Mind Mapping
Introduced
Re-organize your functions in the "refactoring-improve existing code Design" section of PHP above, and continue to talk about refactoring.
Professional terminology
Delegate: Delegate
Encapsulate: Package
Introduce: Introducing
Objective
"Deciding where to put the blame"-using refactoring to change the original design.
Explain:
1, class bear too much and bloated--extract class will part of the responsibility to separate out.
2, class irresponsible--inline class to integrate it into another class.
3. Class uses another Class--hide delegate to hide the relationship.
4, undertake (3) Delegate class often change--remove middle man.
Move Method
If a method in one class has a lot of communication with another class, then we create a new function with similar function in another class, turning the old function into a simple delegating Method, or removing the old function.
Class Diagram:
Motivation:
1. If a class has a high degree of coupling with another class, I move the Method. --class is simpler and cleaner to achieve the task of system delivery.
2, to move some of the range, it is necessary to check whether the use of another class must use the number of objects in the number of times more.
Move Field
Status: The field in your class is used more by another class. Then create a new field in another class and modify the old field.
Extract Class
Status: A class does two classes of things, then a new class is created to move the relevant field and method from the old class to the new class.
Inline Class
Status: One of your
Class
Did not do too many things (not assuming sufficient responsibility), then will
Class
all the features moved to another
Class
and remove the original
Class
.
Motive:
Inline Class
with the
Extract Class
instead. --Put
Extract Class
example against the past because
PhoneNumber
only as Read
Code
and the
Number
.
Hide Delegate
Status: Customer calls directly
Server Object
of the
Delegate Class
of the
Method
, then in
Server
to build the functions required by the client
Method
to hide the delegate relationship.
people who have studied the technology of the object know that although
PHP
allows you to
Field
declared as
Public
, but you should also hide
Field
(
Private
). As experience grows richer, there are more things to encapsulate.
Take a look at the following example:
$person->getdepartment ()->getmanager () clearly revealed that to find XIAOCAI leadership, we had to go through department, so we had to do something to hide department. --can reduce coupling.
Remove Middle Mans
Status: If a
Class
have done too much of
Simple Delegate
, then we call directly
Delegate Class
.
Motive: In
Hide Delegate
in the example where
Department
when there are more new ways, we are trying to
Hide Delegate
, we must be in
Person
add the appropriate method to do
Delegate
the use of. At this time
Person
completely turned into a
Middle Mans
, we should call directly at this point
Delegate Class
--
Department
.
The meaning of refactoring is that you never have to say you're sorry, as long as you fix the problem in the right place.
Introduce Foreign Method
Status: There is an extra function in the class Previousend that the class client needs to use, but you cannot modify the class Previousend, then you create a function in the client and use a previousend entity as the argument.
Summarize
Note that the "Extract class" and "Inline class", "Hide Delegate" and "Remove Middle man" are the opposite process, in particular, you can read the preface of the flowchart.
"Hide Delegate" we used to use a small amount of "Delegate method", and "Remove middle man", used to invoke a lot of "Delegate method" when we can directly use Delegate Class , make a call, and some delegate method we keep as part of the situation.
"Extract class" and "inline Class", "Extract class" are often used in classes that take on too much responsibility and become bloated, while the "inline class" is often used when the current class is "too irresponsible". Personally, I would rather "Extract class" than "Inline class".
Excerpt from Chuanshan Armour
http://www.bkjia.com/PHPjc/478312.html www.bkjia.com true http://www.bkjia.com/PHPjc/478312.html techarticle Mind Map Introduction to undertake the above PHP "refactoring-improve the existing code design" to reorganize your function, continue to say refactoring content. Professional terminology delegate: Entrust eNCA ...
