vsan observer

The observer mode is a behavior mode that defines a one-to-many dependency between objects so that when the state of an object changes, all objects dependent on it are notified and automatically refreshed. Concept The observer mode is a behavior mode that defines a one-to-many dependency between objects so that when the state of an object changes, all objects dependent on it are notified and automatically r

Definition: Defines a one-to-many dependency between objects so that when each object changes state, all objects that depend on it are notified and updated automatically.Type: Behavior class pattern.Class Diagram:This is often required in software systems: if the state of an object changes, certain objects associated with it change accordingly. For example, we want to design a right-click menu function, as long as the software in the active area of the right mouse button, we will pop up a menu,

GnuhpcSource: http://www.cnblogs.com/gnuhpc/1. We need to understand the relationship between the newspaper, the subscription system and the Subscribe people, subscribe through the subscription system subscribe, once the newspaper has a new newspaper, the subscription system will be sent or mailed to subscribe people new newspapers. Then, the Publisher + Subscriber is the Observer pattern, but the name is not the same, the subject (Subject, or observa

Ubiquitous design Patterns in Android development--the ubiquitous design pattern--builder pattern in the single case model Android development The previous introduction of the single case mode and builder mode, interested in see the above two links, this article focuses on the Observer model. Let's look at the definition of this pattern first. Defines a one-to-many dependency between objects, and when the state of an object is sent to change, all obje

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. The two are encapsulated in separate objects so that they can be individually changed and reused.When a change to an object needs to change other objects at the same time, it is not known how many objects need to be changed.When an object must notif

There have been a lot of online sharing and notes on the design model. I am still writing this article about nothing new. This is mainly to record my recent learning and life, in addition, I hope to use this blog post to restart my blog to fill my life. I haven't written anything for a long time. I have been watching my blog for a long time and looking back at the blank days of my memory, I felt a little scared. after such a long period of time, I did not even leave any trace. My existence was t

If the admin wants to observe user's salary change, when the user's salary increases or decreases, will cause the admin to output the corresponding information.Defining the Observer Interface: Myobserver.java Package Cn.liuning.watch; Public Interface myobserver { void update (myobservable o, Object arg);}View CodeDefine the observed parent class (the Admin class needs to inherit this class): Myobservable.java PackageCn.liuning.watch;ImportJava.u

The Observer pattern is also known as the publish-subscribe mode, which is designed to solve the coupling between the subject object and the Observer's function. Publishers and Subscribers are non-intrusive, unconnected, and through observers, as intermediaries, connect the two.Example: Taking the student and teacher as an example1. First create the Observer objectPlace the

C # design pattern-Observer PatternPreface recently, I began to focus on the design pattern, mainly to make the code written by myself highly reusable and ensure code reliability. The so-called design pattern is defined by me as a summary of code design experiences that have been repeatedly used, known to most people, classified and catalogued. There is no doubt that the design pattern is win-win for others and the system; The design pattern enables c

An object becomes observability by adding a method (This method allows another object, that is, the observer registers itself. When an observed object changes, the message is sent to the registered observer. This article introduces the Observer Pattern of PHP design patterns. If you need a friend, refer to the concepts of obs