Working with the Function Builder in Software

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Working with the Function Builder
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Figure 7 30: Creating a function module. Establishing the Interface To define a function module interface, you must define the formal import, export, and changing parameters as well as communicate the exceptions which might return the function module. To do this, you have five different tabstrips folders in the Create Function module screen (Import/Export/Changing/Tables/Exceptions) for each interface element. For every interface element, you can define the following fields: Interface Element Import
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Fields Import parameters Reference field/structure Reference type Proposal Optional Reference
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Description Name of formal import parameters
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Name of data dictionary field defining the former parameter
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Internal ABAP type Parameter default value Indicates whether a parameter is mandatory By reference/by value Name of formal export parameters
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Export parameters Reference field/structure Reference type
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Name of data dictionary field defining the former parameter
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Internal ABAP type
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Working with the Function Builder Reference Changing Changing parameters Reference field/structure Reference type Proposal Optional Reference Tables Table parameters Reference structure Reference type Optional Exception Editing the ABAP Source Code Exceptions By reference/by value Name of formal changing parameters
Name of data dictionary field defining the former parameter
Internal ABAP type Parameter default value Indicates whether a parameter is mandatory By reference/by value Name of formal table parameters
Name of data dictionary field defining the former parameter
Internal ABAP type Indicates whether a parameter is mandatory Name of exception
When modifying a function module code, you can have two different types of changes: Global data or Main program. According to the change type, users must check the corresponding radio button on the function builder initial screen and click on the Change button. In each case, the system displays the usual ABAP editor screen with the corresponding program codes and with the name L<functgrp>Unn for a main program or L<functgrp>TOP for global data.
Checking and Activating
As with all other development environment objects, functions can also be checked and activated. To check and activate function modules, select the following options: Function module Check Function module Activate If the system finds any inconsistencies, it will display an error message.
Testing and Performance
Testing and Performance
The function builder provides extensive functionality for verifying the correctness of functional modules before these are released or before they are called by other programs. To run a test: Enter the function name in the input field of initial function builder screen and press the Test or Sgnl. Test button. The system displays the Test Function Module initial screens, including the import and changing fields defined for the function module. Before clicking on the Execute button, you must enter appropriate values for performing the test. If you want the test execution to be run in debugging mode, you must press the Debugging button. Figure 7 31 shows an example of the Test Function Module initial screen.
Figure 7 31: Test function module initial screen. The system shows a new screen with the value of the import, export, and changing parameters, as well as the resulting exceptions and information about the runtime. The function builder can be used also for storing test executions so that they can be compared later with other runs. To do this, proceed as follows: When in a screen with test results, press the Save icon, and enter a short text description for the test in the input field of the dialog window. From the initial Test Module Function screen, you can access the saved tests by selecting Test Data Directory. This option takes you to the Test Data Directory screen, where the system displays the stored test execution for that function module. The system provides several alternatives for using the previous test results: To get the test data entered on a test, press Get test data. To display the test results, press Show test results. To repeat an execution with stored data and compare results, press Regression test. To execute with data from different tests and compare differences in results, press Complete test. Additionally, if you want to store function module execution sequences (the same test with different sets of test data or different function modules), follow this procedure:
Calling Function Modules Remotely with Remote Function Call (RFC) Once in the initial Test Function Module screen, and before executing the test, press Test sequence or select the menu option Goto Test sequence. Perform regular test execution (if you want to change function module, select the option Function modules Other func. Module and enter the name of the function module). To finish the test sequence, select the menu option Edit New sequence. The management and control of the test sequence can be performed from the initial Test Function Module as a unit (by pressing Test seq. Directory) or for every execution of the sequence (by pressing Test data directory). Finally, the function builder can also be used for performing runtime analysis of function modules. To do this, users only have to activate the runtime analysis from the function builder initial screen by selecting the menu option Environment Test environment Runtime analysis. Then users enter the import/changing parameter data and press the Runtime analysis button. The system executes the function module and stores the performance data in performance files that are used by the ABAP runtime analysis (transaction code SE30), and takes users to the SE37 transaction for analyzing the information.
Calling Function Modules Remotely with Remote Function Call (RFC)
For SAP R/3 systems to perform the role of RFC function server, two requirements must be met: 1. The offered functions (function modules) must be defined for allowing RFC calls. This is achieved by setting the Remote Function Call supported radio button in the Administration tabstrip of the function module. 2. External client programs must call the corresponding function module using the RFC APIs. For these requirements, the function builder includes some tools to help to create external programs (RFC clients or servers). From the function module import/export screens (in change mode), select Utilities RFCinterfase Generate to obtain C and Visual Basic template programs for programming RFC clients or servers.
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