Server.java
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package pad.prac2;
import java.io.IOException;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class Server
{
private MyServerSocket ss;
private int roomSize;
private boolean kill;
private Connection[] workerPool;
private int freeWorkers;
private Lock lock;
private Condition availableWorkers;
private ConcurrentHashMap<Connection,String> activeConnections;
public Server(String ip, int port, int rS)
{
try
{
ss = new MyServerSocket();
lock = new ReentrantLock();
activeConnections = new ConcurrentHashMap<Connection,String>();
roomSize = rS;
freeWorkers = roomSize;
kill = false;
availableWorkers = lock.newCondition();
workerPool = new Connection[roomSize];
for(int i = 0; i < roomSize; i++)
{
workerPool[i] = new Connection(this);
workerPool[i].start();
}
ss.bind(ip, port);
}
catch(IOException ioExc)
{
System.out.println("TCP: Error initializating server socket");
}
}
public void sendToChat(Connection origin, String message)
{
lock.lock();
String nickname = activeConnections.get(origin);
Set<Connection> connections = activeConnections.keySet();
Iterator<Connection> it = connections.iterator();
Connection conn;
while(it.hasNext())
{
conn = it.next();
if(conn != origin)
{
conn.sendMessage(nickname + ": " + message);
}
}
lock.unlock();
}
public void startServer()
{
while(!kill)
{
MySocket incoming = ss.accept();
if(incoming != null)
{
System.out.println("Accepted connection from " + incoming.getInetAddress());
startWorker(incoming);
}
}
}
public void startWorker(MySocket s)
{
lock.lock();
while(freeWorkers == 0)
{
try
{
lock.unlock();
availableWorkers.await();
lock.lock();
}
catch(InterruptedException intExc)
{
intExc.printStackTrace();
}
}
workerPool[roomSize - freeWorkers].setSock(s);
workerPool[roomSize - freeWorkers].awake();
workerPool[roomSize - freeWorkers] = null;
freeWorkers--;
lock.unlock();
}
public String getNickname(Connection c)
{
return activeConnections.get(c);
}
public void finishWorker(Connection c)
{
lock.lock();
freeWorkers++;
workerPool[roomSize - freeWorkers] = c;
availableWorkers.signal();
lock.unlock();
}
public void addToChatroom(Connection c, String nickName)
{
activeConnections.put(c, nickName);
System.out.println(nickName + " has entered the room");
}
public void finishConnections()
{
Set<Connection> conns = activeConnections.keySet();
Iterator<Connection> it = conns.iterator();
while(it.hasNext())
{
it.next().finish();
}
}
public void killServer()
{
kill = true;
ss.close();
finishConnections();
}
}