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Client.java
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Client.java
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import java.io.*;
import java.net.*;
import java.util.*;
public class Client{
String nickName;
String serverIp;
int serverPort;
int clientPort;
Table localTbl;
DatagramSocket clientSocket;
private Thread thread;
boolean isKeyin;
public Client(String nickName, String serverIp, int serverPort, int clientPort) throws Exception{
this.nickName = nickName;
this.serverIp = serverIp;
this.serverPort = serverPort;
this.clientPort = clientPort;
this.localTbl = new Table();
this.clientSocket = new DatagramSocket(this.clientPort);
this.isKeyin = false;
//System.out.println("[Client] nickName:" + this.nickName);
//System.out.println("[Client] serverIp:" + this.serverIp);
//System.out.println("[Client] serverPort:" + this.serverPort);
//System.out.println("[Client] clientPort:" + this.clientPort);
}
private class ReceiveThread implements Runnable {
private String threadName;
ReceiveThread(String name){
threadName = name;
thread = new Thread (this, threadName);
}
public void run() {
InetAddress ipAddress;
Payload recPayload, sendPayload;
String msg;
Serial serial;
HashMap<String, ClientInfo> tbl;
String ip;
//System.out.println("[Client] Running " + threadName + " on port:"+ serverPort);
serial = new Serial();
recPayload = null;
while(true){
try{
//System.out.println("[Client] wait for packet...");
recPayload = receive();
}
catch(Exception e){
e.printStackTrace();
}
//System.out.println("type:" + recPayload.type);
switch (recPayload.type){
case 0:
//add table entry
//System.out.println("[Client] nickName:" + recPayload.nickName);
//System.out.println("[Client] ip:" + recPayload.ip);
//System.out.println("[Client] port:" + recPayload.port);
//System.out.println("[Client] isOnline:" + recPayload.isOnline);
localTbl.insert(recPayload.nickName, recPayload.ip, recPayload.port, recPayload.isOnline);
//localTbl.dumpTable();
//send ack to server
sendPayload = new Payload();
sendPayload.type = 2;
sendPayload.nickName = nickName;
msg = serial.serialize(sendPayload);
try{
ipAddress = InetAddress.getByName(serverIp);
send(msg, ipAddress, serverPort);
}
catch(Exception e){
e.printStackTrace();
}
break;
case 1:
//wake up waiting thread
if(recPayload.msg.length() > 0){
if(isKeyin == true){
System.out.println(">>> " + recPayload.msg);
System.out.print(">>> ");
}
else{
System.out.println(recPayload.msg);
System.out.print(">>> ");
}
}
try{
Thread.sleep(100);
synchronized(thread){
//System.out.println("[Client] ack receive from server, waken...");
thread.notifyAll();
}
}
catch(Exception e){
e.printStackTrace();
}
break;
case 2:
//wake up waiting thread
if(recPayload.msg.length() > 0){
if(isKeyin == true){
System.out.println(">>> " + recPayload.msg);
System.out.print(">>> ");
}
else{
System.out.println(recPayload.msg);
System.out.print(">>> ");
}
}
try{
Thread.sleep(100);
synchronized(thread){
//System.out.println("[Client] ack receive from client, waken...");
thread.notifyAll();
}
}
catch(Exception e){
e.printStackTrace();
}
break;
case 3:
//reset local table
localTbl = new Table();
//send ack to server
sendPayload = new Payload();
sendPayload.type = 2;
sendPayload.nickName = nickName;
msg = serial.serialize(sendPayload);
try{
ipAddress = InetAddress.getByName(serverIp);
send(msg, ipAddress, serverPort);
}
catch(Exception e){
e.printStackTrace();
}
//System.out.println("[Client] start update table...");
break;
case 4:
//TODO add table unlock
//send ack to server
sendPayload = new Payload();
sendPayload.type = 2;
sendPayload.nickName = nickName;
msg = serial.serialize(sendPayload);
try{
ipAddress = InetAddress.getByName(serverIp);
send(msg, ipAddress, serverPort);
}
catch(Exception e){
e.printStackTrace();
}
if(isKeyin == true){
System.out.println(">>> " + recPayload.msg);
System.out.print(">>> ");
}
else{
System.out.println("[Client table updated.]");
System.out.print(">>> ");
}
break;
case 7:
System.out.println(recPayload.nickName + ": " + recPayload.msg);
System.out.print(">>> " );
//send ack to client
sendPayload = new Payload();
sendPayload.type = 2;
sendPayload.nickName = nickName;
sendPayload.msg = "[Message received by " + nickName + ".]";
msg = serial.serialize(sendPayload);
tbl = localTbl.tbl;
synchronized(thread){
try{
ipAddress = InetAddress.getByName(tbl.get(recPayload.nickName).clientIp);
send(msg, ipAddress, tbl.get(recPayload.nickName).clientPort);
}
catch(Exception e){
e.printStackTrace();
}
}
break;
case 10:
if(recPayload.nickName.compareTo("server") == 0){
System.out.println(recPayload.msg);
}
else{
System.out.println(recPayload.nickName + ": " + recPayload.msg);
}
System.out.print(">>> " );
break;
default:
break;
}
}
}
public void start () {
thread.start ();
}
}
public void send(String msg, InetAddress ipAddress, int port) throws Exception{
DatagramPacket sendPacket;
sendPacket = new DatagramPacket(msg.getBytes(), msg.getBytes().length, ipAddress, port);
clientSocket.send(sendPacket);
}
public Payload receive() throws Exception{
String msg;
byte[] receiveData;
Payload payload;
DatagramPacket receivePacket;
Serial serial;
serial = new Serial();
receiveData = new byte[1024];
receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
msg = new String(receivePacket.getData());
//System.out.println("[Client] msg:" + msg);
payload = serial.deserialize(msg);
return payload;
}
public void register(String nickName) throws Exception{
String msg = "" ;
InetAddress ipAddress;
Payload payload;
Serial serial;
long beforeTime;
serial = new Serial();
msg = "";
ipAddress = InetAddress.getByName(this.serverIp);
while(true){
//send register information to server
beforeTime = System.currentTimeMillis();
payload = new Payload();
payload.type = 0;
payload.nickName = nickName;
payload.ip = InetAddress.getLocalHost().getHostAddress();
payload.port = this.clientPort;
payload.isOnline = 1;
msg = serial.serialize(payload);
send(msg, ipAddress, this.serverPort);
//wait for ack from server
synchronized(thread){
thread.wait();
}
if((System.currentTimeMillis() - beforeTime) < 500){
break;
}
}
}
public void chat(String nickName, String msg) throws Exception{
InetAddress ipAddress;
Payload payload;
Serial serial;
HashMap<String, ClientInfo> tbl;
long beforeTime;
tbl = localTbl.tbl;
if(!tbl.containsKey(nickName)){
System.err.println(">>> nickName:" + nickName + " not existed!!!");
System.out.print(">>> ");
return;
}
serial = new Serial();
beforeTime = System.currentTimeMillis();
//send online message to client
if(tbl.get(nickName).isOnline == 1){
payload = new Payload();
payload.type = 7;
payload.nickName = this.nickName;
payload.msg = msg;
msg = serial.serialize(payload);
ipAddress = InetAddress.getByName(tbl.get(nickName).clientIp);
send(msg, ipAddress, tbl.get(nickName).clientPort);
//wait for ack from client
beforeTime = System.currentTimeMillis();
synchronized(thread){
thread.wait(500);
}
}
//send offline message to server
if((System.currentTimeMillis() - beforeTime) >= 500 || tbl.get(nickName).isOnline == 0 ){
System.out.println(">>> [No ACK from " + nickName + ", message sent to server.]");
payload = new Payload();
payload.type = 9;
payload.nickName = this.nickName;
payload.msg = msg;
payload.offlineAccount = nickName;
msg = serial.serialize(payload);
ipAddress = InetAddress.getByName(this.serverIp);
for(int retry = 1; retry < 6; retry++){
beforeTime = System.currentTimeMillis();
send(msg, ipAddress, this.serverPort);
//wait for ack from server
synchronized(thread){
thread.wait(500);
}
if((System.currentTimeMillis() - beforeTime) >= 500){
System.out.println("[Client] server response tiomeout on " + retry + "-th time");
}
else{
return;
}
}
System.out.println(">>> [Server not responding]");
System.out.println(">>> [Exiting]");
System.out.print(">>> ");
}
}
public void deRegister(String nickName) throws Exception{
InetAddress ipAddress;
Payload payload;
Serial serial;
String msg;
long beforeTime;
//send message to server
serial = new Serial();
payload = new Payload();
payload.type = 8;
payload.nickName = this.nickName;
payload.ip = InetAddress.getLocalHost().getHostAddress();
payload.port = this.clientPort;
msg = serial.serialize(payload);
ipAddress = InetAddress.getByName(this.serverIp);
for(int retry = 1; retry < 6; retry++){
beforeTime = System.currentTimeMillis();
send(msg, ipAddress, this.serverPort);
//wait for ack from server
synchronized(thread){
thread.wait(500);
}
if((System.currentTimeMillis() - beforeTime) >= 500){
System.out.println("[Client] server response tiomeout on " + retry + "-th time");
}
else{
return;
}
}
System.out.println(">>> [Server not responding]");
System.out.println(">>> [Exiting]");
System.out.print(">>> ");
}
private class ProcessorHook extends Thread {
@Override
public void run(){
try{
deRegister(nickName);
}
catch(Exception e){
e.printStackTrace();
}
}
}
public void mainLoop() throws Exception{
ReceiveThread receiveThread;
BufferedReader br;
String command, strLine, msg, nickName;
Runtime.getRuntime().addShutdownHook(new ProcessorHook());
receiveThread = new ReceiveThread("Receive thread");
receiveThread.start();
register(this.nickName);
Thread.sleep(100);
while(true){
br = new BufferedReader(new InputStreamReader(System.in));
isKeyin = false;
strLine = br.readLine();
isKeyin = true;
if(strLine.indexOf(' ') == -1){
System.err.println("Wrong format !!!");
System.out.print(">>> ");
continue;
}
command = strLine.substring(0, strLine.indexOf(' '));
strLine = strLine.substring(strLine.indexOf(' ') + 1);
if(command.compareTo("send") == 0){
if(strLine.indexOf(' ') == -1){
System.err.println("Wrong format !!!");
System.out.print(">>> ");
continue;
}
nickName = strLine.substring(0, strLine.indexOf(' '));
msg = strLine.substring(strLine.indexOf(' ') + 1);
chat(nickName, msg);
}
else if(command.compareTo("dereg") == 0){
nickName = strLine;
if(nickName.compareTo(this.nickName) == 0){
deRegister(nickName);
}
else{
System.err.println("You cannot de-register others");
System.out.print(">>> ");
}
}
else if(command.compareTo("reg") == 0){
nickName = strLine;
if(nickName.compareTo(this.nickName) == 0){
register(nickName);
}
else{
System.err.println("You cannot register others");
System.out.print(">>> ");
}
}
else{
System.err.println("Wrong format !!!");
System.out.print(">>> ");
}
}
}
}