design patterns : chain of responsibillity

design-pattern/gof/src/chain_of_responsibility/after/AuthRequestHandler.java

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+package chain_of_responsibility.after;
+
+public class AuthRequestHandler extends RequestHandler {
+
+    public AuthRequestHandler(RequestHandler nextHandler) {
+        super(nextHandler);
+    }
+
+    @Override
+    public void handle(Request request) {
+        System.out.println("인증이 되었나?");
+        super.handle(request);
+    }
+}

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

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+package chain_of_responsibility.after;
+
+public class Client {
+
+    private RequestHandler requestHandler;
+
+    public Client(RequestHandler requestHandler) {
+        this.requestHandler = requestHandler;
+    }
+
+    public void doWork() {
+        Request request = new Request("이번 놀이는 뽑기입니다.");
+        requestHandler.handle(request);
+    }
+
+    public static void main(String[] args) {
+        RequestHandler chain = new AuthRequestHandler(new LoggingRequestHandler(new PrintRequestHandler(null)));
+
+        Client client = new Client(chain);
+        client.doWork();
+    }
+}

design-pattern/gof/src/chain_of_responsibility/after/LoggingRequestHandler.java

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+package chain_of_responsibility.after;
+
+public class LoggingRequestHandler extends RequestHandler {
+
+    public LoggingRequestHandler(RequestHandler nextHandler) {
+        super(nextHandler);
+    }
+
+    @Override
+    public void handle(Request request) {
+        System.out.println("로깅");
+        super.handle(request);
+    }
+}

design-pattern/gof/src/chain_of_responsibility/after/PrintRequestHandler.java

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+package chain_of_responsibility.after;
+
+public class PrintRequestHandler extends RequestHandler {
+
+    public PrintRequestHandler(RequestHandler nextHandler) {
+        super(nextHandler);
+    }
+
+    @Override
+    public void handle(Request request) {
+        System.out.println(request.getBody());
+        super.handle(request);
+    }
+}

design-pattern/gof/src/chain_of_responsibility/after/Request.java

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+package chain_of_responsibility.after;
+
+public class Request {
+
+    private String body;
+
+    public Request(String body) {
+        this.body = body;
+    }
+
+    public String getBody() {
+        return body;
+    }
+
+    public void setBody(String body) {
+        this.body = body;
+    }
+}

design-pattern/gof/src/chain_of_responsibility/after/RequestHandler.java

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+package chain_of_responsibility.after;
+
+public abstract class RequestHandler {
+
+    private RequestHandler nextHandler;
+
+    public RequestHandler(RequestHandler nextHandler) {
+        this.nextHandler = nextHandler;
+    }
+
+    public void handle(Request request) {
+        if (nextHandler != null) {
+            nextHandler.handle(request);
+        }
+    }
+}

design-pattern/gof/src/chain_of_responsibility/before/AuthRequestHandler.java

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+package chain_of_responsibility.before;
+
+public class AuthRequestHandler extends RequestHandler {
+
+    @Override
+    public void handler(Request request) {
+        System.out.println("인증이 되었나?");
+        System.out.println("이 핸들러를 사용할 수 있는 유저인가?");
+        super.handler(request);
+    }
+}

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

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+package chain_of_responsibility.before;
+
+public class Client {
+
+    public static void main(String[] args) {
+        Request request = new Request("무궁화 꽃이 피었습니다.");
+        RequestHandler requestHandler = new AuthRequestHandler();
+        requestHandler.handler(request);
+    }
+}

design-pattern/gof/src/chain_of_responsibility/before/LoggingRequestHandler.java

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+package chain_of_responsibility.before;
+
+public class LoggingRequestHandler extends RequestHandler {
+
+    @Override
+    public void handler(Request request) {
+        System.out.println("로깅");
+        super.handler(request);
+    }
+}

design-pattern/gof/src/chain_of_responsibility/before/Request.java

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+package chain_of_responsibility.before;
+
+public class Request {
+
+    private String body;
+
+    public Request(String body) {
+        this.body = body;
+    }
+
+    public String getBody() {
+        return body;
+    }
+
+    public void setBody(String body) {
+        this.body = body;
+    }
+}

design-pattern/gof/src/chain_of_responsibility/before/RequestHandler.java

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+package chain_of_responsibility.before;
+
+public class RequestHandler {
+
+    public void handler(Request request) {
+        System.out.println(request.getBody());
+    }
+}