topic singleton class in OO ABAP in Application Development and Automation Discussions

singleton class in OO ABAP

Former Member — Mon, 06 Oct 2014 14:59:02 GMT

Hi Team,

Can you please explain about singleton class and when we will use singleton class in OO ABAP.

Thanks

Hemasagar.

Re: singleton class in OO ABAP

former_member156446 — Mon, 06 Oct 2014 15:27:01 GMT

Often, there is a requirement that you would want to create only one instance of the class. To put it in other words, you do not want any one to create instance of the class if already created.

http://wiki.scn.sap.com/wiki/display/ABAP/SINGLETON+CLASSES

Re: singleton class in OO ABAP

former_member183804 — Tue, 07 Oct 2014 20:26:52 GMT

Hello Kosuru,

in the ABAP Unit Wiki there is a page with some basic explanation of the Singleton pattern.

UnitSu.GoF.Singleton Pattern - ABAP Development - SCN Wiki

Hope this helps

Klaus

Re: singleton class in OO ABAP

thirus11 — Thu, 16 Jul 2015 06:45:08 GMT

Hi Hemasagar,

The concept of restricting the instantiation of the a class to one object is called Singleton.

As name suggests, it will restrict to create only one instance of a class.

Singleton is OO design Pattern. When you implement this pattern in the class it becomes Singleton Class.The usage of this singleton design pattern is purely based on your requirement. For example in a program if your logic is inside a loop and you are creating the object in a loop. Here you can make you use of the singleton design pattern to restrict it to create more than one object.

Regards,

Thiru

Re: singleton class in OO ABAP

Former Member — Thu, 16 Jul 2015 08:42:10 GMT

Hi Hemasagar Kosuru,

Sometime's we need only one instance for a class at that time, we go for singleton concept in ABAP objects.

Thanks and regards,

B.Umayaraja