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package org.atmosphere.samples.chat;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.atmosphere.cpr.BroadcastFilter;
import org.atmosphere.cpr.Meteor;
import org.atmosphere.util.XSSHtmlFilter;
import org.atmosphere.commons.jersey.JsonpFilter;
import org.atmosphere.commons.util.EventsLogger;
/**
* Simple Servlet that implement the logic to build a Chat application using
* a {@link Meteor} to suspend and broadcast chat message.
*
* @author Jeanfrancois Arcand
* @autor TAKAI Naoto (Orginial author for the Comet based Chat).
*/
public class MeteorChat extends HttpServlet {
private final static long serialVersionUID = -2919167206889576860L;
/**
* List of {@link BroadcastFilter}
*/
private final List<BroadcastFilter> list;
public MeteorChat() {
list = new LinkedList<BroadcastFilter>();
list.add(new XSSHtmlFilter());
list.add(new JsonpFilter());
}
/**
* Create a {@link Meteor} and use it to suspend the response.
* @param req An {@link HttpServletRequest}
* @param res An {@link HttpServletResponse}
*/
@Override
public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
Meteor m = Meteor.build(req, list, null);
// Log all events on the concole.
m.addListener(new EventsLogger());
req.getSession().setAttribute("meteor", m);
res.setContentType("text/html;charset=ISO-8859-1");
m.suspend(-1);
m.broadcast(req.getServerName() + "__has suspended a connection from " + req.getRemoteAddr());
}
/**
* Re-use the {@link Meteor} created onthe first GET for broadcasting message.
*
* @param req An {@link HttpServletRequest}
* @param res An {@link HttpServletResponse}
*/
@Override
public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException {
Meteor m = (Meteor)req.getSession().getAttribute("meteor");
res.setCharacterEncoding("UTF-8");
String action = req.getParameterValues("action")[0];
String name = req.getParameterValues("name")[0];
if ("login".equals(action)) {
req.getSession().setAttribute("name", name);
m.broadcast("System Message from " + req.getServerName() + "__" + name + " has joined.");
res.getWriter().write("success");
res.getWriter().flush();
} else if ("post".equals(action)) {
String message = req.getParameterValues("message")[0];
m.broadcast(name + "__" + message);
res.getWriter().write("success");
res.getWriter().flush();
} else {
res.setStatus(422);
res.getWriter().write("success");
res.getWriter().flush();
}
}
}