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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
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* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package org.atmosphere.container;
import java.io.IOException;
import java.util.logging.Level;
import javax.servlet.AsyncContext;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.atmosphere.cpr.AsynchronousProcessor;
import org.atmosphere.cpr.AtmosphereResourceImpl;
import org.atmosphere.cpr.AtmosphereServlet;
import org.atmosphere.cpr.AtmosphereServlet.Action;
import org.atmosphere.cpr.AtmosphereServlet.AtmosphereConfig;
import org.atmosphere.cpr.CometSupport;
/**
* This class gets used when the {@link AtmosphereServlet} detect the container
* detect Servlet 3.0 Asynch API.
*
* @author Jeanfrancois Arcand
*/
public class Servlet30Support extends AsynchronousProcessor implements CometSupport {
public Servlet30Support(AtmosphereConfig config){
super(config);
}
/**
* Return "javax.servlet".
* @return "javax.servlet"
*/
@Override
public String getContainerName() {
return super.getContainerName() + " using javax.servlet/3.0";
}
/**
* {@inheritDoc}
*/
public Action service(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
Action action = suspended(req, res);
if (action.type == Action.TYPE.SUSPEND) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Suspending" + res);
}
suspend(action,req,res);
} else if (action.type == Action.TYPE.RESUME) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Resuming" + res);
}
if (supportSession()){
AsyncContext asyncContext = (AsyncContext)
req.getSession().getAttribute("org.atmosphere.container.asyncContext");
if (asyncContext != null){
asyncContext.complete();
}
}
Action nextAction = resumed(req, res);
if (nextAction.type == Action.TYPE.SUSPEND) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Suspending after Resuming" + res);
suspend(action,req,res);
}
}
}
return action;
}
/**
* Suspend the connection by invoking {@link HttpServletRequest#startAsync()}
*
* @param action The {@link AtmosphereServlet.Action}
* @param req the {@link HttpServletRequest}
* @param res the {@link HttpServletResponse}
*/
private void suspend(Action action, HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException{
if (!req.isAsyncStarted()){
try{
res.getWriter().flush();
} catch (IllegalStateException ex){
res.getOutputStream().flush();
}
AsyncContext asyncContext = req.startAsync();
asyncContext.addListener(new CometListener());
asyncContext.setTimeout(action.timeout);
req.setAttribute("org.atmosphere.container.asyncContext"
, asyncContext);
if (supportSession()){
// Store as well in the session in case the resume operation
// happens outside the AtmosphereHandler.onStateChange scope.
req.getSession().setAttribute("org.atmosphere.container.asyncContext"
, asyncContext);
}
}
}
/**
* {@inheritDoc}
*/
@Override
public void action(AtmosphereResourceImpl actionEvent) {
if (actionEvent.action().type == Action.TYPE.RESUME){
AsyncContext asyncContext = (AsyncContext)
actionEvent.getRequest()
.getAttribute("org.atmosphere.container.asyncContext");
// Try to find using the Session
if (asyncContext == null && supportSession()){
asyncContext = (AsyncContext)
actionEvent.getRequest().getSession()
.getAttribute("org.atmosphere.container.asyncContext");
}
if (asyncContext != null){
asyncContext.complete();
}
}
}
/**
* Servlet 3.0 async listener support.
*/
private class CometListener implements AsyncListener{
public void onComplete(AsyncEvent event) throws IOException {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Resumed (completed)" + event.getAsyncContext().getRequest());
}
}
public void onTimeout(AsyncEvent event) throws IOException {
if (logger.isLoggable(Level.FINE)) {
logger.fine("onTimeout" + event.getAsyncContext().getRequest());
}
try{
timedout((HttpServletRequest)event.getAsyncContext().getRequest(),
(HttpServletResponse)event.getAsyncContext().getResponse());
} catch (ServletException ex){
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE,"onTimeout" + event.getAsyncContext().getResponse(), ex);
}
}
}
public void onError(AsyncEvent event){
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE,"onError" + event.getAsyncContext().getResponse());
}
try{
cancelled((HttpServletRequest)event.getAsyncContext().getRequest(),
(HttpServletResponse)event.getAsyncContext().getResponse());
} catch (Throwable ex){
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE,"cancelled" + event.getAsyncContext().getResponse(), ex);
}
}
}
public void onStartAsync(AsyncEvent event){
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE,"onStartAsync" + event.getAsyncContext().getResponse());
}
}
}
}
