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package org.atmosphere.container;
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.websocket.WebSocketSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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 java.io.IOException;
/**
* 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 {
private static final Logger logger = LoggerFactory.getLogger(Servlet30Support.class);
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 request, HttpServletResponse response)
throws IOException, ServletException {
Action action = suspended(request, response);
if (request.getAttribute(WebSocketSupport.WEBSOCKET_SUSPEND) == null) {
if (action.type == Action.TYPE.SUSPEND) {
logger.debug("Suspending response: {}", response);
suspend(action, request, response);
}
else if (action.type == Action.TYPE.RESUME) {
logger.debug("Resuming response: {}", response);
if (supportSession()) {
AsyncContext asyncContext =
(AsyncContext) request.getSession().getAttribute("org.atmosphere.container.asyncContext");
if (asyncContext != null) {
asyncContext.complete();
}
}
Action nextAction = resumed(request, response);
if (nextAction.type == Action.TYPE.SUSPEND) {
logger.debug("Suspending after resuming response: {}", response);
suspend(action, request, response);
}
}
}
else {
if (action.type == Action.TYPE.SUSPEND) {
logger.debug("Suspending response: {}", response);
}
else if (action.type == Action.TYPE.RESUME) {
logger.debug("Resume response: {}", response);
request.setAttribute(WebSocketSupport.WEBSOCKET_RESUME, "true");
}
}
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}
* @throws java.io.IOException
* @throws javax.servlet.ServletException
*/
private void suspend(Action action, HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
if (!req.isAsyncStarted()) {
AsyncContext asyncContext = req.startAsync();
asyncContext.addListener(new CometListener());
// Do nothing except setting the times out
if (action.timeout != -1) {
asyncContext.setTimeout(action.timeout);
} else {
// Jetty 8 does something really weird if you set it to
// Long.MAX_VALUE, which is to resume automatically.
asyncContext.setTimeout(Integer.MAX_VALUE);
}
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 && actionEvent.isInScope()) {
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 && (config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE) == null
|| config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE).equalsIgnoreCase("false"))) {
asyncContext.complete();
}
}
else {
if (!actionEvent.isInScope()) {
logger.debug("Already resumed or cancelled: event: {}", actionEvent);
}
}
}
/**
* Servlet 3.0 async listener support.
*/
private class CometListener implements AsyncListener {
public void onComplete(AsyncEvent event) throws IOException {
logger.debug("Resumed (completed): event: {}", event.getAsyncContext().getRequest());
}
public void onTimeout(AsyncEvent event) throws IOException {
logger.debug("onTimeout(): event: {}", event.getAsyncContext().getRequest());
try {
timedout((HttpServletRequest) event.getAsyncContext().getRequest(),
(HttpServletResponse) event.getAsyncContext().getResponse());
} catch (ServletException ex) {
logger.debug("onTimeout(): failed timing out comet response: " + event.getAsyncContext().getResponse(), ex);
}
}
public void onError(AsyncEvent event) {
logger.debug("onError(): event: {}", event.getAsyncContext().getResponse());
try {
cancelled((HttpServletRequest) event.getAsyncContext().getRequest(),
(HttpServletResponse) event.getAsyncContext().getResponse());
} catch (Throwable ex) {
logger.debug("failed cancelling comet response: " + event.getAsyncContext().getResponse(), ex);
}
}
public void onStartAsync(AsyncEvent event) {
logger.debug("onStartAsync(): event: {}", event.getAsyncContext().getResponse());
}
}
}