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Server.java
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Server.java
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import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
public class Server{
int port;
Table globalTbl;
DatagramSocket serverSocket;
HashMap<String, List<MessageNode>> offlineMsgTbl;
private class MessageNode{
String sender;
String msg;
MessageNode(String s, String m){sender = s; msg = m;}
}
public Server(int port) throws Exception{
this.port = port;
this.globalTbl = new Table();
serverSocket = new DatagramSocket(this.port);
offlineMsgTbl = new HashMap<String, List<MessageNode>>();
System.out.println("[Server] Hello Server, port:" + port);
}
public void send(String msg, InetAddress ipAddress, int port) throws Exception{
DatagramPacket sendPacket;
sendPacket = new DatagramPacket(msg.getBytes(), msg.getBytes().length, ipAddress, port);
serverSocket.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);
serverSocket.receive(receivePacket);
msg = new String(receivePacket.getData());
//System.out.println("[Server] msg:" + msg);
payload = serial.deserialize(msg);
return payload;
}
public void broadcastTable() throws Exception {
HashMap<String, ClientInfo> tbl;
String msg;
Payload recPayload, sendPayload;
Serial serial;
InetAddress ipAddress;
ClientInfo clientInfo;
serial = new Serial();
tbl = globalTbl.tbl;
retry:
for(Map.Entry<String, ClientInfo> client: tbl.entrySet()) {
clientInfo = client.getValue();
ipAddress = InetAddress.getByName(clientInfo.clientIp);
if(clientInfo.isOnline == 0){
continue;
}
//start update table
sendPayload = new Payload();
sendPayload.type = 3;
sendPayload.msg = "[Start update table.]";
msg = serial.serialize(sendPayload);
ipAddress = InetAddress.getByName(clientInfo.clientIp);
//System.out.println("[Server] start updating table");
send(msg, ipAddress, clientInfo.clientPort);
//wait for ack from client
recPayload = receive();
//System.out.println("[Server] receive ack of start");
if(recPayload.type != 2){
continue retry;
}
for(Map.Entry<String, ClientInfo> entry: tbl.entrySet()) {
//send table entry to client
sendPayload = new Payload();
sendPayload.type = 0;
sendPayload.nickName = entry.getKey();
sendPayload.ip = entry.getValue().clientIp;
sendPayload.port = entry.getValue().clientPort;
sendPayload.isOnline = entry.getValue().isOnline;
msg = serial.serialize(sendPayload);
send(msg, ipAddress, clientInfo.clientPort);
//wait for ack from client
recPayload = receive();
//System.out.println("[Server] receive ack of add");
if(recPayload.type != 2){
continue retry;
}
}
//finish table update
sendPayload = new Payload();
sendPayload.type = 4;
msg = serial.serialize(sendPayload);
send(msg, ipAddress, clientInfo.clientPort);
//wait for ack from client
recPayload = receive();
//System.out.println("[Server] receive ack of finish");
if(recPayload.type != 2){
continue retry;
}
}
}
public void dumpOfflineMsg(){
List<MessageNode> messageList;
//System.out.println("[Server] Dump offline message:");
for(Map.Entry<String, List<MessageNode>> entry : offlineMsgTbl.entrySet()){
//System.out.println("[Server] receiver:" + entry.getKey());
messageList = entry.getValue();
for(MessageNode mg: messageList){
//System.out.print("[Server] message:" + mg.msg + ", ");
//System.out.println("sender:" + mg.sender);
}
}
}
public void sendOfflineMsg(String nickName) throws Exception {
HashMap<String, ClientInfo> tbl;
List<MessageNode> messageList;
InetAddress ipAddress;
Payload sendPayload;
String msg;
Serial serial;
int port;
Iterator<MessageNode> it;
tbl = globalTbl.tbl;
serial = new Serial();
ipAddress = InetAddress.getByName(tbl.get(nickName).clientIp);
port = tbl.get(nickName).clientPort;
if(offlineMsgTbl.containsKey(nickName)){
messageList = offlineMsgTbl.get(nickName);
if(messageList.size() > 0){
sendPayload = new Payload();
sendPayload.type = 10;
sendPayload.nickName = "server";
sendPayload.msg = "[You have messages]";
msg = serial.serialize(sendPayload);
send(msg, ipAddress, port);
it = messageList.iterator();
while (it.hasNext()) {
MessageNode msgNode = it.next();
//System.out.print("[Server] message:" + msgNode.msg + ", ");
//System.out.println("sender:" + msgNode.sender);
sendPayload = new Payload();
sendPayload.type = 10;
sendPayload.nickName = msgNode.sender;
sendPayload.msg = msgNode.msg;
msg = serial.serialize(sendPayload);
send(msg, ipAddress, port);
it.remove();
}
}
}
}
public void mainLoop() throws Exception {
HashMap<String, ClientInfo> tbl;
InetAddress ipAddress;
Payload recPayload, sendPayload;
String msg;
Serial serial;
List<MessageNode> msgList;
MessageNode messageNode;
int port;
DateFormat dateFormat;
Date date;
tbl = globalTbl.tbl;
serial = new Serial();
while(true){
recPayload = receive();
//System.out.println("[Server] type:" + recPayload.type);
switch (recPayload.type){
//register
case 0:
//System.out.println("[Server] nickName:" + recPayload.nickName);
//System.out.println("[Server] ip:" + recPayload.ip);
//System.out.println("[Server] port:" + recPayload.port);
//System.out.println("[Server] isOnline:" + recPayload.isOnline);
globalTbl.insert(recPayload.nickName, recPayload.ip, recPayload.port, recPayload.isOnline);
globalTbl.dumpTable();
//send ack to client
sendPayload = new Payload();
sendPayload.type = 1;
sendPayload.msg = "[Welcome, You are registered.]";
msg = serial.serialize(sendPayload);
ipAddress = InetAddress.getByName(recPayload.ip);
//System.out.println("ipAddress:" + ipAddress + ", recPayload.port: " + recPayload.port);
send(msg, ipAddress, recPayload.port);
//broadcast updated table
broadcastTable();
//send offline message
sendOfflineMsg(recPayload.nickName);
break;
//de-register
case 8:
//System.out.println("[Server] nickName:" + recPayload.nickName);
//System.out.println("[Server] ip:" + recPayload.ip);
//System.out.println("[Server] port:" + recPayload.port);
globalTbl.offLine(recPayload.nickName);
globalTbl.dumpTable();
//send ack to client
sendPayload = new Payload();
sendPayload.type = 1;
sendPayload.msg = "[You are Offline. Bye.]";
msg = serial.serialize(sendPayload);
ipAddress = InetAddress.getByName(recPayload.ip);
//System.out.println("ipAddress:" + ipAddress + ", recPayload.port: " + recPayload.port);
send(msg, ipAddress, recPayload.port);
//broadcast updated table
broadcastTable();
break;
//receive offline message
case 9:
//System.out.println("[Server] nickName:" + recPayload.nickName);
//System.out.println("[Server] msg:" + recPayload.msg);
//System.out.println("[Server] offlineAccount:" + recPayload.offlineAccount);
dateFormat = new SimpleDateFormat("yyyy.MM.dd-HH:mm:ss");
date = new Date();
msg = dateFormat.format(date);
msg += " ";
if(tbl.get(recPayload.offlineAccount).isOnline == 0){
if(!offlineMsgTbl.containsKey(recPayload.offlineAccount)){
msgList = new ArrayList<MessageNode>();
msg += recPayload.msg;
messageNode = new MessageNode(recPayload.nickName, msg);
msgList.add(messageNode);
offlineMsgTbl.put(recPayload.offlineAccount, msgList);
}
else{
msg += recPayload.msg;
messageNode = new MessageNode(recPayload.nickName, msg);
offlineMsgTbl.get(recPayload.offlineAccount).add(messageNode);
}
//send ack to client
sendPayload = new Payload();
sendPayload.type = 1;
sendPayload.msg = "[Messages received by the server and saved]";
msg = serial.serialize(sendPayload);
ipAddress = InetAddress.getByName(tbl.get(recPayload.nickName).clientIp);
port = tbl.get(recPayload.nickName).clientPort;
send(msg, ipAddress, port);
}
else{
//send ack to client
sendPayload = new Payload();
sendPayload.type = 1;
sendPayload.msg = "[Client " + recPayload.offlineAccount + " exists!!]";
msg = serial.serialize(sendPayload);
ipAddress = InetAddress.getByName(tbl.get(recPayload.nickName).clientIp);
port = tbl.get(recPayload.nickName).clientPort;
send(msg, ipAddress, port);
//broadcast updated table
broadcastTable();
}
break;
default:
break;
}
}
}
}