From 2da6a97900af30a4843974dbb0c414570389acf3 Mon Sep 17 00:00:00 2001
From: JL-HEIG <jean-luc.blanc2@heig-vd.ch>
Date: Wed, 31 Mar 2021 14:17:01 +0200
Subject: [PATCH 1/3] PROTOCOL written

---
 specs/jlheig/PROTOCOL.md | 55 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 specs/jlheig/PROTOCOL.md

diff --git a/specs/jlheig/PROTOCOL.md b/specs/jlheig/PROTOCOL.md
new file mode 100644
index 0000000..e38e9d4
--- /dev/null
+++ b/specs/jlheig/PROTOCOL.md
@@ -0,0 +1,55 @@
+# RES - Exercise-protocol-Design 2021
+
+Authors : Jean-Luc Blanc
+
+Date : 31.03.2021
+
+------
+
+### What transport protocol do we use?
+
+TCP/IP, most used and popular one. It is also the default one with Java sockets.
+
+### How does the client find the server?
+
+When you start a server, it shows the port its listening to. So the client simply has to connect to that port through the right ip adress.
+
+### Who speaks first?
+
+There are no right or wrongs, but usually clients speak first, this therefor allows the server to decide to accept or not the connection of the client
+
+### What is the sequence of messages exchanged by the client and the server?
+
+1. Server listens to a port
+2. Client try connecting to the server
+3. Server accepts
+4. Server is waiting for a calculation
+5. Client sends one
+6. Server receives it and compute it
+7. Server sends an answer to the client
+8. Client receives it
+9. Client can either ask a new calculation or simply disconnect
+
+### What happens when a message is received from the other party?
+
+Depends on what message was send : 
+* if the message sent is an invalid command, we send an error message
+* if the message is a valid command then we simply send the answer to the calculation
+
+### What is the syntax of the messages? How do we generate and parse them?
+
+That's an arbitrary choice, I would go for that : 
+* add n1 n2
+* sub n1 n2
+* mult n1 n2
+* div n1 n2
+
+Most basic operations can be decomposed in this form : 
+* operation
+* number on the left
+* number on the right
+
+### Who closes the connection and when?
+
+The client decides when to close the connection
+

From 2a9815bc1127cf5f381ff5a725dda76d5479f774 Mon Sep 17 00:00:00 2001
From: JL-HEIG <jean-luc.blanc2@heig-vd.ch>
Date: Wed, 31 Mar 2021 16:46:18 +0200
Subject: [PATCH 2/3] Server and Client implementation, still debugging

---
 specs/jlheig/Code/.idea/workspace.xml         |  46 ++++++++
 specs/jlheig/Code/Client/.idea/.gitignore     |   3 +
 specs/jlheig/Code/Client/.idea/misc.xml       |   6 ++
 specs/jlheig/Code/Client/.idea/modules.xml    |   8 ++
 specs/jlheig/Code/Client/.idea/vcs.xml        |   6 ++
 specs/jlheig/Code/Client/Client.iml           |  11 ++
 .../Client/out/production/Client/Client.class | Bin 0 -> 3148 bytes
 specs/jlheig/Code/Client/src/Client.java      |  89 +++++++++++++++
 specs/jlheig/Code/Server/.idea/.gitignore     |   3 +
 specs/jlheig/Code/Server/.idea/misc.xml       |   6 ++
 specs/jlheig/Code/Server/.idea/modules.xml    |   8 ++
 specs/jlheig/Code/Server/.idea/vcs.xml        |   6 ++
 specs/jlheig/Code/Server/Server.iml           |  11 ++
 .../Server/out/production/Server/Server.class | Bin 0 -> 4209 bytes
 specs/jlheig/Code/Server/src/Server.java      | 102 ++++++++++++++++++
 15 files changed, 305 insertions(+)
 create mode 100644 specs/jlheig/Code/.idea/workspace.xml
 create mode 100644 specs/jlheig/Code/Client/.idea/.gitignore
 create mode 100644 specs/jlheig/Code/Client/.idea/misc.xml
 create mode 100644 specs/jlheig/Code/Client/.idea/modules.xml
 create mode 100644 specs/jlheig/Code/Client/.idea/vcs.xml
 create mode 100644 specs/jlheig/Code/Client/Client.iml
 create mode 100644 specs/jlheig/Code/Client/out/production/Client/Client.class
 create mode 100644 specs/jlheig/Code/Client/src/Client.java
 create mode 100644 specs/jlheig/Code/Server/.idea/.gitignore
 create mode 100644 specs/jlheig/Code/Server/.idea/misc.xml
 create mode 100644 specs/jlheig/Code/Server/.idea/modules.xml
 create mode 100644 specs/jlheig/Code/Server/.idea/vcs.xml
 create mode 100644 specs/jlheig/Code/Server/Server.iml
 create mode 100644 specs/jlheig/Code/Server/out/production/Server/Server.class
 create mode 100644 specs/jlheig/Code/Server/src/Server.java

diff --git a/specs/jlheig/Code/.idea/workspace.xml b/specs/jlheig/Code/.idea/workspace.xml
new file mode 100644
index 0000000..eb09126
--- /dev/null
+++ b/specs/jlheig/Code/.idea/workspace.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="ddadef04-8fa5-416c-be1b-aff137570da4" name="Default Changelist" comment="" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/../../.." />
+  </component>
+  <component name="ProjectId" id="1qWYH2ddeYWPmnwfWjLnxpVAYIr" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">
+    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
+    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/Server" />
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="ddadef04-8fa5-416c-be1b-aff137570da4" name="Default Changelist" comment="" />
+      <created>1617196724818</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1617196724818</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Client/.idea/.gitignore b/specs/jlheig/Code/Client/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/specs/jlheig/Code/Client/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/specs/jlheig/Code/Client/.idea/misc.xml b/specs/jlheig/Code/Client/.idea/misc.xml
new file mode 100644
index 0000000..e0844bc
--- /dev/null
+++ b/specs/jlheig/Code/Client/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Client/.idea/modules.xml b/specs/jlheig/Code/Client/.idea/modules.xml
new file mode 100644
index 0000000..b7ec2d4
--- /dev/null
+++ b/specs/jlheig/Code/Client/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Client.iml" filepath="$PROJECT_DIR$/Client.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Client/.idea/vcs.xml b/specs/jlheig/Code/Client/.idea/vcs.xml
new file mode 100644
index 0000000..4fce1d8
--- /dev/null
+++ b/specs/jlheig/Code/Client/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../../../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Client/Client.iml b/specs/jlheig/Code/Client/Client.iml
new file mode 100644
index 0000000..c90834f
--- /dev/null
+++ b/specs/jlheig/Code/Client/Client.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Client/out/production/Client/Client.class b/specs/jlheig/Code/Client/out/production/Client/Client.class
new file mode 100644
index 0000000000000000000000000000000000000000..e50266040f590dd10c3ed690f9f7c1298e86e2ed
GIT binary patch
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HcmV?d00001

diff --git a/specs/jlheig/Code/Client/src/Client.java b/specs/jlheig/Code/Client/src/Client.java
new file mode 100644
index 0000000..2ee2ec0
--- /dev/null
+++ b/specs/jlheig/Code/Client/src/Client.java
@@ -0,0 +1,89 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.Socket;
+import java.util.Scanner;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class Client {
+    public static void main(String[] args) throws IOException {
+        Client client = new Client();
+        Scanner scan = new Scanner(System.in);
+
+        if(args.length == 0){
+            System.out.println("Error, we need 1 argument to serve as the server adress");
+            return;
+        }
+
+        String server = args[0];
+        client.connect(server, PORT);
+        String input;
+        do{
+            input = scan.nextLine();
+
+            if(input.compareTo(QUIT) == 0){
+                client.isConnected = false;
+            }
+
+            client.writer.println(input);
+
+        }while(!client.isConnected);
+
+        client.disconnect();
+    }
+
+    public static String QUIT = "QUIT";
+    public static int PORT = 3334;
+
+    private Logger logger = Logger.getLogger(Client.class.getName());
+
+    Socket clientSocket;
+    PrintWriter writer;
+    BufferedReader reader;
+    boolean isConnected;
+
+    public void connect(String server, int port) throws IOException{
+        try{
+            clientSocket = new Socket(server, port);
+            writer = new PrintWriter(clientSocket.getOutputStream());
+            reader = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+            isConnected = true;
+        }
+        catch (IOException e){
+            logger.log(Level.SEVERE, "Impossible to connect to the server, server not found", e.getMessage());
+        }
+
+        listener();
+    }
+
+    public void disconnect() throws IOException{
+        try {
+            if (isConnected) {
+                logger.log(Level.INFO, "Client wants to quit");
+                isConnected = false;
+                writer.close();
+                reader.close();
+                clientSocket.close();
+            }
+        }
+        catch (IOException e){
+            logger.log(Level.SEVERE, "Error while disconnecting", e.getMessage());
+        }
+    }
+
+    public void listener(){
+        try{
+            String resp;
+            resp = reader.readLine();
+            while(isConnected && (resp != null)){
+                System.out.println(resp);
+            }
+        }
+        catch (IOException e){
+            logger.log(Level.SEVERE, "Error while listening", e.getMessage());
+        }
+    }
+
+}
diff --git a/specs/jlheig/Code/Server/.idea/.gitignore b/specs/jlheig/Code/Server/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/specs/jlheig/Code/Server/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/specs/jlheig/Code/Server/.idea/misc.xml b/specs/jlheig/Code/Server/.idea/misc.xml
new file mode 100644
index 0000000..e0844bc
--- /dev/null
+++ b/specs/jlheig/Code/Server/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Server/.idea/modules.xml b/specs/jlheig/Code/Server/.idea/modules.xml
new file mode 100644
index 0000000..7ec00e1
--- /dev/null
+++ b/specs/jlheig/Code/Server/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Server.iml" filepath="$PROJECT_DIR$/Server.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Server/.idea/vcs.xml b/specs/jlheig/Code/Server/.idea/vcs.xml
new file mode 100644
index 0000000..4fce1d8
--- /dev/null
+++ b/specs/jlheig/Code/Server/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../../../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Server/Server.iml b/specs/jlheig/Code/Server/Server.iml
new file mode 100644
index 0000000..c90834f
--- /dev/null
+++ b/specs/jlheig/Code/Server/Server.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/specs/jlheig/Code/Server/out/production/Server/Server.class b/specs/jlheig/Code/Server/out/production/Server/Server.class
new file mode 100644
index 0000000000000000000000000000000000000000..a594f369bbbc5749f38ee76b11eee5d1d5d75cae
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/specs/jlheig/Code/Server/src/Server.java b/specs/jlheig/Code/Server/src/Server.java
new file mode 100644
index 0000000..43bff83
--- /dev/null
+++ b/specs/jlheig/Code/Server/src/Server.java
@@ -0,0 +1,102 @@
+import java.io.*;
+import java.net.*;
+
+public class Server {
+    public static void main(String[] args) throws IOException {
+        Server server = new Server();
+        while (true){
+            server.waitForClients();
+        }
+    }
+
+    public static String HELP = "HELP";
+    public static String QUIT = "QUIT";
+    public static int PORT = 3334;
+
+    public static String ADD = "ADD";
+    public static String SUB = "SUB";
+    public static String MULT = "MULT";
+    public static String DIV = "DIV";
+
+    public void waitForClients() throws IOException {
+        ServerSocket server = new ServerSocket(PORT);
+        Socket calculator = server.accept();
+
+        SocketAddress address = calculator.getRemoteSocketAddress();
+
+        if(address instanceof InetSocketAddress){
+            InetAddress addressInet = ((InetSocketAddress)address).getAddress();
+            if(addressInet instanceof Inet4Address){
+                System.out.println("Listening in IPV4 at : " + addressInet + " Port : " + PORT);
+            }
+            else if(addressInet instanceof Inet6Address){
+                System.out.println("Listening in IPV6 at : " + addressInet + " Port : " + PORT);
+            }
+            else{
+                System.err.println("Wrong internet protocol socket");
+            }
+        }
+
+        PrintWriter writer = new PrintWriter(new OutputStreamWriter(calculator.getOutputStream()));
+        BufferedReader reader = new BufferedReader(new InputStreamReader(calculator.getInputStream()));
+
+        writer.println("Hello, please enter the calculation you want to do : ");
+
+        String input = reader.readLine();
+        while(input != null){
+            String[] inputSplitted = input.split(" ");
+
+            if(inputSplitted.length == 1){
+                String command = inputSplitted[0];
+                if(command.equals(HELP)){
+                    writer.println("Supported operations : ADD, SUB, MULT, DIV");
+                    writer.println("All operations require only 2 arguments");
+                    writer.println("If you want to quit use command QUIT");
+                }
+                else if(command.equals(QUIT)){
+                    writer.println("Closing the connection...");
+                    reader.close();
+                    writer.close();
+                    calculator.close();
+                    server.close();
+                    return;
+                }
+                else{
+                    writer.println("Error, unsupported command, please use HELP");
+                }
+            }
+            else if(inputSplitted.length == 3){
+                String operation = inputSplitted[0];
+                int n1 = Integer.parseInt(inputSplitted[1]);
+                int n2 = Integer.parseInt(inputSplitted[2]);
+
+                if(operation.equals(ADD)){
+                    writer.println("Result : " + (n1 + n2));
+                }
+                else if(operation.equals(SUB)){
+                    writer.println("Result : " + (n1 - n2));
+                }
+                else if(operation.equals(MULT)){
+                    writer.println("Result : " + (n1 * n2));
+                }
+                else if(operation.equals(DIV)){
+                    writer.println("Result : " + (n1 / n2));
+                }
+                else{
+                    writer.println("Error, unsupported operation, please use HELP");
+                }
+            }
+            else{
+                writer.println("Error, wrong number of arguments, please use HELP");
+            }
+            writer.flush();
+            input = reader.readLine();
+        }
+
+        reader.close();
+        writer.close();
+        calculator.close();
+        server.close();
+
+    }
+}

From d6eea1b2dc1417d856b8789113f7a982b0fe4b46 Mon Sep 17 00:00:00 2001
From: JL-HEIG <jean-luc.blanc2@heig-vd.ch>
Date: Wed, 31 Mar 2021 19:12:11 +0200
Subject: [PATCH 3/3] Correction, now works perfectly! Even added a DIV and
 HELP command

---
 .../production/Client/Client$listener.class   | Bin 0 -> 1284 bytes
 .../Client/out/production/Client/Client.class | Bin 3148 -> 3143 bytes
 specs/jlheig/Code/Client/src/Client.java      |  37 +++++++++--------
 .../Server/out/production/Server/Server.class | Bin 4209 -> 4503 bytes
 specs/jlheig/Code/Server/src/Server.java      |  39 +++++++++++-------
 5 files changed, 44 insertions(+), 32 deletions(-)
 create mode 100644 specs/jlheig/Code/Client/out/production/Client/Client$listener.class

diff --git a/specs/jlheig/Code/Client/out/production/Client/Client$listener.class b/specs/jlheig/Code/Client/out/production/Client/Client$listener.class
new file mode 100644
index 0000000000000000000000000000000000000000..8fc8368c358b605599187f59ab28bdb7f2f9ca67
GIT binary patch
literal 1284
zcmZux*;dm~6y2fNv>|1l5vhPs1}V-1ibySjmciClhqq8JB^Z*fBt`uczra^vDX!&%
zk3RSneu=toQl<qDy*GECX`g-W?eD)oege3ILL7}4)zE}g93vQ$%eaOKOvZ5)QyS8k
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d9Gq7X>!bS+fjSK1O0bWhm%GN`Mi%G+{sY4jEFAy<

literal 0
HcmV?d00001

diff --git a/specs/jlheig/Code/Client/out/production/Client/Client.class b/specs/jlheig/Code/Client/out/production/Client/Client.class
index e50266040f590dd10c3ed690f9f7c1298e86e2ed..525ff31193bd316cb3bf864b34ba6446d40f4649 100644
GIT binary patch
delta 1650
zcmY+FS#%R+6vuxvlVm2tw6tmI0tH%HAWdn@T6Qh1P|#8l5s3>L$N<HVN|J)OMFrgV
z5tZV;;V#`KNR?O5@%Z4gKKkN=@1Elk^?pg+9_HR}x!;}p|KI;N^IhFHb@^}qxO5p<
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delta 1726
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diff --git a/specs/jlheig/Code/Client/src/Client.java b/specs/jlheig/Code/Client/src/Client.java
index 2ee2ec0..e025d81 100644
--- a/specs/jlheig/Code/Client/src/Client.java
+++ b/specs/jlheig/Code/Client/src/Client.java
@@ -19,30 +19,32 @@ public static void main(String[] args) throws IOException {
 
         String server = args[0];
         client.connect(server, PORT);
+        boolean stayConnected = true;
         String input;
         do{
             input = scan.nextLine();
 
             if(input.compareTo(QUIT) == 0){
-                client.isConnected = false;
+                stayConnected = false;
             }
 
             client.writer.println(input);
+            client.writer.flush();
 
-        }while(!client.isConnected);
+        }while(stayConnected);
 
         client.disconnect();
     }
 
-    public static String QUIT = "QUIT";
-    public static int PORT = 3334;
+    private static String QUIT = "QUIT";
+    private static int PORT = 3334;
 
     private Logger logger = Logger.getLogger(Client.class.getName());
 
     Socket clientSocket;
     PrintWriter writer;
     BufferedReader reader;
-    boolean isConnected;
+    boolean isConnected = false;
 
     public void connect(String server, int port) throws IOException{
         try{
@@ -52,13 +54,13 @@ public void connect(String server, int port) throws IOException{
             isConnected = true;
         }
         catch (IOException e){
-            logger.log(Level.SEVERE, "Impossible to connect to the server, server not found", e.getMessage());
+            logger.log(Level.SEVERE, "Impossible to connect to the server", e.getMessage());
         }
 
-        listener();
+        new Thread(new listener()).start();
     }
 
-    public void disconnect() throws IOException{
+    public void disconnect() throws IOException {
         try {
             if (isConnected) {
                 logger.log(Level.INFO, "Client wants to quit");
@@ -73,17 +75,18 @@ public void disconnect() throws IOException{
         }
     }
 
-    public void listener(){
-        try{
+    class listener implements Runnable {
+        public void run(){
             String resp;
-            resp = reader.readLine();
-            while(isConnected && (resp != null)){
-                System.out.println(resp);
+            try{
+                while((isConnected && (resp = reader.readLine()) != null)){
+                    System.out.println(resp);
+                }
+            }
+            catch (IOException e){
+                logger.log(Level.SEVERE, "Error while listening", e.getMessage());
+                isConnected = false;
             }
-        }
-        catch (IOException e){
-            logger.log(Level.SEVERE, "Error while listening", e.getMessage());
         }
     }
-
 }
diff --git a/specs/jlheig/Code/Server/out/production/Server/Server.class b/specs/jlheig/Code/Server/out/production/Server/Server.class
index a594f369bbbc5749f38ee76b11eee5d1d5d75cae..e95da33b284f28d14ed11d820c416fff87255e17 100644
GIT binary patch
delta 2133
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diff --git a/specs/jlheig/Code/Server/src/Server.java b/specs/jlheig/Code/Server/src/Server.java
index 43bff83..ece6cf3 100644
--- a/specs/jlheig/Code/Server/src/Server.java
+++ b/specs/jlheig/Code/Server/src/Server.java
@@ -9,14 +9,14 @@ public static void main(String[] args) throws IOException {
         }
     }
 
-    public static String HELP = "HELP";
-    public static String QUIT = "QUIT";
-    public static int PORT = 3334;
+    private static String HELP = "HELP";
+    private static String QUIT = "QUIT";
+    private static int PORT = 3334;
 
-    public static String ADD = "ADD";
-    public static String SUB = "SUB";
-    public static String MULT = "MULT";
-    public static String DIV = "DIV";
+    private static String ADD = "ADD";
+    private static String SUB = "SUB";
+    private static String MULT = "MULT";
+    private static String DIV = "DIV";
 
     public void waitForClients() throws IOException {
         ServerSocket server = new ServerSocket(PORT);
@@ -33,14 +33,18 @@ else if(addressInet instanceof Inet6Address){
                 System.out.println("Listening in IPV6 at : " + addressInet + " Port : " + PORT);
             }
             else{
-                System.err.println("Wrong internet protocol socket");
+                System.err.println("Wrong IP address");
             }
         }
+        else{
+            System.err.println("Wrong internet protocol socket");
+        }
 
         PrintWriter writer = new PrintWriter(new OutputStreamWriter(calculator.getOutputStream()));
         BufferedReader reader = new BufferedReader(new InputStreamReader(calculator.getInputStream()));
 
         writer.println("Hello, please enter the calculation you want to do : ");
+        writer.flush();
 
         String input = reader.readLine();
         while(input != null){
@@ -48,12 +52,12 @@ else if(addressInet instanceof Inet6Address){
 
             if(inputSplitted.length == 1){
                 String command = inputSplitted[0];
-                if(command.equals(HELP)){
+                if(command.compareTo(HELP) == 0){
                     writer.println("Supported operations : ADD, SUB, MULT, DIV");
                     writer.println("All operations require only 2 arguments");
                     writer.println("If you want to quit use command QUIT");
                 }
-                else if(command.equals(QUIT)){
+                else if(command.compareTo(QUIT) == 0){
                     writer.println("Closing the connection...");
                     reader.close();
                     writer.close();
@@ -70,17 +74,22 @@ else if(inputSplitted.length == 3){
                 int n1 = Integer.parseInt(inputSplitted[1]);
                 int n2 = Integer.parseInt(inputSplitted[2]);
 
-                if(operation.equals(ADD)){
+                if(operation.compareTo(ADD) == 0){
                     writer.println("Result : " + (n1 + n2));
                 }
-                else if(operation.equals(SUB)){
+                else if(operation.compareTo(SUB) == 0){
                     writer.println("Result : " + (n1 - n2));
                 }
-                else if(operation.equals(MULT)){
+                else if(operation.compareTo(MULT) == 0){
                     writer.println("Result : " + (n1 * n2));
                 }
-                else if(operation.equals(DIV)){
-                    writer.println("Result : " + (n1 / n2));
+                else if(operation.compareTo(DIV) == 0){
+                    try {
+                        writer.println("Result : " + (n1 / n2));
+                    }
+                    catch (ArithmeticException e){
+                        writer.println("Error, " + e.getMessage() + " please enter a valid divide operation");
+                    }
                 }
                 else{
                     writer.println("Error, unsupported operation, please use HELP");