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

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


        System.out.println("====filter servlet 1  before");


        final AsyncContext asyncContext = req.startAsync();
        asyncContext.setTimeout(10L * 1000);
        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(final AsyncEvent event) throws IOException {
                System.out.println("=====async complete");
            }


            @Override
            public void onTimeout(final AsyncEvent event) throws IOException {
            }


            @Override
            public void onError(final AsyncEvent event) throws IOException {
            }


            @Override
            public void onStartAsync(final AsyncEvent event) throws IOException {
            }
        });


        System.out.println("====filter servlet 1  before dispatch");
        //异步下分派过去的请求，异步filter也可以拦截
        //如果filter不是DispatcherType.ASYNC 类型，那么分派到/filter2时，拦截器不会调用
        asyncContext.dispatch("/filter2");
        System.out.println("====filter servlet 1  after dispatch");


        System.out.println("====filter servlet 1  after");

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


        System.out.println("====filter servlet 2  before");


        final AsyncContext asyncContext = req.startAsync();
        asyncContext.setTimeout(10L * 1000);
        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(final AsyncEvent event) throws IOException {
                System.out.println("=====async complete");
            }


            @Override
            public void onTimeout(final AsyncEvent event) throws IOException {
            }


            @Override
            public void onError(final AsyncEvent event) throws IOException {
            }


            @Override
            public void onStartAsync(final AsyncEvent event) throws IOException {
            }
        });


        System.out.println("====filter servlet 2  before dispatch");
        req.setAttribute("msg", "success");
        asyncContext.dispatch("/WEB-INF/jsp/dispatch.jsp");
        System.out.println("====filter servlet 2  after dispatch");


        System.out.println("====filter servlet 2  after");

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public class ListenerServlet2 extends HttpServlet {




    @Override
    protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
        final AsyncContext asyncContext = req.startAsync();
        asyncContext.setTimeout(10 * 1000);
        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(final AsyncEvent event) throws IOException {
                System.out.println("=====async complete");
            }


            @Override
            public void onTimeout(final AsyncEvent event) throws IOException {
                System.out.println("=====async timeout");
                asyncContext.complete(); //需要调用下complete 否则按超时时间（比如当前设置的是10秒）重新调度一次当前方法
            }


            @Override
            public void onError(final AsyncEvent event) throws IOException {
                System.out.println("=====async error");
            }


            @Override
            public void onStartAsync(final AsyncEvent event) throws IOException {
                System.out.println("=====start new async");
            }
        });
        asyncContext.dispatch("/error"); //分派到一个不存在的地址 会报404，但是最终服务器会调用onComplete来完成异步
    }

View Full Code Here

    }




    public void startAsync(HttpServletRequest req, final String username) {
        //1、开启异步
        final AsyncContext asyncContext = req.startAsync();
        asyncContext.setTimeout(30L * 1000);


        //将异步上下文加入到队列中，这样在未来可以推送消息
        Queue<AsyncContext> queue = usernameToAsyncContextMap.get(username);
        if(queue == null) {
            queue = new ConcurrentLinkedDeque();
            usernameToAsyncContextMap.put(username, queue);
        }


        queue.add(asyncContext);


        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(final AsyncEvent event) throws IOException {
                Queue<AsyncContext> queue = usernameToAsyncContextMap.get(username);
                if(queue != null) {
                    queue.remove(event.getAsyncContext());

View Full Code Here

                }
                Queue<AsyncContext> queue = usernameToAsyncContextMap.get(loginUsername);
                if(queue != null) {
                    Iterator<AsyncContext> iter = queue.iterator();
                    while(iter.hasNext()) {
                        AsyncContext asyncContext = iter.next();
                        try {
                            ServletResponse response = asyncContext.getResponse();
                            PrintWriter out = response.getWriter();
                            out.write(data);
                            out.flush();
                            asyncContext.complete();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        } else { //私人消息
            Queue<AsyncContext> queue = usernameToAsyncContextMap.get(receiver);
            if(queue != null) {
                Iterator<AsyncContext> iter = queue.iterator();
                while(iter.hasNext()) {
                    AsyncContext asyncContext = iter.next();
                    try {
                        ServletResponse response = asyncContext.getResponse();
                        PrintWriter out = response.getWriter();
                        out.write(data);
                        out.flush();
                        asyncContext.complete();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }

View Full Code Here

public class ListenerServlet1 extends HttpServlet {




    @Override
    protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
        final AsyncContext asyncContext = req.startAsync();
        asyncContext.setTimeout(2 * 1000);
        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(final AsyncEvent event) throws IOException {
                System.out.println("=====async complete");
            }


            @Override
            public void onTimeout(final AsyncEvent event) throws IOException {
                System.out.println("=====async timeout");
                asyncContext.complete(); //需要调用下complete 否则如jetty默认每2秒重新调度一次当前方法
            }


            @Override
            public void onError(final AsyncEvent event) throws IOException {
                System.out.println("=====async error");

View Full Code Here

public class ListenerServlet3 extends HttpServlet {




    @Override
    protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
        final AsyncContext asyncContext = req.startAsync();
        asyncContext.setTimeout(10 * 1000);


        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(final AsyncEvent event) throws IOException {
                System.out.println("=====async complete");
            }


            @Override
            public void onTimeout(final AsyncEvent event) throws IOException {
                System.out.println("=====async timeout");
                asyncContext.complete(); //需要调用下complete 否则如jetty默认每2秒重新调度一次当前方法
            }


            @Override
            public void onError(final AsyncEvent event) throws IOException {
                System.out.println("=====async error");

View Full Code Here


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


        System.out.println("===before start async:" + req.isAsyncStarted());
        final AsyncContext asyncContext = req.startAsync();
        System.out.println("===after start async:" + req.isAsyncStarted());


        asyncContext.setTimeout(10L * 1000);
        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(final AsyncEvent event) throws IOException {
                System.out.println("=====async complete");
            }


            @Override
            public void onTimeout(final AsyncEvent event) throws IOException {
                System.out.println("=====async timeout");
            }


            @Override
            public void onError(final AsyncEvent event) throws IOException {
            }


            @Override
            public void onStartAsync(final AsyncEvent event) throws IOException {
            }
        });


        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(3L * 1000);
                } catch (InterruptedException e) {
                }
                req.setAttribute("ok", "true");
                req.setAttribute("msg", "success");
                asyncContext.dispatch("/WEB-INF/jsp/dispatch.jsp");
            }
        }).start();


    }

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


        if(req.getAttribute("ok") == null) {
            System.out.println("===before start async:" + req.isAsyncStarted());
            final AsyncContext asyncContext = req.startAsync();
            System.out.println("===after start async:" + req.isAsyncStarted());


            asyncContext.setTimeout(10L * 1000);
            asyncContext.addListener(new AsyncListener() {
                @Override
                public void onComplete(final AsyncEvent event) throws IOException {
                    System.out.println("=====async complete");
                }


                @Override
                public void onTimeout(final AsyncEvent event) throws IOException {
                }


                @Override
                public void onError(final AsyncEvent event) throws IOException {
                }


                @Override
                public void onStartAsync(final AsyncEvent event) throws IOException {
                }
            });


            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        Thread.sleep(3L * 1000);
                    } catch (InterruptedException e) {
                    }
                    req.setAttribute("ok", "true");
                    req.setAttribute("msg", "success");
                    asyncContext.dispatch();
                    System.out.println("===after dispatch before handle:" + req.isAsyncStarted());
                }
            }).start();


            return;

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        System.out.println(req.getAttribute(AsyncContext.ASYNC_QUERY_STRING));
        System.out.println(req.getAttribute(AsyncContext.ASYNC_SERVLET_PATH));


        if(req.getAttribute("ok1") == null) {
            System.out.println("===before start async:" + req.isAsyncStarted());
            final AsyncContext asyncContext = req.startAsync();
            System.out.println("===after start async:" + req.isAsyncStarted());


            asyncContext.setTimeout(10L * 1000);
            asyncContext.addListener(new AsyncListener() {
                @Override
                public void onComplete(final AsyncEvent event) throws IOException {
                    System.out.println("=====async complete");
                }


                @Override
                public void onTimeout(final AsyncEvent event) throws IOException {
                }


                @Override
                public void onError(final AsyncEvent event) throws IOException {
                }


                @Override
                public void onStartAsync(final AsyncEvent event) throws IOException {
                }
            });


            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        Thread.sleep(3L * 1000);
                    } catch (InterruptedException e) {
                    }
                    req.setAttribute("ok1", "true");
                    req.setAttribute("msg", "success");
                    asyncContext.dispatch();
                    System.out.println("===after dispatch before handle:" + req.isAsyncStarted());
                }
            }).start();


            return;

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