ABAP Keyword Documentation → ABAP - Release-Specific Changes → Changes in Releases 4.xx → Changes in Release 4.0
RFC - Remote Function Call in Release 4.0
Asynchronous RFC
Other versions: 7.31 | 7.40 | 7.54
Modification 1
WAIT [UNTIL condition] UP TO time SECONDS
The command WAIT makes it possible to wait for a response from
a
function module called asynchronously. This requires the addition PERFORMING form ON END OF TASK. WAIT must be executed in the same
internal session.
Modification 2
RECEIVE RESULTS FROM FUNCTION func KEEPING TASK
The KEEPING TASK addition preserves the remote context in the subroutine for reuse.
Other Changes
Modification 3
Error messages from the remote system
If an error occurs in the target system in RFC, details of the
error message are passed to the calling system
(SY-MSGNO, SY-MSGID, SY-MSGTY, SY-MSGV1, SY-MSGV2, SY-MSGV3, and SY-MSGV4). These fields are set to initial in each RFC call.
Modification 4
Load checks for asynchronous RFC
For each RFC
destination, an improved load check is performed for asynchronous RFCs (menu path Destination
->ARFC Options in the RFC destination maintenance screen in
AS ABAP. Before the function
module is executed, the system makes sure that the target host has enough resources. If the host is
overloaded, the execution of the function module is delayed (internally) for a short time. The algorithm
used to determine the load situation on the target machine is the same used in asynchronous RFC with
the addition DESTINATION
IN GROUP. Be aware that this option can only be used for target hosts from Release 3.1H.
Modification 5
SNC option maintenance for RFC destinations
It
is possible to define security options for each RFC destination. This is also possible for RFC Secure Network Communication. The SNC component
(Secure Network Communications) provides added protection, for example by
encrypting data transfers and applying secure mutual authorization between communication partners.
To
use SNC, an external security product must be installed and entered in the
profile (see, for example, parameter snc/enable). If SNC
is used, it is possible to specify whether additional protection functions are used for this destination
in the SNC Mode setting. If this is the case, additional SNC options must be defined in the menu bar: Destination -> SNC Options.
Modification 6
RFC clients as trusted systems
An RFC client that is registered as a
trusted system can log on to the RFC server without a password. Trusted systems must be defined in the
trusting system (the RFC server) using the transaction SMT1.
In the trusted system, the transaction code SMT2 can be used to define which systems act as trusting systems.
Modification 7
Authorization check
If RFC communication takes place within a single system and in the same user context (with the same client and user name), no RFC authorization check based on function groups (using the
authorization object S_RFC) is performed. More information about this topic can be found in
RFC Authorizations.