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 <header>
 
 <time datetime="2021-05-25T12:17:16+09:00">2021-05-25</time> by Dennis in 
&nbsp;<a href="/categories/tech" rel="category tag">tech</a>


&nbsp;<a href="/tags/java" rel="tag">java</a>, <a href="/tags/design-pattern" rel="tag">Design Pattern</a>


 </header>
 (Java 디자인 패턴 스터디 모집 중 : <a href="https://github.com/bluedskim/javaDesignPatterns">https://github.com/bluedskim/javaDesignPatterns</a>)
<h2 id="facade-패턴-다이어그램">Facade 패턴 다이어그램</h2>
<img src="https://media.geeksforgeeks.org/wp-content/uploads/facadeA.png" alt="Facade Design Pattern | Introduction" title="Facade Design Pattern | Introduction">
(출처:<a href="https://www.geeksforgeeks.org/facade-design-pattern-introduction/">https://www.geeksforgeeks.org/facade-design-pattern-introduction/</a>)
<h2 id="해결하려는-문제">해결하려는 문제</h2>
<ol>
<li>클라이언트에서 다른 객체들로의 참조들을 분리하여 클라이언트의 의존성을 줄이고 복잡성을 관리.</li>
</ol>
<h2 id="특징용도">특징/용도</h2>
<ol>
<li>구조적structural 디자인 패턴</li>
<li>클라이언트에 Facade라는 단순화 된, 필요한 기능만 접근할 수 있는 레이어를 추가</li>
<li>서드파티 라이브러리에 대한 직접적 의존성을 제거하여 교체를 쉽게 한다.</li>
<li>facade는 캡슐화된encapsulated 블랙박스.</li>
</ol>
<h2 id="구성요소">구성요소</h2>
<ol>
<li>facade : target의 여러 인터페이스를 조합한 루틴이 정의된 객체</li>
<li>target : 원래는 클라이언트가 직접 참조해야 하는 객체</li>
<li>client : facade를 통해 target들을 사용(호출)하는 객체</li>
</ol>
<h2 id="고려사항">고려사항</h2>
다른 유사한 패턴을 사용할 수도 있다.
<ol>
<li>Decorator : 원래의 소스를 감싸는 방식으로 인터페이스에 동적으로 기능을 추가한다.</li>
<li>Delegation : 상속을 통한 조합</li>
<li>Adapter : 어떤 인터페이스를 다른 인터페이스로 변환</li>
</ol>
<h2 id="클래스-다이어그램">클래스 다이어그램</h2>
<img src="https://www.plantuml.com/plantuml/png/VPBFIyCm5CVFvgy80zbsM7iV8XkAx38Gvp_mrhorSKbRazV9K45XDmNnAAZd7HMy-2_DxdymNSVeK9RZzqVoUOzqB86XJ2lU5P0I6hvyd2zdNut5zztFqqi-Usio5ac177LAKwvH3z7OROcYH5Z6I992VW81EE_lDH4wtV28ABLjtmybHTdG2nBj3rM6mewbzYzW0iTePHYV0ZcQsB9HaXHO-VjpFllC7ruN7_TyNm1XepPrn-ltFI7glDxhjRMkELecOrSOGO1y446A_9hj3SZ8EEJ2m5MZoMuP2nHOou-a2TIkm1a6176uCpEupC3i31GKVHYxARP3NQLMtl_XSxHK52Q951Mvt6zXbhLoneCRprkFKrKs_5Mn15utIwvMwx1yeggk03REIcAiWx5mt-KN" alt="Adapter 패턴(김동석)" title="Adapter 패턴(김동석)">
<h2 id="소스">소스</h2>
<ol>
<li>facade : ShapeMaker.java
<div>
<table><tbody><tr><td>
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.facade;

/**
 * facade용 클래스
 */
public class ShapeMaker {
	private Shape circle;
	private Shape rectangle;
	private Shape square;

	public ShapeMaker() {
		circle = new Circle();
		rectangle = new Rectangle();
		square = new Square();
	}

	public String drawCircle() {
		return circle.draw();
	}

	public String drawRectangle() {
		return rectangle.draw();
	}

	public String drawSquare() {
		return square.draw();
	}

	/**
	 * 복잡한 로직을 감싼 facade 메소드
	 * @return
	 */
	public String drawAllShape() {
		return circle.draw() + rectangle.draw() + square.draw();
	}
}</code></pre></td></tr></tbody></table>
</div></li>
<li>target : Shape.java, Circle.java, Rectangle.java, Square.java
<ul>
<li>Shape.java
<div>
<table><tbody><tr><td>
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.facade;

public interface Shape {
	String draw();
}</code></pre></td></tr></tbody></table>
</div></li>
<li>Circle.java
<div>
<table><tbody><tr><td>
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.facade;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class Circle implements Shape {

	@Override
	public String draw() {
		String result = "Circle::draw()";
		log.info(result);
		return result;
	}
}</code></pre></td></tr></tbody></table>
</div></li>
<li>Rectangle.java
<div>
<table><tbody><tr><td>
<pre><code> 1
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.facade;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class Rectangle implements Shape {

	@Override
	public String draw() {
		String result = "Rectangle::draw()";
		log.info(result);
		return result;
	}
}</code></pre></td></tr></tbody></table>
</div></li>
<li>Square.java
<div>
<table><tbody><tr><td>
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.facade;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class Square implements Shape {

	@Override
	public String draw() {
		String result = "Square::draw()";
		log.info(result);
		return result;
	}
}</code></pre></td></tr></tbody></table>
</div></li>
</ul>
</li>
<li>client : ShapeMakerTest.java
<div>
<table><tbody><tr><td>
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.facade;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;

public class ShapeMakerTest {

	@Test
	public void ShapeMakerFacadeTest() {
		ShapeMaker shapeMaker = new ShapeMaker();
		assertEquals("Circle::draw()", shapeMaker.drawCircle());
		assertEquals("Rectangle::draw()", shapeMaker.drawRectangle());
		assertEquals("Square::draw()", shapeMaker.drawSquare());
		assertEquals("Circle::draw()Rectangle::draw()Square::draw()", shapeMaker.drawAllShape());
	}
}</code></pre></td></tr></tbody></table>
</div></li>
</ol>
<h2 id="참고">참고</h2>
<ul>
<li><a href="https://en.wikipedia.org/wiki/Facade_pattern">wikipedia : Facade pattern</a></li>
<li><a href="https://www.baeldung.com/java-facade-pattern">baeldung : Facade Design Pattern in Java</a></li>
<li><a href="https://www.tutorialspoint.com/design_pattern/facade_pattern.htm">tutorialspoint : Design Patterns - Facade Pattern</a></li>
</ul>


 

 
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(Java 디자인 패턴 스터디 모집 중 : https://github.com/bluedskim/javaDesignPatterns) Facade 패턴 다이어그램 (출처:https://www.geeksforgeeks.org/facade-design-

Java 디자인 패턴-08.Facade

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