🏗️ 装饰器在netty里面的应用逻辑编写

netty-design-patterns-decorator/pom.xml

@@ -9,7 +9,28 @@
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
+    <name>netty :: design patterns :: decorator</name>
     <artifactId>netty-design-patterns-decorator</artifactId>
+    <description>装饰器在Netty里面的应用</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+        </dependency>
+    </dependencies>
 
 
 </project>

netty-design-patterns-decorator/src/main/java/App.java

@@ -0,0 +1,29 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author james mu
+ * @date 2020/4/16 19:55
+ */
+public class App {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
+
+    public static void main(String[] args) {
+
+        // simple troll
+        LOGGER.info("A simple looking troll approaches.");
+        Troll troll = new SimpleTroll();
+        troll.attack();
+        troll.fleeBattle();
+        LOGGER.info("Simple troll power {}.\n", troll.getAttackPower());
+
+        // change the behavior of the simple troll by adding a decorator
+        LOGGER.info("A troll with huge club surprises you.");
+        ClubbedTroll clubbedTroll = new ClubbedTroll(troll);
+        clubbedTroll.attack();
+        clubbedTroll.fleeBattle();
+        LOGGER.info("Clubbed troll power {}.\n", clubbedTroll.getAttackPower());
+    }
+
+}

netty-design-patterns-decorator/src/main/java/ClubbedTroll.java

@@ -0,0 +1,33 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author james mu
+ * @date 2020/4/16 19:53
+ */
+public class ClubbedTroll implements Troll {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ClubbedTroll.class);
+
+    private Troll decorated;
+
+    public ClubbedTroll(Troll decorated) {
+        this.decorated = decorated;
+    }
+
+    @Override
+    public void attack() {
+        decorated.attack();
+        LOGGER.info("The troll swings at you with a club!");
+    }
+
+    @Override
+    public int getAttackPower() {
+        return decorated.getAttackPower() + 10;
+    }
+
+    @Override
+    public void fleeBattle() {
+        decorated.fleeBattle();
+    }
+}

netty-design-patterns-decorator/src/main/java/SimpleTroll.java

@@ -0,0 +1,26 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author james mu
+ * @date 2020/4/16 19:49
+ */
+public class SimpleTroll implements Troll {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(SimpleTroll.class);
+
+    @Override
+    public void attack() {
+        LOGGER.info("The troll tries to grab you!");
+    }
+
+    @Override
+    public int getAttackPower() {
+        return 10;
+    }
+
+    @Override
+    public void fleeBattle() {
+        LOGGER.info("The troll shrieks in horror and runs away!");
+    }
+}

netty-design-patterns-decorator/src/main/java/Troll.java

@@ -0,0 +1,13 @@
+/**
+ * @author james mu
+ * @date 2020/4/16 19:44
+ */
+public interface Troll {
+
+    void attack();
+
+    int getAttackPower();
+
+    void fleeBattle();
+
+}