Categories:
.NET (357)
C (330)
C++ (183)
CSS (84)
DBA (2)
General (7)
HTML (4)
Java (574)
JavaScript (106)
JSP (66)
Oracle (114)
Perl (46)
Perl (1)
PHP (1)
PL/SQL (1)
RSS (51)
Software QA (13)
SQL Server (1)
Windows (1)
XHTML (173)
Other Resources:
What is Concern in AOP
What is Concern in AOP?
✍: Guest
gA concern is a particular goal, concept, or area of interesth
There are mainly two types of concern from an object perspective:-
ã Core / Main concerns which it should satisfy and is his work.
ã System concerns which are not related to business functionalities but software
related concerns example audit trail, Error handling, Security etc.
Ok let us try to understand this principle by some actual example.
Above is a class diagram which shows relationshipbetween two classes “ClsCustomer”
and “ClsAuditTrail”. “ClsCustomer” class does inserting of new customers in to database
and “ClsAuditTrail” does the auditing of what is changed in the customer class.
Now there are two concerns in this project :-
ã Customer code should not exceed than 10 lengths (Business level
concern) greater
ã All customer data which is updated should be audited. (System level concern)
Here goes the class code. If you see the ClsCustomer implementation in the update method
I have called the Audit trail implementation. If you really look from object oriented point
of view we are doing something in customer class which is supposed to be not his
implementation: - Audit Trail logging. Thus we have also broken down the rule of
encapsulation. In short the class not only handles his work but also some other work
which is not his concern.
2007-10-24, 7155👍, 0💬
Popular Posts:
How do we host a WCF service in IIS? Note: - The best to know how to host a WCF in IIS is by doing a...
How To Enter Characters as HEX Numbers? - MySQL FAQs - Introduction to SQL Basics If you want to ent...
How do you target a specific frame from a hyperlink? Include the name of the frame in the target att...
How To Create an Array in PL/SQL? - Oracle DBA FAQ - Introduction to PL/SQL If you want create an ar...
Can you tell me how to check whether a linked list is circular? Create two pointers, and set both to...