Design Patterns
Creational Pattern
Factory Method 工場パターン
Provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.
Abstract Factory 抽象工場
Lets you produce families of related objects without specifying their concrete classes.
Builder ビルダーパターン
Lets you construct complex objects step by step. The pattern allows you to produce different types and representations of an object using the same construction code.
Prototype プロトタイプパターン
Lets you copy existing objects without making your code dependent on their classes.
Singleton シングルトンパターン
Lets you ensure that a class has only one instance, while providing a global access point to this instance.
Structural Pattern
Adapter アダプターパターン
Allows objects with incompatible interfaces to collaborate.
---
title: Go Adapter Example
---
classDiagram
class XMLData {
}
class JSONData {
}
class XMLService {
+ParseXML(xmlData []byte)
}
class XMLToJSONAdapter {
-xmlService *XMLService
+ConvertToJSON(xml []byte)
}
class Client {
-xmlService *XMLService
-xmlToJSONAdapter *XMLToJSONAdapter
+ProcessXMLData(data []byte)
+ProcessJSONData(data []byte)
}
XMLService *.. XMLToJSONAdapter
XMLService ..> XMLData
XMLToJSONAdapter ..> JSONData
Client ..* XMLToJSONAdapter
Client ..* XMLService
Bridge ブリッジパターン
Lets you split a large class or a set of closely related classes into two separate hierarchies—abstraction and implementation—which can be developed independently of each other.
Composite コンポジットパターン
Lets you compose objects into tree structures and then work with these structures as if they were individual objects.
Decorator デコレーターパターン
Lets you attach new behaviors to objects by placing these objects inside special wrapper objects that contain the behaviors.
Facade ファサードパターン
Provides a simplified interface to a library, a framework, or any other complex set of classes.
Flyweight フライウェイトパターン
Lets you fit more objects into the available amount of RAM by sharing common parts of state between multiple objects instead of keeping all of the data in each object.
Proxy プロキシパターン
Lets you provide a substitute or placeholder for another object. A proxy controls access to the original object, allowing you to perform something either before or after the request gets through to the original object.
Behavior Pattern
Observer オブザーバーパターン
Lets you define a subscription mechanism to notify multiple objects about any events that happen to the object they’re observing.
Strategy ストラテジーパターン
Lets you define a family of algorithms, put each of them into a separate class, and make their objects interchangeable.
Chain of Responsibility 責任連鎖パターン
Lets you pass requests along a chain of handlers. Upon receiving a request, each handler decides either to process the request or to pass it to the next handler in the chain.
Command コマンドパターン
Turns a request into a stand-alone object that contains all information about the request. This transformation lets you pass requests as a method arguments, delay or queue a request’s execution, and support undoable operations.
Iterator イテレーターパターン
Lets you traverse elements of a collection without exposing its underlying representation (list, stack, tree, etc.).
Mediator メディエーターパターン
Lets you reduce chaotic dependencies between objects. The pattern restricts direct communications between the objects and forces them to collaborate only via a mediator object.
Memento メメントパターン
Lets you save and restore the previous state of an object without revealing the details of its implementation.
State ステートパターン
Lets an object alter its behavior when its internal state changes. It appears as if the object changed its class.
Template Method テンプレートメソッドパターン
Defines the skeleton of an algorithm in the superclass but lets subclasses override specific steps of the algorithm without changing its structure.
Visitor ビジターパターン
Lets you separate algorithms from the objects on which they operate.
Interpreter インタープリターパターン
Given a language, define a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language.