From 69c62d780d32d32e5c5a8e0e04756cd4c2e84e64 Mon Sep 17 00:00:00 2001
From: haerong22 <haerong22@naver.com>
Date: Sun, 12 Dec 2021 19:04:48 +0900
Subject: [PATCH] design patterns : chain of responsibillity

---
 .../after/AuthRequestHandler.java             | 14 ++++++++++++
 .../chain_of_responsibility/after/Client.java | 22 +++++++++++++++++++
 .../after/LoggingRequestHandler.java          | 14 ++++++++++++
 .../after/PrintRequestHandler.java            | 14 ++++++++++++
 .../after/Request.java                        | 18 +++++++++++++++
 .../after/RequestHandler.java                 | 16 ++++++++++++++
 .../before/AuthRequestHandler.java            | 11 ++++++++++
 .../before/Client.java                        | 10 +++++++++
 .../before/LoggingRequestHandler.java         | 10 +++++++++
 .../before/Request.java                       | 18 +++++++++++++++
 .../before/RequestHandler.java                |  8 +++++++
 11 files changed, 155 insertions(+)
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/after/AuthRequestHandler.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/after/Client.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/after/LoggingRequestHandler.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/after/PrintRequestHandler.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/after/Request.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/after/RequestHandler.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/before/AuthRequestHandler.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/before/Client.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/before/LoggingRequestHandler.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/before/Request.java
 create mode 100644 design-pattern/gof/src/chain_of_responsibility/before/RequestHandler.java

diff --git a/design-pattern/gof/src/chain_of_responsibility/after/AuthRequestHandler.java b/design-pattern/gof/src/chain_of_responsibility/after/AuthRequestHandler.java
new file mode 100644
index 00000000..39bb0eb7
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/after/AuthRequestHandler.java
@@ -0,0 +1,14 @@
+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);
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/after/Client.java b/design-pattern/gof/src/chain_of_responsibility/after/Client.java
new file mode 100644
index 00000000..bcc93ab6
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/after/Client.java
@@ -0,0 +1,22 @@
+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();
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/after/LoggingRequestHandler.java b/design-pattern/gof/src/chain_of_responsibility/after/LoggingRequestHandler.java
new file mode 100644
index 00000000..097cbaa2
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/after/LoggingRequestHandler.java
@@ -0,0 +1,14 @@
+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);
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/after/PrintRequestHandler.java b/design-pattern/gof/src/chain_of_responsibility/after/PrintRequestHandler.java
new file mode 100644
index 00000000..bad96f98
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/after/PrintRequestHandler.java
@@ -0,0 +1,14 @@
+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);
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/after/Request.java b/design-pattern/gof/src/chain_of_responsibility/after/Request.java
new file mode 100644
index 00000000..df832f63
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/after/Request.java
@@ -0,0 +1,18 @@
+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;
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/after/RequestHandler.java b/design-pattern/gof/src/chain_of_responsibility/after/RequestHandler.java
new file mode 100644
index 00000000..8f1590b1
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/after/RequestHandler.java
@@ -0,0 +1,16 @@
+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);
+        }
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/before/AuthRequestHandler.java b/design-pattern/gof/src/chain_of_responsibility/before/AuthRequestHandler.java
new file mode 100644
index 00000000..8dd7067f
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/before/AuthRequestHandler.java
@@ -0,0 +1,11 @@
+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);
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/before/Client.java b/design-pattern/gof/src/chain_of_responsibility/before/Client.java
new file mode 100644
index 00000000..083317bc
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/before/Client.java
@@ -0,0 +1,10 @@
+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);
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/before/LoggingRequestHandler.java b/design-pattern/gof/src/chain_of_responsibility/before/LoggingRequestHandler.java
new file mode 100644
index 00000000..494996cb
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/before/LoggingRequestHandler.java
@@ -0,0 +1,10 @@
+package chain_of_responsibility.before;
+
+public class LoggingRequestHandler extends RequestHandler {
+
+    @Override
+    public void handler(Request request) {
+        System.out.println("로깅");
+        super.handler(request);
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/before/Request.java b/design-pattern/gof/src/chain_of_responsibility/before/Request.java
new file mode 100644
index 00000000..cbe92ea8
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/before/Request.java
@@ -0,0 +1,18 @@
+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;
+    }
+}
diff --git a/design-pattern/gof/src/chain_of_responsibility/before/RequestHandler.java b/design-pattern/gof/src/chain_of_responsibility/before/RequestHandler.java
new file mode 100644
index 00000000..a8375f6f
--- /dev/null
+++ b/design-pattern/gof/src/chain_of_responsibility/before/RequestHandler.java
@@ -0,0 +1,8 @@
+package chain_of_responsibility.before;
+
+public class RequestHandler {
+
+    public void handler(Request request) {
+        System.out.println(request.getBody());
+    }
+}