org.wings.comet.JettyCometWingServlet Maven / Gradle / Ivy

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package org.wings.comet;

import org.mortbay.util.ajax.Continuation;
import org.mortbay.util.ajax.ContinuationSupport;
import org.wings.session.*;

import javax.servlet.*;
import javax.servlet.http.*;

public class JettyCometWingServlet extends CometWingServlet {

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException {

        Session session = getSession(request);
        if (session == null) {
            super.doGet(request, response);
            return;
        }

        final Comet comet = session.getComet();
        final JettyPushable pushable = (JettyPushable)comet.getPushable();
        final CometConnectionManager connectionManager = comet.getConnectionManager();

        final String pathInfo = request.getPathInfo();

        if (pathInfo != null && pathInfo.startsWith(HANGING_PATH)) {
            final Continuation continuation = ContinuationSupport.getContinuation(request, null);
            boolean resumed;
            synchronized (pushable) {
                if (!continuation.isPending()) {
                    if (connectionManager.addHangingGet()) {
                        pushable.setPushInfo(response, continuation);
                        if (!pushable.isPushInfoValid()) return;
                    } else {
                        pushable.setPeriodicPolling(response);
                        return;
                    }
                }
                resumed = continuation.suspend(comet.getLongPollingTimeout());
            }

            if (!resumed) {
                pushable.reconnect();
            }
            pushable.write(response, continuation.getObject());
            pushable.reset();
        } else {
            final String param = request.getParameter(PERIODIC_POLLING_PARAM);
            if (param != null) {
                if (connectionManager.canAddHangingGet()) {
                    synchronized (pushable) {
                        if (!pushable.isSwitchActive()) {
                            pushable.setSwitchActive(true);
                            pushable.switchToHanging();
                        }
                    }
                }
            }
            super.doGet(request, response);
        }    
    }
}