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ID WAIT-FOR • UNTIL WAIT FOR MESSAGING CHANNELS • WAIT FOR MESSAGING CHANNELS ABAP Statement
WAIT FOR MESSAGING CHANNELS Short Reference
ABAP_SYNTAX WAIT FOR MESSAGING CHANNELS $[PUSH CHANNELS$] $[ASYNCHRONOUS TASKS$] UNTIL log_exp $[UP TO sec SECONDS$].
ABAP Addition 1 ... PUSH CHANNELS 2 ... ASYNCHRONOUS TASKS 3 ... UP TO sec SECONDS
What does it do? This variant of the statement WAIT can be used only in receiver programs of ABAP Messaging Channels . Any logical expression can be specified for log_exp after UNTIL.
If the result of log_exp is false and a receiver is registered for APC messages, the program waits until an ON_MESSAGE method has been executed for a message sent by a sender program and checks the logical expression again:
If the new check on the result of the logical expression is true, sy-subrc is set to 0 and the execution of the program is continued with the statement that follows WAIT.
If the new check on the result of the logical expression is false and the RECEIVE methods of all previously sent messages have not yet been executed, one of the remaining RECEIVE methods must be executed before the program continues.
If the new check on the result of the logical expression is false and the RECEIVE methods of all previously sent messages were executed, sy-subrc is set to 4 and the execution of the program is continued with the statement that follows WAIT.
If the result of log_exp is false and no receiver is registered for AMC messages, the execution of the program is not interrupted, regardless of the result of log_exp, and sy-subrc is set to the value 4.
If the logical expression is true, the execution of the program is not interrupted, regardless of whether a receiver is registered for AMC messages, and sy-subrc is set to the value 0. If the statement WAIT interrupts the program, the work process is changed, and a database commit is executed, except in updates. For this reason, WAIT must not be used between AB-SQL statements that open or close a database cursor. System Fields sy-subrcMeaning 0The logical expression log_exp is true. 4The logical expression log_exp is false. Also, no receiver is registered for AMC messages in the current ABAP_ISESS and no registrations for APC messages or asynchronous function calls exist when the additions PUSH CHANNELS or ASYNCHRONOUS TASKS are used. 8The logical expression log_exp is false and when the addition UP TO was specified, the maximum time was exceeded.
Latest notes: If the logical expression is false, the running program is stopped in its current state. After a RECEIVE method, all data objects that were not changed in the RECEIVE method have the same value as when the logical expression was last evaluated. Any methods called by functions within the logical expression are executed again during the next check. ABAP_HINT_END
What does it do? If these additions are specified, this variant of the statement WAIT is combined with the variants WAIT FOR PUSH CHANNELS or WAIT FOR ASYNCHRONOUS TASKS . The program flow described in the variants is added to the program flow described above. The WAIT statement then also waits for APC messages or for asynchronously called functions to be called and does not just wait for AMC messages. • UP TO SECONDS WAIT FOR MESSAGING CHANNELS
ABAP Addition
What does it do? If UP TO is specified, a maximum time sec can be specified in seconds and the statement waits for AMC for this time. sec expects a data object of the type f that must contain a positive number. The unit of the number in sec is seconds and the time resolution is one millisecond. If no AMC message is received within the specified time and its RECEIVE method causes the result of the logical expression log_exp to be true, sy-subrc is set to 8, and the execution of the program is continued with the statement that follows WAIT.
Latest notes:
If no receiver is registered for AMC messages, the addition UP TO sec SECONDS is ignored.
The addition UP TO sec SECONDS is ignored with respect to the execution of the RECEIVE methods. Their execution duration can be longer than the time span specified. ABAP_HINT_END
