by the legacy DAC start counting from ‘1’ for each session, it is very likely to experience locking issues. You can check in SM12 if the lock argument shows such a transient key instead of a proper UUID.

3.    How to Implement Custom Lock/Unlock Action

Implementation of Custom Lock/unlock action for legacy DAC requires the following steps:

3.1  BOPF Configuration

BOPF frameworks handles the enqueue and dequeue as well as lock-result implicitly at runtime. Changing the locking options is not supported by SAP, For more details you can refer to below link

https://blogs.sap.com/2015/07/21/abap-to-the-future-my-version-of-the-bopf-chapters-part-3/

If you just need to change Lock/Unlock configuration for Legacy DAC there should not be any issues. You have to make sure no other fields should be changed. For a developer it won’t be difficult to find a way to replace default locking/unlocking implementing Class /BOBF/CL_LIB_A_LOCK.

3.1.1        Enable visibility of Technical Entities

By default, Lock/Unlock Actions are not visible in the transaction Code /BOBF/CONF_UI. You can enable visibility of the technical entities responsible for locking in the display-options (Utilities -> Settings):

3.1.2        Change Implementing Class /BOBF/CL_LIB_A_LOCK

Click on the ROOT Node under then Node Elements then expand ACTION folder. You would be able to find LOCK_ROOT & UNLOCK_ROOT actions. Taking example from my previous blog, see below screenshot of default LOCK_ROOT and UNLOCK_ROOT action implementing class. You need to change configuration and add a custom class.





Configure same custom class for UNLOCK_ROOT.

 

3.2  Coding

Now you need to write your own custom Enqueue/Dequeue logic in the custom class. Custom Logic should be written inside method EXECUTE only.

3.2.1 Sample Code

Taking example from my previous blog BOPF: Using Non-UUIDs (DB_KEY) keys DB tables

https://blogs.sap.com/2018/06/07/bopf-using-non-uuids-db_key-keys-tables/

Locking is done for two custom field Quota Number and company code instead of Transient keys. The following steps provide example codes with step by step approach for enqueue dequeue call.

Step 1: check edit mode is correct else raise exception using BOPF framework

    DATA lr_parameter     TYPE REF TO /bobf/s_frw_lock_parameters.

    DATA ls_location      TYPE /bobf/s_frw_location.

    DATA lr_cm            TYPE REF TO /bobf/cm_lib.

    DATA ls_key           TYPE /bobf/s_frw_key.



    lr_parameter ?= is_parameters.



* check lock mode

    IF lr_parameter->edit_mode <> /bobf/if_conf_c=>sc_edit_exclusive  AND

       lr_parameter->edit_mode <> /bobf/if_conf_c=>sc_edit_shared     AND

       lr_parameter->edit_mode <> /bobf/if_conf_c=>sc_edit_optimistic AND

       lr_parameter->edit_mode <> /bobf/if_conf_c=>sc_edit_promote    AND

       lr_parameter->edit_mode <> /bobf/if_conf_c=>sc_edit_check_optimistic.



      eo_message = /bobf/cl_frw_factory=>get_message( ).

      ls_location-node_key = is_ctx-node_key.

      LOOP AT it_key INTO ls_key.

        ls_location-key = ls_key-key.

        CREATE OBJECT lr_cm

          EXPORTING

            textid             = /bobf/cm_lib=>invalid_lock_mode

            severity           = /bobf/cm_frw=>co_severity_error

            ms_origin_location = ls_location.

        eo_message->add_cm( lr_cm ).

      ENDLOOP.

      et_failed_key = it_key.

      RETURN.

    ENDIF.

 

Step 2:  Based on Action Category Implement Lock and Unlock

IF is_ctx-act_cat = /bobf/if_conf_c=>sc_action_lock.

lock( EXPORTING is_ctx        = is_ctx

it_key        = it_key

is_parameters = lr_parameter->*

IMPORTING et_failed_key = et_failed_key

er_message    = eo_message ).

ELSE.

unlock( EXPORTING is_ctx        = is_ctx

it_key        = it_key

is_parameters = lr_parameter->*

IMPORTING er_message    = eo_message ).

ENDIF.

Step 3: Determine Key from Transient Key GUID using Class /BOBF/CL_LIB_LEGACY_KEY

 

FIELD-SYMBOLS: <fs_bukrs>   TYPE bukrs,

<fs_quotano> TYPE /bsk/quotano.

DATA ls_location            TYPE /bobf/s_frw_location.

DATA lr_cm                  TYPE REF TO /bobf/cm_lib.

DATA: lt_legacy_key         TYPE Ztt_k_db_key.”Legacy DAC Key (used in  alternative root key)

DATA: lv_user               TYPE syuname.



ls_location-node_key = is_ctx-node_key.

"Prepare Legacy key

/bobf/cl_lib_legacy_key=>get_instance( is_ctx-bo_key )->convert_bopf_to_legacy_keys(

EXPORTING

iv_node_key   = is_ctx-node_key    " Key of BOPF node

it_bopf_key   = it_key    " BOPF keys to convert

IMPORTING

et_legacy_key = lt_legacy_key    " Resulting legacy keys

).

er_message = /bobf/cl_frw_factory=>get_message( ).

Step 4: Call Enqueue & Dequeue using Legacy Keys (for Example Company Code, Quota number)

    "Lock

    LOOP AT lt_legacy_key ASSIGNING FIELD-SYMBOL(<fs_legacy_key>).

      "Enqueue

      TRY.

          call_enqueue( EXPORTING iv_bukrs = <fs_legacy_key>-bukrs iv_quotano = <fs_legacy_key>-quotano ).

        CATCH /bsk/cx_dsd_exceptions INTO DATA(lr_exception).

          CLEAR: lv_user.

          lv_user = lr_exception->if_t100_dyn_msg~msgv1.

          "Raise

          CREATE OBJECT lr_cm

            EXPORTING

              textid             = /bobf/cm_lib=>modify_foreign_lock

              severity           = /bobf/cm_frw=>co_severity_error

              ms_origin_location = ls_location

              symptom            = /bobf/if_frw_message_symptoms=>co_foreign_lock

              mv_user            = lv_user.

          er_message->add_cm( lr_cm ).

          "fill failed key

          et_failed_key = it_key.

      ENDTRY.

    ENDLOOP.

Step 5: Enqueue Method

 

METHOD call_enqueue.

CALL FUNCTION 'ENQUEUE_ZE_TQUOTAH'

EXPORTING

*       MODE_ZTQUOTAH       = 'E'

*       MANDT          = SY-MANDT

bukrs          = iv_bukrs

quotano        = iv_quotano

*       X_BUKRS        = ' '

*       X_QUOTANO      = ' '

*       _SCOPE         = '2'

*       _WAIT          = ' '

*       _COLLECT       = ' '

EXCEPTIONS

foreign_lock   = 1

system_failure = 2

OTHERS         = 3.

IF sy-subrc <> 0.

" Raise exception

RAISE EXCEPTION TYPE zcx_dsd_exceptions

MESSAGE ID sy-msgid

TYPE sy-msgty

NUMBER sy-msgno

WITH sy-msgv1

sy-msgv2

sy-msgv3

sy-msgv4.

ENDIF.



ENDMETHOD.

Step 6: Unlock Method

 

METHOD unlock.

DATA: lt_legacy_key TYPE ztt_k_db_key.



"Prepare Legacy key

/bobf/cl_lib_legacy_key=>get_instance( is_ctx-bo_key )->convert_bopf_to_legacy_keys(

EXPORTING

iv_node_key   = is_ctx-node_key    " Key of BOPF node

it_bopf_key   = it_key    " BOPF keys to convert

IMPORTING

et_legacy_key = lt_legacy_key    " Resulting legacy keys

).

"Lock

LOOP AT lt_legacy_key ASSIGNING FIELD-SYMBOL(<fs_legacy_key>).

"Dequeue

call_dequeue( EXPORTING iv_bukrs = <fs_legacy_key>-bukrs iv_quotano = <fs_legacy_key>-quotano ).

ENDLOOP.



ENDMETHOD.

Step 7: Dequeue Method

 

METHOD call_dequeue.

CALL FUNCTION 'DEQUEUE_ZE_TQUOTAH'

EXPORTING

*       MODE_ZTQUOTAH       = 'E'

*       MANDT   = SY-MANDT

bukrs   = iv_bukrs

quotano = iv_quotano

*       X_BUKRS = ' '

*       X_QUOTANO               = ' '

*       _SCOPE  = '3'

*       _SYNCHRON               = ' '

*       _COLLECT                = ' '

.



ENDMETHOD.