import java.io.IOException;

import javax.servlet.*;
import javax.servlet.http.*;

public class ChatHandlerServlet extends HttpServlet {
	private static final long serialVersionUID = -7002979687951651229L;

	private StringBuffer globalMessage;

	public void init(ServletConfig config)
			throws ServletException {
		globalMessage = new StringBuffer(10000);
	}


	/*
	 * doGet -- outputs the current version of the servlet. 
	 */
	public void doGet( HttpServletRequest req, HttpServletResponse resp)
			throws IOException, ServletException {
		resp.getWriter().write(globalMessag.toString());
	}


	public void doPost( HttpServletRequest req, HttpServletResponse resp)
			throws IOException, ServletException {
		String msg =req.getParameter("message");

		if ( (msg != null) && (!msg.equals("")) ) {
			globalMessage.insert(0, new java.util.Date() + ": " + msg + "<br>");

			if (globalMessage.length() > 9000)
				globalMessage = globalMessage.delete(9000, globalMessage.length());
		}
	}
}