package TcpExamples;

import java.io.IOException;
import java.net.*;

/**
 * An example of using threads to handle multiple connections
 * at the same time. 
 * 
 * @author mcgredo
 */
public class TcpExample4ThreadServer {
    
    public static void main(String[] args) // execution starts here
    {
      try
        {
            ServerSocket serverSocket = new ServerSocket(2317);
			
			int connectionCount = 0; // state variable
            
			System.out.println("TcpExample4ThreadServer ready to accept socket connections...");
            while(true) // infinite loop
            {
                Socket clientConnection = serverSocket.accept(); // block until connected

				connectionCount++; // unblocked, got another connection
				System.out.println("=============================================================");
            	System.out.println("TcpExample4ThreadServer.handlerThread invocation for connection #" + connectionCount + "...");
                TcpExample4HandlerThread handlerThread = new TcpExample4HandlerThread(clientConnection);
                handlerThread.start(); // invokes the run() method in that object
				System.out.println("TcpExample4ThreadServer.handlerThread is launched, awaiting another connection...");
			}          
        }
        catch(IOException e)
        {
            System.out.println("Problem with TcpExample4ThreadServer networking:"); // describe what is happening
            System.out.println("Error: " + e);
            // Provide more helpful information to user if exception occurs due to running twice at one time
            if (e instanceof java.net.BindException)
                System.out.println("*** Be sure to stop any other running instances of programs using this port!");
        }
		System.out.println("=============================================================");
    }
}