package protocol_sockets.example;

import java.io.*;
import protocol_sockets.*;

/**
 * <p>
 * This client makes a connection to {@link ExampleServer}, sends a short
 * string of information, and waits to disconnect.
 * </p>
 * 
 * @author Stephen G. Ware
 */
public class ExampleClient extends Thread implements Receiver {

	/** URL of the server */
	private final String url;
	/** Port on which to connect */
	private final int port;
	/** The socket connected to the server */
	private ProtocolSocket socket;
	
	/**
	 * <p>
	 * Main constructor.
	 * </p>
	 * 
	 * @param url URL of the server
	 * @param port port on which to connect
	 */
	public ExampleClient(String url, int port){
		this.url = url;
		this.port = port;
	}
	
	/**
	 * <p>
	 * Connect to the server and send a string of XML data.
	 * </p>
	 */
	public void run() {
		try{
			System.out.println("CLIENT IS ATTEMPTING TO CONNECT");
			// Create a socket and connect
			socket = new ProtocolSocket(url, port);
			// Register to receive input from the socket
			socket.addReceiver(this);
			// Wait for the server to tell us we're connected
			socket.waitForResponse("<helloClient/>");
			// Send a username and password to the server
			socket.send("<helloServer><name>Bob</name><password>secret</password></helloServer>");
		}
		catch(IOException ex){ ex.printStackTrace(); }
	}
	
	/**
	 * <p>
	 * This method is called by a separate thread every time the socket reads
	 * in a line of data.  If the server sends a "goodbye" message, the client
	 * closes the socket.
	 * </p>
	 */
	public void receive(String message){
		if(message.equals("<goodbyeClient/>")){
			System.out.println("CLIENT HAS BEEN DISCONNECTED");
			try{ socket.close(); }
			catch(IOException ex){}
		}
	}
}