observer interface

　The Observer pattern is the behavior pattern of the object, also called the Publish-subscribe (publish/subscribe) mode, the Model-view (Model/view) mode, the source-listener (Source/listener) mode, or the slave (dependents) mode.The Observer

1. Definition The observer mode is also called the publish-subscribe mode, the Model-View mode, and the source-listener or subordinate mode. A target object manages all observer objects dependent on it. When its status changes, it actively sends a

Concept The observer mode defines the one-to-many dependency between objects. When the State of an object (the observed object) changes, all objects dependent on it (the observer) are notified and automatically updated. The implementation of the

In many cases, experience is crucial for a design (software, building, or industrial. Good experiences give us guidance and save our time. Bad experiences give us reference to reduce the risk of failure. However, in terms of knowledge, experience

It took a long time to understand what it meant. record it for the first time and edit it when you have a deeper understanding. In head. First design patterns, the interpretation of observer patterns is very vivid and easy to understand. But why is

The observer mode defines the one-to-many dependency of an object. in this way, when an object changes its status, all its dependent persons will receive notifications and update them automatically! Introduction The observer mode defines the

GameRes Game Development Resources Network http://www.gameres.com Design the framework of a parallel Game Engine Author: Jeff Andrews Translation: Vincent Contact: QQ: 14173579 MSN: square@sina.com Design a function-breaking, data-decomposing

The Model-View-controller (MVC) structure is an application that provides multiple views for the same data.ProgramDesigned, it achieves the separation between the data layer and the presentation layer. Example:[Img] QuitWe can see that several

Observer Mode Defines a one-to-many dependency between objects. When an object (subject) changes its status, all its dependent (Observer observer) will receive a notification and update it automatically. The one-to-many relationship refers to the

Introduction The observer mode defines the one-to-many dependency of an object. In this way, when an object changes its status, all its dependent persons will receive notifications and update them automatically! Design principles In the observer

definition of the Observer pattern Defines a one-to-many dependency between objects, so that when an object changes state, all its dependencies are notified and updated automatically. The Observer pattern provides an object design that allows the

Viewer design PatternThe Observer pattern defines a one-to-many dependency between objects, so that when an object changes state, all its dependents are notified and updated automatically.Structure of the Observer pattern Abstract theme

Observer pattern: First of all, to understand the definition of the observer pattern, a one-to-many relationship between objects, when one of the object changes [subject], other objects dependent on the object [Observer], will be notified, and

Museum Magic Night! Museum Magic Night! Museum Magic Night!Re-say three!!!After the JVM saw the "Museum Night" movie, he decided to open a museum in his own home! After all, we need something new, and the museum will soonIt's open, and appoint you

Observer Observer pattern (behavioral mode)Motive (motivation)In the process of software building, we need to establish a "notification dependency" for some objects--the state of an object (the target object) is changed, and all dependent objects

Intention:Defines a one-to-many dependency between objects, and when an object's state changes, all objects that depend on it are notified and automatically updated.Applicability:When an abstract model has two facets, one aspect depends on the other.

PS One sentence: Eventually choose Csdn to organize the publication of the knowledge points of these years, the article parallel migration to CSDN. Because CSDN also support markdown grammar, Ah!"Craftsman Joshui Http://blog.csdn.net/yanbober" read

Six major areas:I. The relationship between the target and the observer;Two, one-way dependence:Only the observer relies on the target object; the initiative is here;III. recommendations of the Order:First, the definition of the target interface, it

Today, I learned the observer pattern and made a summary to make it easier to recall later.The first is the definition: The Observer pattern is to define a one-to-many dependency between objects, and when an object state changes, all dependent

1. Parser mode//parser content class//for storing the result of the expression, and can return the results of the original record according to the passed expression class interpretercontext{private $expressionstore =array (); Put the object in an