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

    private final static Logger LOG = Logger.getLogger(CometEscalator.class.getName());


    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        AsyncContext startAsync = request.startAsync();
        String channel = extractChannel(request.getRequestURI());
        events.fire(new BrowserWindow(startAsync, channel));
        LOG.fine("Event sent for channel " + channel);
    }

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            super(request, trustResolver, rolePrefix);
            this.response = response;
        }


        public AsyncContext getAsyncContext() {
            AsyncContext asyncContext = super.getAsyncContext();
            return new SecurityContextAsyncContext(asyncContext);
        }

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            AsyncContext asyncContext = super.getAsyncContext();
            return new SecurityContextAsyncContext(asyncContext);
        }


        public AsyncContext startAsync() {
            AsyncContext startAsync = super.startAsync();
            return new SecurityContextAsyncContext(startAsync);
        }

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            return new SecurityContextAsyncContext(startAsync);
        }


        public AsyncContext startAsync(ServletRequest servletRequest, ServletResponse servletResponse)
                throws IllegalStateException {
            AsyncContext startAsync = super.startAsync(servletRequest, servletResponse);
            return new SecurityContextAsyncContext(startAsync);
        }

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     * @param request
     * @param response
     */
    @RequestMapping("/async")
    public void asynch(HttpServletRequest request, HttpServletResponse response) {
        final AsyncContext async = request.startAsync();
        async.start(new Runnable() {
            public void run() {
                Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
                try {
                    final HttpServletResponse asyncResponse = (HttpServletResponse) async.getResponse();
                    asyncResponse.setStatus(HttpServletResponse.SC_OK);
                    asyncResponse.getWriter().write(String.valueOf(authentication));
                    async.complete();
                } catch(Exception e) {
                    throw new RuntimeException(e);
                }
            }
        });

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        ArgumentCaptor<Runnable> runnableCaptor = ArgumentCaptor.forClass(Runnable.class);
        SecurityContext context = SecurityContextHolder.createEmptyContext();
        TestingAuthenticationToken expectedAuth = new TestingAuthenticationToken("user", "password","ROLE_USER");
        context.setAuthentication(expectedAuth);
        SecurityContextHolder.setContext(context);
        AsyncContext asyncContext = mock(AsyncContext.class);
        when(request.getAsyncContext()).thenReturn(asyncContext);
        Runnable runnable = new Runnable() {
            public void run() {}
        };

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        ArgumentCaptor<Runnable> runnableCaptor = ArgumentCaptor.forClass(Runnable.class);
        SecurityContext context = SecurityContextHolder.createEmptyContext();
        TestingAuthenticationToken expectedAuth = new TestingAuthenticationToken("user", "password","ROLE_USER");
        context.setAuthentication(expectedAuth);
        SecurityContextHolder.setContext(context);
        AsyncContext asyncContext = mock(AsyncContext.class);
        when(request.startAsync()).thenReturn(asyncContext);
        Runnable runnable = new Runnable() {
            public void run() {}
        };

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        ArgumentCaptor<Runnable> runnableCaptor = ArgumentCaptor.forClass(Runnable.class);
        SecurityContext context = SecurityContextHolder.createEmptyContext();
        TestingAuthenticationToken expectedAuth = new TestingAuthenticationToken("user", "password","ROLE_USER");
        context.setAuthentication(expectedAuth);
        SecurityContextHolder.setContext(context);
        AsyncContext asyncContext = mock(AsyncContext.class);
        when(request.startAsync(request,response)).thenReturn(asyncContext);
        Runnable runnable = new Runnable() {
            public void run() {}
        };

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        out.println("</p>");
        out.println("<br><br>");


        out.flush();


        AsyncContext ctx =req.startAsync();
        new Thread(new TaskExecutor(ctx)).start();


        out.println("<p id='b'>");
        out.println("Task assigned to executor.Servlet finishes at: " + "<font color='red'>" + new Date() + " -> <b id='sft'>" + System.currentTimeMillis() + "</b></font>" + ".");
        out.println("</p>");

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        PrintWriter out = resp.getWriter();
        out.write("hello async");
        out.write("<br/>");
        out.flush();
        //1、开启异步
        final AsyncContext asyncContext = req.startAsync();
        //2、设置超时时间，如果不设置如jetty是30000L
        asyncContext.setTimeout(10L * 1000); //设置为0表示永不超时


        //把任务提交给自己的任务队列
        executorService.submit(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(3L * 1000);
                    PrintWriter out = asyncContext.getResponse().getWriter();
                    out.write("over");
                    asyncContext.complete();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

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