package de.jochenbrissier.backyard.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.CometEvent;
import org.apache.catalina.CometProcessor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.json.JSONObject;
import de.jochenbrissier.backyard.core.Backyard;
import de.jochenbrissier.backyard.util.ServerDedec;
/**
* This servlet is the communications backend to the jquery plugin <br>
*set this servelt in your web.xml to use the plugin. <br>
*This supports Tomcat 6.0.x
*
*
*
*
* @author jochen brissier
*
*/
public class BackyardTomcatServlet extends HttpServlet implements
CometProcessor {
Log log = LogFactory.getLog(BackyardTomcatServlet.class);
@Override
public void init() throws ServletException {
Backyard.autoDedectImpl(this);
}
private void send(HttpServletRequest req, HttpServletResponse resp,
JSONObject json) {
}
private HttpServletRequest req;
private HttpServletResponse res;
@Override
public void service(final HttpServletRequest req,
final HttpServletResponse res) throws ServletException, IOException {
if (ServerDedec.isServer(ServerDedec.TOMCAT6, this)) {
//super.service(req, res);
return;
}
req.setAttribute("de.jochenbrissier.byw.comet", "noneTomcat");
event(new CometEvent() {
@Override
public void setTimeout(int arg0) throws IOException,
ServletException, UnsupportedOperationException {
// TODO Auto-generated method stub
}
@Override
public HttpServletResponse getHttpServletResponse() {
// TODO Auto-generated method stub
return res;
}
@Override
public HttpServletRequest getHttpServletRequest() {
// TODO Auto-generated method stub
return req;
}
@Override
public EventType getEventType() {
// TODO Auto-generated method stub
return EventType.BEGIN;
}
@Override
public EventSubType getEventSubType() {
// TODO Auto-generated method stub
return null;
}
@Override
public void close() throws IOException {
// TODO Auto-generated method stub
}
});
}
private void listenChannel(HttpServletRequest req,
HttpServletResponse resp, JSONObject json, Backyard backyard) {
String channelName = json.getJSONObject("channel").getString(
"channel_name");
backyard.listenToChannel(channelName);
}
public void event(CometEvent ev) throws IOException, ServletException {
log.debug("enter service backyard servlet");
log.debug("enter BackyardServlet");
HttpServletRequest req = ev.getHttpServletRequest();
HttpServletResponse resp = ev.getHttpServletResponse();
// Backyard API
Backyard backyard = new Backyard(req, resp);
backyard.setServlet(this);
// json obj
String data = req.getParameter("data");
try {
log.debug("Parsing JSON: " + data);
JSONObject json = new JSONObject(data);
// get function from request json
String function = json.getString("fn");
if (function.matches("handshake")) {
log.debug("Handshake");
// TODO: GENERATE AN ID OR SEND THE SESSION ID TO THE CLIENT
PrintWriter pw = ev.getHttpServletResponse().getWriter();
pw.print("{\"status\":\"OK\"}");
pw.flush();
pw.close();
return;
}
if (function.matches("comet")) {
log.debug("comet");
// if the implementation is a non Tomcat implementation invoke
// the normal
if (req.getAttribute("de.jochenbrissier.byw.comet") != null
&& req.getAttribute("de.jochenbrissier.byw.comet")
.equals("nonTomcat")) {
backyard.startAsync();
} else {
backyard.startAsync(ev);
}
}
if (function.matches("listen")) {
log.debug("listen");
listenChannel(req, resp, json, backyard);
ev.close();
}
if (function.matches("send")) {
log.debug("sendtochannel");
JSONObject channeldata = json.getJSONObject("channel");
try {
backyard.getChannel(channeldata.getString("channel_name"))
.sendMessage(json.getString("data"));
} catch (Exception e) {
e.printStackTrace();
}
ev.close();
}
} catch (Exception e) {
log.warn(e);
}
}
}