flyweight designs

To explain the concept, if there are multiple identical objects in a system, you can share only one object without instantiating one object. For example, in a text system, each letter is an object, so there are 52 uppercase and lowercase letters, so 52 objects must be defined. If there is a 1 m text, then there are many letters. If each letter defines an object, the memory will have exploded. Therefore, if each letter shares an object, the resource is greatly reduced.In the

The Flyweight pattern is used primarily to reduce the number of objects created to reduce memory footprint and improve performance. This type of design pattern is a structured pattern that provides a way to reduce the number of objects to improve the object structure required for application. The enjoy meta mode attempts to reuse an existing homogeneous object and create a new object if no matching object is found. The implementation of a string in Ja

Enjoy meta mode (English: Flyweight pattern) is a software design pattern. It uses shared objects to minimize memory usage and to share information to as many similar objects as possible, and it is suitable for a large number of objects that are simply duplicated to use an unacceptable amount of memory. Usually part of the state in an object can be shared. It is common practice to put them in an external data structure and pass them on to the element

Explain the concept: that is, if there are multiple identical objects in a system, it is possible to share only one copy, without having to instantiate an object each. For example, a text system, each letter set an object, then the big lowercase letters are altogether 52, then you need to define 52 objects. If there is a 1M of text, then the letter is much more, if each letter is defined an object then the memory is already exploded. So if you share an object with each letter, you save a lot of

This article describes the Java design pattern of the sharing meta-mode. Share to everyone for your reference, as follows:Explain the concept: that is, if there are multiple identical objects in a system, it is possible to share only one copy, without having to instantiate an object each. For example, a text system, each letter set an object, then the big lowercase letters are altogether 52, then you need to define 52 objects. If there is a 1M of text, then the letter is much more, if each lette

definition. is a class diagram that simply enjoys meta-mode:In the simple-to-enjoy model, an abstract interface is needed to specify the methods that are required for all the specific privileges. The implementation is as follows:Flyweight.javapublicinterface Flyweight { publicvoidoperation(String state);}For the Concreteflyweight section, the share must be shareable, any state it holds must be internal (intrinsic), and Concreteflyweight must be in

The object-oriented thinking solves the abstract problem well, and generally does not have performance problems. However, in some cases, the number of objects may be too large, resulting in the runtime cost. So how can we avoid a large number of fine-grained objects without affecting the use of object-oriented operations by customer programs? Metadata mode:Use sharing technology to effectively support a large number of fine-grained objects Structure: Explanation: Flyweightfactory: A meta

, so new a white pieces; when another player puts the first black piece, there is no black pawn, so a new black piece is needed. When the player again put a white piece, to inquire whether there are already existing white pieces object, because the first time has been new a white pawn object, so, now will not be new again a white piece object, but return to the previous new white piece object; for black pieces, it's the same thing. , we only need to set the different board positions of the piece

organizes objects into the tree structure and can be used to describe the relationship between the whole and the part. The merging mode is a tree structure mode for processing objects. The merging mode shows the relationship between the part and the whole in a tree structure. The merging mode allows the client to view individual component objects in the same way as the compositing objects composed of them.　　 9. After decorator-Mary's birthday ends, do not ask her to pick it up. OtherwiseThe mon

has only one instance, meaning it is a singleton pattern. But the entire system can have multiple façade classes. FLYWEIGHT (enjoy meta mode)Interesting: Every day with the mm text messages, fingers are exhausted, recently bought a novice machine, you can put some commonly used sentences exist in the cell phone, to use the time, directly out, in front with the name of the MM can be sent, do not use a word a word knocked. The shared sentence is tha

long-term desirability of using the original components to construct new solutions.4. Four basic elements of a design patternDesign patterns make it easier and easier for people to reuse successful designs and architectures. The presentation of proven technologies into design patterns will also make it easier for new system developers to understand their design ideas.All design patterns have some common features: an identity (a pattern name), a probl

design patternDesign patterns make it easier and easier for people to reuse successful designs and architectures. The presentation of proven technologies into design patterns will also make it easier for new system developers to understand their design ideas.All design patterns have some common features: an identity (a pattern name), a problem statement (a problem statement), and a solution (a solution), effect (Consequences)pattern Name: The problem

In the book "Java and Patterns" of Dr. Shanhong, this describes the Flyweight pattern:Flyweight in boxing is the most lightweight, that is, "The fly level" or "rainfall level", where the choice to use the "enjoy meta-mode" of the free translation, because it is more reflective of the intention of the model. The enjoy meta mode is the structure mode of the object. The enjoy meta mode efficiently supports a large number of fine-grained objects in a shar

, we should understand, because this diagram is the principle of our JDBC connection, there is the basis of database learning, a combination of all understand. 11. Combination mode (composite) The combination pattern is sometimes called a partial-integral mode to handle problems similar to the tree structure, and look at the diagram:Look at the code directly: public class TreeNode {private String name; Private TreeNode parent; Private vector Working with scenarios: combining mul

The meaning of the design pattern lies in: Facing the business content, the business data structure and the system architecture, the cohesion is low-coupling, graceful the plane logic three-dimensional.1 PackageDesignpattern;2 ImportJava.util.HashMap;3 ImportJava.util.Map;4 5 /**6 * Enjoy meta mode7 * @authorAdministrator8 */9 Public classB14_flyweighttest {Ten One /** A * Use sharing technology to effectively support a large number of fine-grained objects. - * Applicable to: - * 1. An

Enjoy meta mode (Flyweight): Use sharing technology to effectively support a large number of fine-grained objects. Four role classes: Flyweight: The superclass or interface of all the specific classes of the class, through which the flyweight can accept and act on the external state. Flyweight to enjoy meta-factory

Use enjoy meta mode (Singleton) Use shared technology to effectively support a large number of fine-grained objects. structureGraph-Enjoy meta-mode structure diagramflywight : It is the superclass or interface of all the specific classes of the class, through which the Flyweight can accept and act on the external state.AbstractclassFlyweight { PublicAbstractvoidOperation (intExtrinsicstates);}concreteflyweight : is to inherit the

This. Values[idx]; Break; }}}hashtable.prototype.set=function(key, value) {if( This. Contain (key)) { This.Delete(key); This. Values.push ({key:key,value:value}); }}2. Enjoy the meta-method:function Flyweight (one) { this. Stateone = one ; function() {var New Date (); Console.log (this. Stateone + '-' + math.random ());};Here you can handle some of the arguments passed in the logic, you can also initialize the data from the databas

interface, which makes the subsystem easier to use. 19, Proxy, Agent mode: For other objects to provide a proxy to control access to this object 20, Adapter, adapter mode: To convert a class of interfaces to another interface that the customer wants, Adapter mode makes it impossible to work together those classes that are incompatible with the interface. 21, Decrator, Decoration mode: Dynamically add some additional responsibilities to an object, the decorator mode is more flexible than

avoid exposing information that should only be managed by the original and that must be stored outside of the original sender. This mode masks potentially complex orignator internal information against other objects, preserving the encapsulation boundary. It simplifies the original generator in other packaging-preserving designs, and originator is responsible for maintaining the internal state version requested by the customer. This gives all the