Um eine bestimmte Tabelle mit Queues zu lesen, müssen ein Reader Object und ein Unit Reader Object erstellt werden. Für jede Queue werden die Einheiten in Blocks zu n gelesen. Für jede Einheit wird das Format der Payload bestimmt und dann die Payload extrahiert und die Größe der Einheit festgestellt. Nachdem alle n Einheiten in einem Block auf diese Weise gelesen und analysiert wurden, werden sie auf der Datenbank bestätigt, d.h. zur Löschung markiert.
a) Input parameters:
ap_name TYPE ldq_application_name DEFAULT 'Perf_TEST',
qp_name TYPE ldq_queue_name DEFAULT 'LDQ_TEST_',
n_queues TYPE i DEFAULT 5,
n_units TYPE i DEFAULT 10,
n_times TYPE i DEFAULT 1.
b) Declarations:
DATA: l_ldq_reader TYPE REF TO if_ldq_reader,
l_ldq_unit_reader TYPE REF TO if_ldq_unit_reader.
DATA: l_queue_name_tab TYPE ldq_queue_name_tab,
l_queue_name TYPE ldq_queue_name.
DATA: l_xdata TYPE xstring,
l_cdata TYPE string.
DATA: l_size TYPE i.
DATA: l_content_tab TYPE ldq_unit_content_reader_tab.
DATA: l_state_tab TYPE ldq_unit_state_reader_tab.
DATA: l_del TYPE i.
DATA: l_seq_nr TYPE ldq_unit_id.
DATA: l_queue_nr(4) TYPE n.
DATA: l_lines TYPE i.
DATA: l_last_lines TYPE i.
DATA: l_unit TYPE i.
DATA: l_state_wa TYPE REF TO if_ldq_unit_state_reader,
l_content_wa TYPE REF TO if_ldq_unit_content_reader.
DATA: l_format TYPE ldq_data_format.
DATA: l_next_state_nr TYPE i.
DATA: l_number TYPE i.
TYPES: BEGIN OF lt_my_unit_reader,
unit_reader TYPE REF TO if_ldq_unit_reader,
queue_name TYPE ldq_queue_name,
END OF lt_my_unit_reader.
DATA: l_my_unit_reader_tab TYPE TABLE OF lt_my_unit_reader.
DATA: l_my_unit_reader TYPE lt_my_unit_reader.
FIELD-SYMBOLS: <l_content_wa> TYPE REF TO if_ldq_unit_content_reader.
FIELD-SYMBOLS: <l_state_wa> TYPE REF TO if_ldq_unit_state_reader.
c) Creation of queue names:
CLEAR: l_queue_name_tab[], l_content_tab[].
DO n_queues TIMES.
l_queue_nr = sy-index.
CONCATENATE qp_name l_queue_nr INTO l_queue_name.
CONDENSE l_queue_name NO-GAPS.
APPEND l_queue_name TO l_queue_name_tab.
ENDDO.
LOOP AT l_queue_name_tab INTO l_queue_name.
d) Creation of LDQ application object:
l_ldq_reader = cl_ldq_application=>get_reader( ap_name ).
*
* Creation of LDQ queu objects for each queue name
*
l_my_unit_reader-unit_reader = l_ldq_reader->set_queue_name( l_queue_name ).
l_my_unit_reader-queue_name = l_queue_name.
APPEND l_my_unit_reader TO l_my_unit_reader_tab.
ENDLOOP.
*
* Read the block units over all queues n_times
*
DO n_times TIMES.
*
LOOP AT l_my_unit_reader_tab INTO l_my_unit_reader.
e) Get n_units in one block:
l_content_tab = l_my_unit_reader-unit_reader->get_next_contents( n_units ).
l_unit = LINES( l_content_tab ).
f) Retrieve contained information out of content object:
CLEAR l_number.
WRITE: / l_unit, 'Qname:', l_my_unit_reader-queue_name.
LOOP AT l_content_tab ASSIGNING <l_content_wa>.
l_format = <l_content_wa>->get_format( ).
IF cl_ldq_unit_writer=>co_character_data_type = l_format.
l_cdata = <l_content_wa>->get_cdata( ).
ELSE.
l_xdata = <l_content_wa>->get_xdata( ).
ENDIF.
l_seq_nr = <l_content_wa>->get_sequence_number( ).
l_size = <l_content_wa>->get_size( ).
l_number = l_number + 1.
WRITE: /10 'number:', l_number, 'sequence number =', l_seq_nr, 'size in kb:', l_size.
ENDLOOP.
g) Confirm the read unit in the database:
*
l_my_unit_reader-unit_reader->confirm( ).
h) Persist the read status of LDQ data into the database:
COMMIT WORK.
ENDLOOP.