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package org.atmosphere.container;
import org.atmosphere.cpr.AtmosphereServlet;
import org.atmosphere.cpr.AtmosphereServlet.Action;
import org.atmosphere.cpr.AtmosphereServlet.AtmosphereConfig;
import org.atmosphere.util.gae.GAEDefaultBroadcaster;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* This class gets used when the {@link AtmosphereServlet} detected the
* Google App Engine support. In that case, the {@link GAEDefaultBroadcaster} wil be used.
*
* @author Jeanfrancois Arcand
*/
public class GoogleAppEngineCometSupport extends BlockingIOCometSupport {
private static final Logger logger = LoggerFactory.getLogger(GoogleAppEngineCometSupport.class);
public GoogleAppEngineCometSupport(AtmosphereConfig config) {
super(config);
}
/**
* Suspend the connection by blocking the current {@link Thread} no more than 30 seconds
*
* @param action The {@link AtmosphereServlet.Action}
* @param req the {@link HttpServletRequest}
* @param res the {@link HttpServletResponse}
*/
@Override
protected void suspend(Action action, HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
CountDownLatch latch = new CountDownLatch(1);
req.setAttribute(LATCH, latch.hashCode());
latchs.put(latch.hashCode(), latch);
if (supportSession()) {
// Store as well in the session in case the resume operation
// happens outside the AtmosphereHandler.onStateChange scope.
req.getSession().setAttribute(LATCH, latch.hashCode());
}
try {
// Google App Engine doesn't allow a thread to block more than 30 seconds
if (action.timeout != -1 && action.timeout < 30000) {
latch.await(action.timeout, TimeUnit.MILLISECONDS);
}
else {
latch.await(20000, TimeUnit.MILLISECONDS);
}
}
catch (Throwable ex) {
logger.warn("Unable to resume the suspended connection", ex);
}
finally {
try {
timedout(req, res);
}
catch (Throwable e) {
logger.warn("Unable to timeout connection", e);
}
}
}
}