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CS
Singleton pattern is one of the simplest design patterns in Java. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object….
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Design Patterns
Table Of Contents hide 1) Singleton Creational Design Pattern 2) Eager Initialization 3) Static Block Initialization 4) Lazy Initialization 5) Thread Safe Singleton 6) Bill…
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SAP ABAP News \u0026 Updates
Introduction The example below are based on my need to hold and transfer two fields from LIKP. It is easy to expand to hold other table structures or single fields. The datastore could be used to replace the usage of MEMORY ID, which are not very readable / maintanable. A (very) short introduction for those who are not familiar with the singleton design pattern. The singleton design pattern ensures that only one instance of the class is created. The class contains its own constructor, and in this method logic is placed that ensures the creation of only one instance. And now for the fun part. I hav
e documented the code(!), so it should be readable with just screenshots. Class definition The class for the data store: And the O_DATA_STORE attribute: Constructor The constructor for the class is the GET_OBJECT method. Methods And two simple PUT and GET methods for the LIKP structure: Use of class The following is the test program that shows the datastore in use. First the main program: The next level in the call stack: And the last level of the call stack: Conclusion At this point the LIKP-VBELN contains the number 2. This show that our data store object are kept in memory the whole way through the call stack. Please note that if you leave the call stack (i.e. start another report), then you will loose the reference to the object. With this datastore class you can now avoid using MEMORY ID to store and move variables trough the call stack. Further enhancement After the initial build of the class I have enhanced it further, and changed the GET-methods with a return parameter to evaluate if the field has been stored. I also added a RESET-method. This method marks the field as unstored. This has the advantage of being able to check if the field have been initiated. And also to reset the field after it have been retrieved/used. METHOD put_berot. v_berot = i_berot. v_berot_initiated = abap_true. ENDMETHOD. METHOD reset_berot. v_berot = ”. v_berot_initiated = abap_false. ENDMETHOD. METHOD get_berot. e_berot = v_berot. r_berot_initiated = v_berot_initiated. ENDMETHOD.
Design patterns
Creational patterns can categorize into two parts. Those are object-creational patterns and class-creational patterns. Let’s discuss them all.
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