Examples of javax.servlet.AsyncContext

javax.servlet.AsyncContext
Class representing the execution context for an asynchronous operation that was initiated on a ServletRequest.
An AsyncContext is created and initialized by a call to {@link ServletRequest#startAsync()} or{@link ServletRequest#startAsync(ServletRequest,ServletResponse)}. Repeated invocations of these methods will return the same AsyncContext instance, reinitialized as appropriate.
In the event that an asynchronous operation has timed out, the container must run through these steps:
1. Invoke, at their {@link AsyncListener#onTimeout onTimeout} method, all{@link AsyncListener} instances registered with the ServletRequeston which the asynchronous operation was initiated.
2. If none of the listeners called {@link #complete} or any of the{@link #dispatch} methods, perform an error dispatch with a status codeequal to HttpServletResponse.SC_INTERNAL_SERVER_ERROR.
3. If no matching error page was found, or the error page did not call {@link #complete} or any of the {@link #dispatch} methods, call{@link #complete}.
@since Servlet 3.0

        protected void doGet(final HttpServletRequest req,
                final HttpServletResponse resp)
                throws ServletException, IOException {
            
            String echo = req.getParameter("echo");
            AsyncContext actxt = req.startAsync();
            resp.setContentType("text/plain");
            resp.getWriter().print("OK");
            if (echo != null) {
                resp.getWriter().print("-" + echo);
            }
            // Speed up the test by reducing the timeout
            actxt.setTimeout(1000);
        }

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        @Override
        protected void doGet(final HttpServletRequest req,
                final HttpServletResponse resp)
                throws ServletException, IOException {
            
            AsyncContext actxt = req.startAsync();
            actxt.setTimeout(3000);
            resp.setContentType("text/plain");
            resp.getWriter().print("OK");
            actxt.complete();
        }

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        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
                throws ServletException, IOException {
            if (req.isAsyncSupported()) {
                resp.getWriter().print("TimeoutServletGet-");
                final AsyncContext ac = req.startAsync();
                ac.setTimeout(3000);
                
                ac.addListener(new TrackingListener(
                        false, completeOnTimeout, dispatchUrl));
            } else
                resp.getWriter().print("FAIL: Async unsupported");
        }

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        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            resp.getWriter().write("DispatchingServletGet-");
            resp.flushBuffer();
            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) {
                        ctxt.dispatch("/stage1?" + ITER_PARAM + "=" + iter);
                    } else {
                        ctxt.dispatch("/stage2");
                    }
                }
            };
            if ("y".equals(req.getParameter("useThread"))) {
                new Thread(run).start();

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            resp.flushBuffer();


            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() {
                    if (first) {
                        ctxt.dispatch("/stage1");
                    } else {
                        ctxt.dispatch("/stage2");
                    }
                }
            };
            if ("y".equals(req.getParameter("useThread"))) {
                new Thread(run).start();

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        @Override
        protected void doGet(HttpServletRequest request,
                HttpServletResponse response)
                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() {
                    try {
                        Thread.sleep(3 * 1000);
                        asyncContext.getResponse().getWriter().write(
                                "Runnable-");
                        asyncContext.complete();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });

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        protected void doGet(final HttpServletRequest req,
                final HttpServletResponse resp)
                throws ServletException, IOException {


            String echo = req.getParameter("echo");
            AsyncContext actxt = req.startAsync();
            resp.setContentType("text/plain");
            resp.getWriter().print("OK");
            if (echo != null) {
                resp.getWriter().print("-" + echo);
            }
            // Speed up the test by reducing the timeout
            actxt.setTimeout(ASYNC_TIMEOUT);
        }

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        @Override
        protected void doGet(final HttpServletRequest req,
                final HttpServletResponse resp)
                throws ServletException, IOException {


            AsyncContext actxt = req.startAsync();
            actxt.setTimeout(3000);
            resp.setContentType("text/plain");
            resp.getWriter().print("OK");
            actxt.complete();
        }

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        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            if (req.isAsyncSupported()) {
                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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                }
            }
            resp.getWriter().write("DispatchingServletGet-");
            resp.flushBuffer();
            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) {
                        ctxt.dispatch("/stage1?" + ITER_PARAM + "=" + iter +
                                "&" + DISPATCH_CHECK + "=y");
                    } else {
                        ctxt.dispatch("/stage2");
                    }
                }
            };
            if ("y".equals(req.getParameter("useThread"))) {
                new Thread(run).start();

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