ABAP

ABAP help文档里对**LOAD-OF-PROGRAM"的关键字是这样描述的：

This event keyword defines the program constructor of an executable program, a module pool, a function group, or a subroutine pool. The program constructor is an event block whose event is raised by the ABAP-runtime environment when one of the executable programs mentioned above is loaded into the internal session.

以Function group为例，每当一个function group里的任意一个function module第一次被调用时，对应的ABAP program被加载到internal session里，同时ABAP运行时抛出LOAD-OF-PROGRAM, 执行应用程序员编写的事件处理逻辑。

现在我有一个名为ZTOMCAT的function group。其LOAD-OF-PROGRAM就负责弹出调试器。

我有两个report。Report 2的源代码：

REPORT ZJERRY_RE2.

call FUNCTION 'ZTEST_FM_1'.

Report 1:

CALL FUNCTION 'ZTEST_FM_1'.

SUBMIT zjerry_re2 AND RETURN.

那么我执行report1，断点会触发一次还是两次？

答案是两次。

LOAD-OF-PROGRAM在这种场景下的行为，ABAP help已经说的很清楚了：

When a program is called using SUBMIT or using a transaction code, a new internal session is opened in every call and the event block is executed once in every call.

每次program通过SUBMIT或者事务码的方式调用时，会起一个新的internal session，在此新的session里LOAD-OF-PROGRAM会触发一次。

下图也直观表明了每次调用SUBMIT( calling programs）时会新起一个Internal Session。