Examples of javax.servlet.AsyncContext.addListener()

javax.servlet.AsyncContext.addListener()
Registers the given {@link AsyncListener} with the most recentasynchronous cycle that was started by a call to one of the {@link ServletRequest#startAsync} methods.
The given AsyncListener will receive an {@link AsyncEvent} whenthe asynchronous cycle completes successfully, times out, or results in an error.
AsyncListener instances will be notified in the order in which they were added. @param listener the AsyncListener to be registered @throws IllegalStateException if this method is called afterthe container-initiated dispatch, during which one of the {@link ServletRequest#startAsync} methods was called, hasreturned to the container

            throws ServletException, IOException {
        if (req.isAsyncStarted()) {
            req.getAsyncContext().complete();
        } else if (req.isAsyncSupported()) {
            AsyncContext actx = req.startAsync();
            actx.addListener(this);
            resp.setContentType("text/plain");
            clients.add(actx);
            if (clientcount.incrementAndGet()==1) {
                ticker.addTickListener(this);
            }

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                resp.getWriter().print("TimeoutServletGet-");
                final AsyncContext ac = req.startAsync();
                ac.setTimeout(ASYNC_TIMEOUT);


                if (completeOnTimeout != null) {
                    ac.addListener(new TrackingListener(false,
                            completeOnTimeout.booleanValue(), dispatchUrl));
                }
            } else {
                resp.getWriter().print("FAIL: Async unsupported");
            }

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            final int iter = Integer.parseInt(req.getParameter(ITER_PARAM)) - 1;
            final AsyncContext ctxt = req.startAsync();
            if (addTrackingListener) {
                TrackingListener listener =
                    new TrackingListener(completeOnError, true, null);
                ctxt.addListener(listener);
            }
            Runnable run = new Runnable() {
                @Override
                public void run() {
                    if (iter > 0) {

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            final boolean first = TrackingServlet.first;
            TrackingServlet.first = false;


            final AsyncContext ctxt = req.startAsync();
            TrackingListener listener = new TrackingListener(false, true, null);
            ctxt.addListener(listener);
            ctxt.setTimeout(3000);


            Runnable run = new Runnable() {
                @Override
                public void run() {

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                throws ServletException, IOException {


            final AsyncContext asyncContext =
                request.startAsync(request, response);


            asyncContext.addListener(new TrackingListener(false, false, null));


            asyncContext.start(new Runnable() {


                @Override
                public void run() {

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            if (req.isAsyncSupported()) {
                resp.getWriter().print("TimeoutServletGet-");
                final AsyncContext ac = req.startAsync();
                ac.setTimeout(ASYNC_TIMEOUT);


                ac.addListener(new TrackingListener(
                        false, completeOnTimeout, dispatchUrl));
            } else {
                resp.getWriter().print("FAIL: Async unsupported");
            }
        }

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            final int iter = Integer.parseInt(req.getParameter(ITER_PARAM)) - 1;
            final AsyncContext ctxt = req.startAsync();
            if (addTrackingListener) {
                TrackingListener listener =
                    new TrackingListener(completeOnError, true, null);
                ctxt.addListener(listener);
            }
            Runnable run = new Runnable() {
                @Override
                public void run() {
                    if (iter > 0) {

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            final boolean first = TrackingServlet.first;
            TrackingServlet.first = false;


            final AsyncContext ctxt = req.startAsync();
            TrackingListener listener = new TrackingListener(false, true, null);
            ctxt.addListener(listener);
            ctxt.setTimeout(3000);


            Runnable run = new Runnable() {
                @Override
                public void run() {

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                throws ServletException, IOException {


            final AsyncContext asyncContext =
                request.startAsync(request, response);


            asyncContext.addListener(new TrackingListener(false, false, null));


            asyncContext.start(new Runnable() {


                @Override
                public void run() {

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            if (req.isAsyncSupported()) {
                resp.getWriter().print("TimeoutServletGet-");
                final AsyncContext ac = req.startAsync();
                ac.setTimeout(ASYNC_TIMEOUT);
                
                ac.addListener(new TrackingListener(
                        false, completeOnTimeout, dispatchUrl));
            } else
                resp.getWriter().print("FAIL: Async unsupported");
        }
    }

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