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package org.atmosphere.samples.tictactoe;
import org.atmosphere.cpr.AtmosphereHandler;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.AtmosphereResourceEvent;
import org.atmosphere.cpr.Broadcaster;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
* Simple handler that listens for GET and POST requests, and responds appropriately.
* Uses long polling, with a GET that listens for new data, and a POST that triggers
* broadcasts to all clients, resuming the GETs and returning that data.
*
* Actual game logic is held in a separate class - {@link TTTGame}.
* @author driscoll
*
*/
public class TTTHandler implements AtmosphereHandler<HttpServletRequest, HttpServletResponse> {
private static TTTGame game = new TTTGame();
/**
* On GET, suspend the conneciton. On POST, update game logic, send
* broadcast, and resume the connection.
* @param event
* @throws IOException
*/
public void onRequest(AtmosphereResource<HttpServletRequest, HttpServletResponse> event) throws IOException {
HttpServletRequest req = event.getRequest();
HttpServletResponse res = event.getResponse();
res.setContentType("text/html");
res.addHeader("Cache-Control", "private");
res.addHeader("Pragma", "no-cache");
if (req.getMethod().equalsIgnoreCase("GET")) {
event.suspend();
} else if (req.getMethod().equalsIgnoreCase("POST")) {
// There are better ways to do this, but it's the simplest way to
// ensure that there is data consistency
synchronized (game) {
int cell = -1;
String cellStr = req.getParameter("cell");
PrintWriter writer = res.getWriter();
writer.println("cell is '" + cellStr + "'");
if (cellStr == null) {
writer.println("error - cell not set");
return;
}
try {
cell = Integer.parseInt(cellStr);
} catch (NumberFormatException nfe) {
writer.println("error - cellStr not an int: " + cellStr);
return;
}
if (!game.turn(cell)) {
writer.println("warning - invalid move");
}
writer.println(game.getJSON());
Broadcaster bc = event.getBroadcaster();
String response = game.getJSON();
// broadcast the updated game state
bc.broadcast(response);
writer.flush();
if (game.win() != -1) {
game = new TTTGame();
}
}
}
}
/**
* Resume the underlying response on the first Broadcast
* @param event
* @return event
* @throws IOException
*/
public void onStateChange(
AtmosphereResourceEvent<HttpServletRequest, HttpServletResponse> event) throws IOException {
// Client closed the connection.
if (event.isCancelled()) {
return;
}
if (!event.isResumedOnTimeout()) {
String response = (String) event.getMessage();
response = "<script type='text/javascript'>parent.chImg(" + response + ")</script>\n";
PrintWriter writer = event.getResource().getResponse().getWriter();
writer.write(response);
writer.flush();
event.getResource().resume();
}
}
public void destroy() {
}
}