A learning journey based on design patterns
-----
Observer
Mode
1,
Initial observer Mode
In a time when the network was not so developed, many people wanted to know that the weather forecast for the next day had to watch live TV at the specified time, but sometimes they wanted to watch the weather and found that live TV had passed. This is really an unpleasant thing.
Based on this situation, M
together, a D A p T e r mode a D A p T e r is usually used after the system design is complete, and b R i d g e mode You must know beforehand that an abstraction will have more than one implementation part, so is used Therefore, it can be seen from the above description that the use of a bridge or The completed code for the adapter pattern can be viewed as a bridging mode from different viewing angles, or as an adapter mode. 6. Combination Mo
Simple Design Mode
Introduction
Gof (Gang of Four, which refers to Erich Gamma, Richard Helm, Ralph Johnson John vlissides)'s design patterns (published in 1995) this is the first time that we have elevated the design pattern to a theoretical level and standardized it. This book proposes 23 basic
Chapter 9 of the introduction to PHP design patterns Chapter 9 observation patterns some object-oriented programming methods provide a capability to build complex network interconnection between objects. When objects are connected together, they can provide services and information to each other. Generally, when the status of an object changes, you still need to
service name map collection to obtain the corresponding servicefetcher object, and then call Servicefetcher object getservice function obtains servicefetcher The service management object that the object creates. In the getService function of the servicefetcher object, first from the list of Cache arrays maintained by the Context servicefetcher whether an index lookup for an object already includes a service management object created by the Servicefetcher object, and if a service manageme
Java design patterns ------- factory patterns
Java design patterns -------- factory patterns
Classification and Definition 1) Simple Factory: Also known as the Static Factory Method mode, which belongs to the class creatio
relatively single; when we find that a class takes on too many tasks, Too miscellaneous should assign some responsibilities to other classes, so as to guarantee the high cohesion of the design scheme
Controller mode: The controller mode requires that the coordinate processing system messages be assigned to different control classes
Polymorphism: When a duty behaves differently in different derived classes, we can use polymorphic
without modifying the existing code.
The difference between using wrapper mode and using inheritance: Using wrapper mode to dynamically add behavior, using inheritance is static and is determined at compile time. Assuming that the inheritance pattern is used, you must write a special class for each possible combination of behaviors, that is, the kind of behavior that your code can represent is determined by the class you are designing, and the customer cannot get a combination of
change.Beverage.prototype.customerWantsCondiments =function(){ return true;//seasoning is required by default }; Beverage.prototype.init=function(){ this. Boilwater (); this. Brew (); this. Pourincup (); if( this. customerwantscondiments ()) {//If the hook returns true, the seasoning is required this. Addcondiments (); } };Do you really need to "inherit"?The template method pattern is one of the few inheritance-based desig
developers, never care about these behaviors. The code is as follows:JavaScript var address = (function// address module function(obj) { Address.refresh (obj); }); return { function(avatar) { console.log (' Refresh receipt address List ');} } ;}) ();Advantages and Disadvantages
Supports simple broadcast communication and automatically notifies all subscribed objects;
After page loading publishers can easily have a dynamic association wi
This article references:: Geekband classroom content, Instructor: Li Jianzhong: Network information: http://blog.csdn.net/hguisu/article/details/7556625This article only as own study note, does not represent the authority, because is the beginner, has the mistake to please everybody correct, thanks.1, what is the Observer mode, where are the application sites?The Observer pattern (sometimes called the publish-subscribe subscribe> mode, model-view view> mode, source-listener listener> mode, or sl
The essentials and patterns of software design (version 2nd) is the book on software design and design patterns published by Zhang Yi of garden in April this year. I got it in late May and read a chapter every night, after reading chapter 28 of the book on and off last night
on request: Anyone who has used a servlet knows that, in addition to having a corresponding configuration in Web. xml, it is necessary to inherit an abstract class called httpservlet, and rewrite the Doget and Dopost methods (and, of course, just rewrite the service method).Many of the methods in the request object are used when the internal components interact with each other, such as setcomet, setrequestedsessionid, etc. (not listed here). These methods are not exposed externally, but must b
Php design patterns-Abstract factory patterns
Provides an interface for creating a set of related or interdependent objects without specifying their specific classes.
Features
Abstract Factory is a common software design model that provides a unified creation interface for a product family. When you need a seri
) {objectstructure o=new objectstructure (); Attach (New Concreteelementa ()); O. Attach (New Concreteelementb ()); ConcreteVisitor1 v1=new ConcreteVisitor1 (); ConcreteVisitor2 v2=new ConcreteVisitor2 (); O.accept (v1); O. Accept (v2);//If the newly added operation is//concretevisitor3 v3=new ConcreteVisitor3 () as the following code; O.accept (v3);}Okay, now think about what time we use this model? In general, when the data structure is relatively stable, we use this pattern to encode, t
parametric construct, generates an object A through the new keyword, and then produces a new object T by A.clone (), then the constructor is not used when the object is copied. Be executed. That is, only one construction method is executed during the copy process.Clone vs final two pair of enemies. The object's clone is caused by a conflict with the final property within the object. In the programmer class above, modify to private final address address; Remove Get,set method, proto.address= (Ad
(); Ocar.excet (); }}Template method Pattern Applicable scenario
One-time implementation of an invariant part of the algorithm, and the variable behavior is left to subclass to achieve.
The public behavior in each subclass should be extracted and centralized into a common parent class to avoid code duplication. This is a good example of what Opdyke and Johnson described as "re-factoring to generalize." First identify the differences in the existing code and separate the differen
Design Patterns learning notes -- Abstract Factory patterns
After several days of struggle, I finally understood some differences between the abstract factory and the factory method model.
Abstract Factory is similar to the factory method mode. They all follow the open-closed principle and use the factory interface to create a derived factory and then create th
Design Patterns ---- adapter patterns
Converts an interface of a class to another interface that the customer wants. The Adapter mode allows the classes that cannot work together due to incompatibility of interfaces to work together.Solved problems:
That is, the Adapter mode makes those classes that cannot work together due to interface incompatibility work tog
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.