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ABENEXCEPTIONS_EVENTS - EXCEPTIONS EVENTS

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Class-Based Exceptions in Event Handlers

Class-based exceptions in event handlers are a special case of class-based exceptions in procedures.

Since event handlers and triggers are completely decoupled from each other, the trigger of an event does not know the handler and therefore cannot handle its exceptions. For this reason, no class-based exceptions can be declared using RAISING in the declaration of event handlers.

This has the following consequences:

• If exceptions of the classes CX_STATIC_CHECK or CX_DYNAMIC_CHECK occur during event handling, they must be handled in the event handler or they lead to a violation of the interface, whereby the exception CX_SY_NO_HANDLER is raised, as in regular procedures.

• If a violation of the interface occurs during event handling, event handling is terminated, and the control is given back to the trigger of the event. Further event handlers which are still registered for the event are not executed.

• The trigger of the event can handle the CX_SY_NO_HANDLER exception.

Notes

• An event handler should handle exceptions of the classes CX_STATIC_CHECK and CX_DYNAMIC_CHECK that are raised during processing. If they are not handled and this leads to a violation of the interface, it is seen as a programming error in the event handling.

• The trigger of an event does not usually have to handle exceptions, unless an exception to the class CX_NO_CHECK is expected. The handling of CX_SY_NO_HANDLER is only considered when trying to prevent a possible programming error in an event handler from producing a runtime error.

• The trigger of an event should not attempt, any more than the caller of a procedure, to handle the original exception after detecting CX_SY_NO_HANDLER. Unlike in direct method calls, it is not yet determined here which method the event has handled.

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