门面模式

Author: drinkagain

17-facade/README.md

@@ -0,0 +1,14 @@
+### 门面模式
+
+#### 二个角色：
+
+- Facade 门面角色
+
+    客户端可以调用这个角色的方法。此角色知晓子系统的所有功能和责任。
+    一般情况下，本角色会将所有从客户端发来的请求委派到相应的子系统去，也就说
+    该角色没有实际的业务逻辑，只是一个委托类。
+- Subsystem 子系统角色
+
+    可以同时有一个或多个子系统。每一个子系统都不是一个单独的类，而是一个类的
+    集合。子系统并不知道门面的存在。对于子系统而言，门面仅仅是另外一个客户
+    端而已。

17-facade/pom.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-design-patterns</artifactId>
+        <groupId>com.jiuxian</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.jiuxian</groupId>
+    <artifactId>17-facade</artifactId>
+</project>

17-facade/src/main/java/com/jiuxian/definition/1.png

@@ -0,0 +1,17 @@
+package com.jiuxian.definition;
+
+/**
+ * @author: liuzejun
+ * *
+ * @email: 857591294@qq.com
+ * *
+ * @date: 2019-05-30 10:59:41
+ * *
+ * @description: 子系统A
+ **/
+public class ClassA {
+
+    public void doSth() {
+        System.out.println("子系统A 业务逻辑。。");
+    }
+}

17-facade/src/main/java/com/jiuxian/definition/ClassA.java

@@ -0,0 +1,17 @@
+package com.jiuxian.definition;
+
+/**
+ * @author: liuzejun
+ * *
+ * @email: 857591294@qq.com
+ * *
+ * @date: 2019-05-30 10:59:41
+ * *
+ * @description: 子系统B
+ **/
+public class ClassB {
+
+    public void doSth() {
+        System.out.println("子系统B 业务逻辑。。");
+    }
+}

17-facade/src/main/java/com/jiuxian/definition/ClassB.java

@@ -0,0 +1,17 @@
+package com.jiuxian.definition;
+
+/**
+ * @author: liuzejun
+ * *
+ * @email: 857591294@qq.com
+ * *
+ * @date: 2019-05-30 10:59:41
+ * *
+ * @description: 子系统C
+ **/
+public class ClassC {
+
+    public void doSth() {
+        System.out.println("子系统C 业务逻辑。。");
+    }
+}

17-facade/src/main/java/com/jiuxian/definition/ClassC.java

@@ -0,0 +1,29 @@
+package com.jiuxian.definition;
+
+/**
+ * @author: liuzejun
+ * *
+ * @email: 857591294@qq.com
+ * *
+ * @date: 2019-05-30 11:00:46
+ * *
+ * @description: 门面对象
+ **/
+public class Facade {
+
+    private ClassA a = new ClassA();
+    private ClassB b = new ClassB();
+    private ClassC c = new ClassC();
+
+    public void methodA() {
+        a.doSth();
+    }
+
+    public void methodB() {
+        b.doSth();
+    }
+
+    public void methodC() {
+        c.doSth();
+    }
+}

17-facade/src/main/java/com/jiuxian/definition/Facade.java

@@ -0,0 +1,21 @@
+package com.jiuxian.definition;
+
+/**
+ * @author: liuzejun
+ * *
+ * @email: 857591294@qq.com
+ * *
+ * @date: 2019-05-30 11:02:24
+ * *
+ * @description: 场景类
+ **/
+public class Main {
+
+    public static void main(String[] args) {
+        Facade facade = new Facade();
+
+        facade.methodA();
+        facade.methodB();
+        facade.methodC();
+    }
+}

17-facade/src/main/java/com/jiuxian/definition/Main.java

@@ -0,0 +1,21 @@
+package com.jiuxian.example;
+
+/**
+ * @author: liuzejun
+ * *
+ * @email: 857591294@qq.com
+ * *
+ * @date: 2019-05-30 11:23:24
+ * *
+ * @description: 写信过程接口
+ **/
+public interface ILetterProcess {
+
+    void writeContext(String context);
+
+    void fillEnvelope(String address);
+
+    void letterIntoEnvelope();
+
+    void sendLetter();
+}