design patterns : proxy

design-pattern/gof/src/proxy/after/Client.java

@@ -0,0 +1,9 @@
+package proxy.after;
+
+public class Client {
+
+    public static void main(String[] args) throws InterruptedException {
+        GameService gameService = new GameServiceProxy();
+        gameService.startGame();
+    }
+}

design-pattern/gof/src/proxy/after/DefaultGameService.java

@@ -0,0 +1,11 @@
+package proxy.after;
+
+public class DefaultGameService implements GameService{
+
+    @Override
+    public void startGame() throws InterruptedException {
+        System.out.println("이 자리에 오신 여러분을 진심으로 환영합니다.");
+        Thread.sleep(1000L);
+    }
+
+}

design-pattern/gof/src/proxy/after/GameService.java

@@ -0,0 +1,6 @@
+package proxy.after;
+
+public interface GameService {
+
+    void startGame() throws InterruptedException;
+}

design-pattern/gof/src/proxy/after/GameServiceProxy.java

@@ -0,0 +1,18 @@
+package proxy.after;
+
+public class GameServiceProxy implements GameService {
+
+    private GameService gameService;
+
+    @Override
+    public void startGame() throws InterruptedException {
+        long before = System.currentTimeMillis();
+        if (this.gameService == null) {
+            this.gameService = new DefaultGameService();
+        }
+
+        gameService.startGame();
+        long after = System.currentTimeMillis();
+        System.out.println(after - before);
+    }
+}

design-pattern/gof/src/proxy/before/Client.java

@@ -0,0 +1,9 @@
+package proxy.before;
+
+public class Client {
+
+    public static void main(String[] args) throws InterruptedException {
+        GameService gameService = new GameService();
+        gameService.startGame();
+    }
+}

design-pattern/gof/src/proxy/before/GameService.java

@@ -0,0 +1,9 @@
+package proxy.before;
+
+public class GameService {
+
+    public void startGame() {
+        System.out.println("이 자리에 오신 여러분을 진심으로 환영합니다.");
+    }
+
+}