고급편/섹션4: 데코레이터 패턴 - 예제 코드1 (#5)

섹션4: 프록시 패턴과 데코레이터 패턴

스프링 로드맵5 고급편/proxy/src/test/java/hello/proxy/pureproxy/decorator/DecoratorPatternTest.java

@@ -0,0 +1,20 @@
+package hello.proxy.pureproxy.decorator;
+
+import hello.proxy.pureproxy.decorator.code.DecoratorPatternClient;
+import hello.proxy.pureproxy.decorator.code.RealComponent;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+
+@Slf4j
+public class DecoratorPatternTest {
+
+    @Test
+    void noDecoration() {
+        RealComponent realComponent = new RealComponent();
+        DecoratorPatternClient client = new DecoratorPatternClient(realComponent);
+
+        client.execute();
+        client.execute();
+        client.execute();
+    }
+}

스프링 로드맵5 고급편/proxy/src/test/java/hello/proxy/pureproxy/decorator/code/Component.java

@@ -0,0 +1,5 @@
+package hello.proxy.pureproxy.decorator.code;
+
+public interface Component {
+    String operation();
+}

스프링 로드맵5 고급편/proxy/src/test/java/hello/proxy/pureproxy/decorator/code/DecoratorPatternClient.java

@@ -0,0 +1,18 @@
+package hello.proxy.pureproxy.decorator.code;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class DecoratorPatternClient {
+
+    private Component component;
+
+    public DecoratorPatternClient(final Component component) {
+        this.component = component;
+    }
+
+    public void execute() {
+        String operation = component.operation();
+        log.info("result = {}", operation);
+    }
+}

스프링 로드맵5 고급편/proxy/src/test/java/hello/proxy/pureproxy/decorator/code/RealComponent.java

@@ -0,0 +1,12 @@
+package hello.proxy.pureproxy.decorator.code;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class RealComponent implements Component {
+    @Override
+    public String operation() {
+        log.info("RealComponent 실행");
+        return "data";
+    }
+}