行为型模式：备忘录模式

Author: 1CSH1

src/com/liebrother/designpatterns/memento/MementoTest.java

@@ -0,0 +1,150 @@
+package com.liebrother.designpatterns.memento;
+
+/**
+ * @author James
+ * @date 2019/3/12
+ */
+public class MementoTest {
+
+    public static void main(String[] args) {
+        Deployer deployer = new Deployer();
+        deployer.setApp(new App("apply-system", "1.0.0"));
+
+        System.out.println("1. 暂停旧应用");
+        deployer.stopApp();
+
+        System.out.println("2. 备份旧应用");
+        Space aaa = new Space();
+        aaa.setAppBackup(deployer.createAppBackup());
+
+        System.out.println("3. 拷贝新应用到服务器");
+        deployer.setApp(new App("apply-system", "2.0.0"));
+        deployer.showApp();
+
+        System.out.println("4. 启动新应用");
+        deployer.startApp();
+
+        System.out.println("5. 有异常，暂停新应用");
+        deployer.stopApp();
+
+        System.out.println("6. 回滚旧应用，拷贝备份的旧应用到服务器");
+        deployer.setAppBackup(aaa.getAppBackup());
+        deployer.showApp();
+
+        System.out.println("7. 启动备份的旧应用");
+        deployer.startApp();
+    }
+
+}
+
+
+/**
+ * 系统发布
+ * 1. 关闭应用
+ * 2. 备份应用
+ * 3. 拷贝新应用
+ * 4. 启动应用
+ *
+ * 回滚
+ * 5. 关闭应用
+ * 6. 恢复应用
+ * 7. 启动应用
+ */
+
+class App {
+    private String content;
+    private String version;
+
+    public App(String content, String version) {
+        this.content = content;
+        this.version = version;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public void setVersion(String version) {
+        this.version = version;
+    }
+
+    @Override
+    public String toString() {
+        return "App{" +
+                "content='" + content + '\'' +
+                ", version='" + version + '\'' +
+                '}';
+    }
+}
+
+
+class AppBackup {
+
+    private App app;
+
+    public AppBackup(App app) {
+        this.app = app;
+    }
+
+    public App getApp() {
+        return app;
+    }
+
+    public void setApp(App app) {
+        this.app = app;
+    }
+}
+
+class Deployer {
+
+    private App app;
+
+    public App getApp() {
+        return app;
+    }
+
+    public void setApp(App app) {
+        this.app = app;
+    }
+
+    public AppBackup createAppBackup() {
+        return new AppBackup(app);
+    }
+
+    public void setAppBackup(AppBackup appBackup) {
+        this.app = appBackup.getApp();
+    }
+
+    public void showApp() {
+        System.out.println(this.app.toString());
+    }
+
+    public void stopApp() {
+        System.out.println("暂停应用：" + this.app.toString());
+    }
+
+    public void startApp() {
+        System.out.println("启动应用：" + this.app.toString());
+    }
+
+}
+
+class Space {
+    private AppBackup appBackup;
+
+    public AppBackup getAppBackup() {
+        return appBackup;
+    }
+
+    public void setAppBackup(AppBackup appBackup) {
+        this.appBackup = appBackup;
+    }
+}