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About us…


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STRONG FINISHES


Serialize ABAP OO instances

Proof of concept for parallelization in ABAP-OO

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• Altough we getting an incredible speed boost by using SAP HANA, sometimes databasespeed is not the bottleneck.

• Parallelization of ABAP code is not very common.

• The FM are marked as released in SM37

• The possibility exists for years (eg. FM SPBT_INITIALIZE, which is used, was released in1996 already)

• SAP themselves using this technic for example in SGEN loads and MRP

• Parallelization can shorten runtime, but is stressing database and application server

Side view „Serialization“ ABAP-OO


In computer science, in the context of data storage, serialization is theprocess of translating data structures or object state into a format that canbe stored (for example, in a file or memory buffer, or transmitted acrossa network connection link) and reconstructed later in the same or anothercomputer environment.

Source: https://en.wikipedia.org/wiki/Serialization

Side view „Serialization“ ABAP-OO


How does it work…

• Enhance your ABAP class (global or local) with Interface “if_serializable_object“.

• No additional code is needed inside the ABAP class.

• Code Example for a consumer report:

http://www.tricktresor.de/blog/serialize-me/

DATA: o_land TYPE REF TO zcl_country,

ser TYPE string.

o_land = NEW #( land1 = l_county ).

o_land->do_something( ).

CALL TRANSFORMATION id

SOURCE model = o_land

RESULT XML ser.

Create variable for instance and

serialization string

Get instance of class and run methods

Serialize all attributes into XML-

String

Use cl_abap_gzip=>compress_textto compress data to xstring if needed.

Side view „De-Serialization“ ABAP-OO


Convert back your XML to another instance of your class…

http://www.tricktresor.de/blog/serialize-me/

DATA: o_land2 TYPE REF TO zcl_country.


SOURCE XML ser

RESULT model = o_land2.

Create variable for new instance

De-Serialize all attributes from XML-

String

o_land2 = NEW #( land1 = l_county ).

o_land2->do_something_different( ).

Get new instance of class and run

methods


Parallelization ofABAP Code

The „EVA“ Principle (IPO model)


E

V

A

Input

Processing

Output

Example of advanced programming technic

The input–process–output (IPO) model, or input-process-output pattern, is a widely used approach in system analysis and software engineering for describing the structure of an information processing program or other process.

https://en.wikipedia.org/wiki/IPO_model

The Processing – the usual way


VProcessing

Example of advanced programming techniques

Calculate

Next-Record

Calculate

Calculate

The program runsequentialy through theoperations, altoughthere is no dependencybetween thecalculation.Eg: Special MRP processes

Next-Record

Next-Record

The Processing – the parallel way


VProcessing


Calculate

Record 1

Calculate

Record 2

Calculate

Record 3

Initiateparallel run

Wait all tobe finished

Requirement: The parallel runningsteps are independent to each other.In ABAP, the parallel running steps aredone by using a function module.

The Cookbook



To run parallel ABAP-Code, the following steps are needed:

• Create a logon group in RZ12 for parallel processing (administrative task, must be done in each system)

• Determine, how many jobs can run parallel• Call parallel running function module with your code as new task• Getting FM results in a call back subroutine• Check all tasks are finished.• Continue processing of program

Logon Group tcode RZ12



Create a new „Logon Group“ in RZ12. This must be done once in each system. You can also reuse an exisiting one

The logon group (here: parallel_generator) is case sensitive

Logon Group tcode RZ12



The entries are self explaining. Older NW Stack (up to 7.4?) offers „Min Anz.freie WP“, whichcontrolls, how many workprocesses will be untouched forgeneral use by the system.

Walk through the easy example program



Declaration of some variables which are needed later on.

LOAD-OF-PROPRAM.

DATA: g_group TYPE rzllitab-classname VALUE ‘parallel_generators',

g_wp_available TYPE i, "Number of dialog work processes

g_snd_jobs TYPE i VALUE 1, "Work packets sent for processing

g_rcv_jobs TYPE i VALUE 1, "Work packet replies received.

g_taskname(4) TYPE n VALUE 1. "identifier of task

Walk through the easy example program



DATA l_msg TYPE char80 VALUE space.

* Initialize the "Parallel Background Tasks" enviroment

CALL FUNCTION 'SPBT_INITIALIZE'

EXPORTING

group_name = g_group

IMPORTING

free_pbt_wps = g_wp_available.

WRITE: / 'No of max. parallel jobs:'(001), g_wp_available.

* Loop the itab (5 values) and run the worker method parallel in separate tasks

LOOP AT git_data ASSIGNING FIELD-SYMBOL(<fs>).

CALL FUNCTION 'Z_RFC_PARALLEL'

STARTING NEW TASK <fs>-key " will be taskname in return_info

DESTINATION IN GROUP g_group

PERFORMING z_rfc_parallel_return ON END OF TASK

EXPORTING

pi_time = <fs>-time

EXCEPTIONS

communication_failure = 1 MESSAGE l_msg

system_failure = 2 MESSAGE l_msg

resource_failure = 3 .

IF sy-subrc NE 0.

WRITE: / l_msg.

EXIT.

ENDIF.

ADD 1 TO g_snd_jobs. " Increment no. of started jobs

get the max number of usable work processes of logon group

Call FM as new task. Important: return_info is the subroutine which is called at the end of the task

Walk through the easy example programThe RFC-FM to call



FUNCTION z_rfc_parallel.

*"----------------------------------------------------------------------

*"*"Lokale Schnittstelle:

*" IMPORTING

*" VALUE(PI_TIME) TYPE I

*" EXPORTING

*" VALUE(PE_STRING) TYPE STRING

*"----------------------------------------------------------------------

* Create instanz and run the costy method

DATA(lo_myclass) = NEW zcl_parallel_demo( ).

lo_myclass->worker( pi_time = pi_time ).

* Serialize instance to string.


SOURCE model = lo_myclass

RESULT XML pe_string.

ENDFUNCTION.

Walk through the easy example programThe call back routine



##PERF_NO_TYPE

FORM z_rfc_parallel_return USING taskname. "do not use 'type xxxx' here.

DATA: l_string TYPE string,

l_msg TYPE char80 VALUE space.

* Import the FM export parameters (here: serialized instance)

RECEIVE RESULTS FROM FUNCTION 'Z_RFC_PARALLEL'

IMPORTING pe_string = l_string

EXCEPTIONS

communication_failure = 1 MESSAGE l_msg

system_failure = 2 MESSAGE l_msg

resource_failure = 3 .

IF sy-subrc EQ 0.

ADD 1 TO g_rcv_jobs. " Increment no. of received jobs

READ TABLE git_data WITH KEY key = taskname ASSIGNING FIELD-SYMBOL(<fs>).

IF sy-subrc EQ 0.

CALL TRANSFORMATION id " Deserialize string to instance

SOURCE XML l_string

RESULT model = <fs>-o_class.

ELSE.

WRITE: / l_msg.

EXIT.

ENDIF.

ENDIF.

ENDFORM.

Example program serial run

Example program Parallel

Runtime comparisons

Worker Serial Parallel

Wait up to n seconds 13,1 sec 5,1 sec

Test code as shownin example

23,7 sec 14,1 sec

Special MRP (Inhousedevelopment)

> More than 50 min, caused shortdump

Approx. 8 min

git_data = VALUE #( ( key = 'A' time = 3 )

( key = 'B' time = 1 )

( key = 'C' time = 2 )

( key = 'D' time = 5 )

( key = 'E' time = 2 ) ).

Example code

The example code can be found here:https://www.dropbox.com/sh/acdyfiecqwoc0db/AAAbZFW7P8MWdzl9zz0gpYtMa?dl=0

https://www.dropbox.com/sh/acdyfiecqwoc0db/AAAbZFW7P8MWdzl9zz0gpYtMa?dl=0

THANKS FOR LISTENING.

| page 1 · pdf fileproof of concept for parallelization in abap-oo | page 13 | ck •...

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