singleton class in OO ABAP

[Former Member]

Hi Team,

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

Thanks

Hemasagar.

[former_member156446]

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

[former_member183804]

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

[thirus11]

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

[Former Member]

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