Book Image

Mastering SAP ABAP

By : Paweł Grześkowiak, Wojciech Ciesielski, Wojciech Ćwik
Book Image

Mastering SAP ABAP

By: Paweł Grześkowiak, Wojciech Ciesielski, Wojciech Ćwik

Overview of this book

Advanced Business Application Programming (ABAP) is an established and complex programming language in the IT industry. This book is designed to help you use the latest ABAP techniques and apply legacy constructions using practical examples. You'll start with a quick refresher on language and database concepts, followed by agile techniques for adding custom code to a modern ABAP system. After this, you will get up to speed with the complete ABAP toolset for importing data to and from different environments. Next, you'll learn how to print forms and work with the different ABAP tools for Extensible Markup Language (XML) manipulation. While covering further chapters, you'll gain insights into building stunning UI5 interfaces, in addition to learning how to develop simple apps using the Business Object Processing Framework (BOPF). You will also pick up the technique of handling exceptions and performing testing in ABAP. In the concluding chapters, you can look forward to grasping various techniques for optimizing the performance of programs using a variety of performance analysis tools. By the end of this book, you will have the expertise you need to confidently build maintainable programs in Systems, Applications, and Products (SAP).
Table of Contents (25 chapters)
Title Page
Copyright and Credits
Dedication
About Packt
Contributors
Preface
Index

The event concept


Events in ABAP are characterized by occurring at a specified point of time. An event can be executed, for, example when we create a new account or post a document, and, if the event includes changing the status of an object, another interested object will be informed of the situation.

To every event, we can assign a method, which will be called when the event is raised. We can also assign the same event handler to a different object and, thanks to that, the object will be able to react when an event is raised. In contrast to methods that affect only the process in which they are called, an event can cause any number of event handlers to be called globally.

If several event handlers are registered for one event, these are called in the sequence in which they were registered. An event can also have output parameters, which are defined using the normal method. Event handlers can also be called directly. This is helpful when you want an event handler to handle an event without...