Examples with AsyncListener javax.servlet.AsyncListener used on opensource projects

Example 6 with AsyncListener

use of javax.servlet.AsyncListener in project jetty.project by eclipse.

the class HttpChannelState method onTimeout.

protected void onTimeout() {
    final List<AsyncListener> listeners;
    AsyncContextEvent event;
    try (Locker.Lock lock = _locker.lock()) {
        if (LOG.isDebugEnabled())
            LOG.debug("onTimeout {}", toStringLocked());
        if (_async != Async.STARTED)
            return;
        _async = Async.EXPIRING;
        event = _event;
        listeners = _asyncListeners;
    }
    final AtomicReference<Throwable> error = new AtomicReference<>();
    if (listeners != null) {
        Runnable task = new Runnable() {

            @Override
            public void run() {
                for (AsyncListener listener : listeners) {
                    try {
                        listener.onTimeout(event);
                    } catch (Throwable x) {
                        LOG.warn(x + " while invoking onTimeout listener " + listener);
                        LOG.debug(x);
                        if (error.get() == null)
                            error.set(x);
                        else
                            error.get().addSuppressed(x);
                    }
                }
            }

            @Override
            public String toString() {
                return "onTimeout";
            }
        };
        runInContext(event, task);
    }
    Throwable th = error.get();
    boolean dispatch = false;
    try (Locker.Lock lock = _locker.lock()) {
        switch(_async) {
            case EXPIRING:
                _async = th == null ? Async.EXPIRED : Async.ERRORING;
                break;
            case COMPLETE:
            case DISPATCH:
                if (th != null) {
                    LOG.ignore(th);
                    th = null;
                }
                break;
            default:
                throw new IllegalStateException();
        }
        if (_state == State.ASYNC_WAIT) {
            _state = State.ASYNC_WOKEN;
            dispatch = true;
        }
    }
    if (th != null) {
        if (LOG.isDebugEnabled())
            LOG.debug("Error after async timeout {}", this, th);
        onError(th);
    }
    if (dispatch) {
        if (LOG.isDebugEnabled())
            LOG.debug("Dispatch after async timeout {}", this);
        scheduleDispatch();
    }
}

Example 7 with AsyncListener

use of javax.servlet.AsyncListener in project jetty.project by eclipse.

the class HttpChannelState method onError.

protected void onError(Throwable failure) {
    final List<AsyncListener> listeners;
    final AsyncContextEvent event;
    final Request baseRequest = _channel.getRequest();
    int code = HttpStatus.INTERNAL_SERVER_ERROR_500;
    String reason = null;
    if (failure instanceof BadMessageException) {
        BadMessageException bme = (BadMessageException) failure;
        code = bme.getCode();
        reason = bme.getReason();
    } else if (failure instanceof UnavailableException) {
        if (((UnavailableException) failure).isPermanent())
            code = HttpStatus.NOT_FOUND_404;
        else
            code = HttpStatus.SERVICE_UNAVAILABLE_503;
    }
    try (Locker.Lock lock = _locker.lock()) {
        if (LOG.isDebugEnabled())
            LOG.debug("onError {} {}", toStringLocked(), failure);
        // Set error on request.
        if (_event != null) {
            _event.addThrowable(failure);
            _event.getSuppliedRequest().setAttribute(ERROR_STATUS_CODE, code);
            _event.getSuppliedRequest().setAttribute(ERROR_EXCEPTION, failure);
            _event.getSuppliedRequest().setAttribute(RequestDispatcher.ERROR_EXCEPTION_TYPE, failure == null ? null : failure.getClass());
            _event.getSuppliedRequest().setAttribute(ERROR_MESSAGE, reason);
        } else {
            Throwable error = (Throwable) baseRequest.getAttribute(ERROR_EXCEPTION);
            if (error != null)
                throw new IllegalStateException("Error already set", error);
            baseRequest.setAttribute(ERROR_STATUS_CODE, code);
            baseRequest.setAttribute(ERROR_EXCEPTION, failure);
            baseRequest.setAttribute(RequestDispatcher.ERROR_EXCEPTION_TYPE, failure == null ? null : failure.getClass());
            baseRequest.setAttribute(ERROR_MESSAGE, reason);
        }
        // Are we blocking?
        if (_async == Async.NOT_ASYNC) {
            // Only called from within HttpChannel Handling, so much be dispatched, let's stay dispatched!
            if (_state == State.DISPATCHED) {
                _state = State.THROWN;
                return;
            }
            throw new IllegalStateException(this.getStatusStringLocked());
        }
        // We are Async
        _async = Async.ERRORING;
        listeners = _asyncListeners;
        event = _event;
    }
    if (listeners != null) {
        Runnable task = new Runnable() {

            @Override
            public void run() {
                for (AsyncListener listener : listeners) {
                    try {
                        listener.onError(event);
                    } catch (Throwable x) {
                        LOG.warn(x + " while invoking onError listener " + listener);
                        LOG.debug(x);
                    }
                }
            }

            @Override
            public String toString() {
                return "onError";
            }
        };
        runInContext(event, task);
    }
    boolean dispatch = false;
    try (Locker.Lock lock = _locker.lock()) {
        switch(_async) {
            case ERRORING:
                {
                    // Still in this state ? The listeners did not invoke API methods
                    // and the container must provide a default error dispatch.
                    _async = Async.ERRORED;
                    break;
                }
            case DISPATCH:
            case COMPLETE:
                {
                    // The listeners called dispatch() or complete().
                    break;
                }
            default:
                {
                    throw new IllegalStateException(toString());
                }
        }
        if (_state == State.ASYNC_WAIT) {
            _state = State.ASYNC_WOKEN;
            dispatch = true;
        }
    }
    if (dispatch) {
        if (LOG.isDebugEnabled())
            LOG.debug("Dispatch after error {}", this);
        scheduleDispatch();
    }
}

Example 8 with AsyncListener

use of javax.servlet.AsyncListener in project jetty.project by eclipse.

the class HttpChannelState method onComplete.

protected void onComplete() {
    final List<AsyncListener> aListeners;
    final AsyncContextEvent event;
    try (Locker.Lock lock = _locker.lock()) {
        if (LOG.isDebugEnabled())
            LOG.debug("onComplete {}", toStringLocked());
        switch(_state) {
            case COMPLETING:
                aListeners = _asyncListeners;
                event = _event;
                _state = State.COMPLETED;
                _async = Async.NOT_ASYNC;
                break;
            default:
                throw new IllegalStateException(this.getStatusStringLocked());
        }
    }
    if (event != null) {
        if (aListeners != null) {
            Runnable callback = new Runnable() {

                @Override
                public void run() {
                    for (AsyncListener listener : aListeners) {
                        try {
                            listener.onComplete(event);
                        } catch (Throwable e) {
                            LOG.warn(e + " while invoking onComplete listener " + listener);
                            LOG.debug(e);
                        }
                    }
                }

                @Override
                public String toString() {
                    return "onComplete";
                }
            };
            runInContext(event, callback);
        }
        event.completed();
    }
}

Example 9 with AsyncListener

use of javax.servlet.AsyncListener in project jetty.project by eclipse.

the class Dump method doGet.

/* ------------------------------------------------------------ */
@Override
public void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
    if (request.getRemoteUser() == null) {
        try {
            request.login("user", "password");
        } catch (ServletException se) {
            getServletContext().log(se.toString());
        }
    }
    // Handle a dump of data
    final String data = request.getParameter("data");
    final String chars = request.getParameter("chars");
    final String block = request.getParameter("block");
    final String dribble = request.getParameter("dribble");
    final boolean flush = request.getParameter("flush") != null ? Boolean.parseBoolean(request.getParameter("flush")) : false;
    if (request.getPathInfo() != null && request.getPathInfo().toLowerCase(Locale.ENGLISH).indexOf("script") != -1) {
        response.sendRedirect(response.encodeRedirectURL(getServletContext().getContextPath() + "/dump/info"));
        return;
    }
    request.setCharacterEncoding("UTF-8");
    if (request.getParameter("busy") != null) {
        long end = System.currentTimeMillis() + Long.parseLong(request.getParameter("busy"));
        while (System.currentTimeMillis() < end) {
        }
    }
    if (request.getParameter("empty") != null) {
        response.setStatus(200);
        response.flushBuffer();
        return;
    }
    if (request.getParameter("sleep") != null) {
        try {
            long s = Long.parseLong(request.getParameter("sleep"));
            if (request.getHeader("Expect") != null && request.getHeader("Expect").indexOf("102") >= 0) {
                Thread.sleep(s / 2);
                response.sendError(102);
                Thread.sleep(s / 2);
            } else
                Thread.sleep(s);
        } catch (InterruptedException e) {
            return;
        } catch (Exception e) {
            throw new ServletException(e);
        }
    }
    if (request.getParameter("startAsync") != null && request.getAttribute("ASYNC") != Boolean.TRUE) {
        request.setAttribute("ASYNC", Boolean.TRUE);
        try {
            final AsyncContext async = request.startAsync(request, response);
            async.setTimeout(Long.parseLong(request.getParameter("startAsync")));
            async.addListener(new AsyncListener() {

                @Override
                public void onTimeout(AsyncEvent event) throws IOException {
                    response.addHeader("Dump", "onTimeout");
                    try {
                        if (!dump(response, data, chars, block, dribble, flush)) {
                            response.setContentType("text/plain");
                            response.getOutputStream().println("EXPIRED");
                        }
                        async.complete();
                    } catch (IOException e) {
                        getServletContext().log("", e);
                    }
                }

                @Override
                public void onStartAsync(AsyncEvent event) throws IOException {
                    response.addHeader("Dump", "onStartAsync");
                }

                @Override
                public void onError(AsyncEvent event) throws IOException {
                    response.addHeader("Dump", "onError");
                }

                @Override
                public void onComplete(AsyncEvent event) throws IOException {
                    response.addHeader("Dump", "onComplete");
                }
            });
            if (request.getParameter("dispatch") != null) {
                request.setAttribute("RESUME", Boolean.TRUE);
                final long resume = Long.parseLong(request.getParameter("dispatch"));
                _timer.schedule(new TimerTask() {

                    @Override
                    public void run() {
                        async.dispatch();
                    }
                }, resume);
            }
            if (request.getParameter("complete") != null) {
                final long complete = Long.parseLong(request.getParameter("complete"));
                _timer.schedule(new TimerTask() {

                    @Override
                    public void run() {
                        try {
                            response.setContentType("text/html");
                            response.getOutputStream().println("<h1>COMPLETED</h1>");
                            async.complete();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }, complete);
            }
            return;
        } catch (Exception e) {
            throw new ServletException(e);
        }
    }
    request.setAttribute("Dump", this);
    getServletContext().setAttribute("Dump", this);
    // getServletContext().log("dump "+request.getRequestURI());
    // Force a content length response
    String length = request.getParameter("length");
    if (length != null && length.length() > 0) {
        response.setContentLength(Integer.parseInt(length));
    }
    // Handle a dump of data
    if (dump(response, data, chars, block, dribble, flush))
        return;
    // handle an exception
    String info = request.getPathInfo();
    if (info != null && info.endsWith("Exception")) {
        try {
            throw (Throwable) Thread.currentThread().getContextClassLoader().loadClass(info.substring(1)).newInstance();
        } catch (Throwable th) {
            throw new ServletException(th);
        }
    }
    // test a reset
    String reset = request.getParameter("reset");
    if (reset != null && reset.length() > 0) {
        response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
        response.setHeader("SHOULD_NOT", "BE SEEN");
        response.reset();
    }
    // handle an redirect
    String redirect = request.getParameter("redirect");
    if (redirect != null && redirect.length() > 0) {
        response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
        response.sendRedirect(response.encodeRedirectURL(redirect));
        try {
            response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
        } catch (IOException e) {
        // ignored as stream is closed.
        }
        return;
    }
    // handle an error
    String error = request.getParameter("error");
    if (error != null && error.length() > 0 && request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE) == null) {
        response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
        response.sendError(Integer.parseInt(error));
        try {
            response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
        } catch (IllegalStateException e) {
            try {
                response.getWriter().println("NOR THIS!!");
            } catch (IOException e2) {
            }
        } catch (IOException e) {
        }
        return;
    }
    // Handle a extra headers
    String headers = request.getParameter("headers");
    if (headers != null && headers.length() > 0) {
        long h = Long.parseLong(headers);
        for (int i = 0; i < h; i++) response.addHeader("Header" + i, "Value" + i);
    }
    String buffer = request.getParameter("buffer");
    if (buffer != null && buffer.length() > 0)
        response.setBufferSize(Integer.parseInt(buffer));
    String charset = request.getParameter("charset");
    if (charset == null)
        charset = "UTF-8";
    response.setCharacterEncoding(charset);
    response.setContentType("text/html");
    if (info != null && info.indexOf("Locale/") >= 0) {
        try {
            String locale_name = info.substring(info.indexOf("Locale/") + 7);
            Field f = java.util.Locale.class.getField(locale_name);
            response.setLocale((Locale) f.get(null));
        } catch (Exception e) {
            e.printStackTrace();
            response.setLocale(Locale.getDefault());
        }
    }
    String cn = request.getParameter("cookie");
    String cv = request.getParameter("cookiev");
    if (cn != null && cv != null) {
        Cookie cookie = new Cookie(cn, cv);
        if (request.getParameter("version") != null)
            cookie.setVersion(Integer.parseInt(request.getParameter("version")));
        cookie.setComment("Cookie from dump servlet");
        response.addCookie(cookie);
    }
    String pi = request.getPathInfo();
    if (pi != null && pi.startsWith("/ex")) {
        OutputStream out = response.getOutputStream();
        out.write("</H1>This text should be reset</H1>".getBytes());
        if ("/ex0".equals(pi))
            throw new ServletException("test ex0", new Throwable());
        else if ("/ex1".equals(pi))
            throw new IOException("test ex1");
        else if ("/ex2".equals(pi))
            throw new UnavailableException("test ex2");
        else if (pi.startsWith("/ex3/"))
            throw new UnavailableException("test ex3", Integer.parseInt(pi.substring(5)));
        throw new RuntimeException("test");
    }
    if ("true".equals(request.getParameter("close")))
        response.setHeader("Connection", "close");
    String buffered = request.getParameter("buffered");
    PrintWriter pout = null;
    try {
        pout = response.getWriter();
    } catch (IllegalStateException e) {
        pout = new PrintWriter(new OutputStreamWriter(response.getOutputStream(), charset));
    }
    if (buffered != null)
        pout = new PrintWriter(new BufferedWriter(pout, Integer.parseInt(buffered)));
    try {
        pout.write("<html>\n<body>\n");
        pout.write("<h1>Dump Servlet</h1>\n");
        pout.write("<table width=\"95%\">");
        pout.write("<tr>\n");
        pout.write("<th align=\"right\">getContentLength:&nbsp;</th>");
        pout.write("<td>" + Integer.toString(request.getContentLength()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getContentType:&nbsp;</th>");
        pout.write("<td>" + notag(request.getContentType()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getContextPath:&nbsp;</th>");
        pout.write("<td>" + request.getContextPath() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getDispatcherType:&nbsp;</th>");
        pout.write("<td>" + request.getDispatcherType() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getLocale:&nbsp;</th>");
        pout.write("<td>" + request.getLocale() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getLocalName:&nbsp;</th>");
        pout.write("<td>" + request.getLocalName() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getLocalAddr:&nbsp;</th>");
        pout.write("<td>" + request.getLocalAddr() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getLocalPort:&nbsp;</th>");
        pout.write("<td>" + Integer.toString(request.getLocalPort()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getMethod:&nbsp;</th>");
        pout.write("<td>" + notag(request.getMethod()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getPathInfo:&nbsp;</th>");
        pout.write("<td>" + notag(request.getPathInfo()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getPathTranslated:&nbsp;</th>");
        pout.write("<td>" + notag(request.getPathTranslated()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getProtocol:&nbsp;</th>");
        pout.write("<td>" + request.getProtocol() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getQueryString:&nbsp;</th>");
        pout.write("<td>" + notag(request.getQueryString()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getRemoteAddr:&nbsp;</th>");
        pout.write("<td>" + request.getRemoteAddr() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getRemoteHost:&nbsp;</th>");
        pout.write("<td>" + request.getRemoteHost() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getRemotePort:&nbsp;</th>");
        pout.write("<td>" + request.getRemotePort() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getRemoteUser:&nbsp;</th>");
        pout.write("<td>" + request.getRemoteUser() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getRequestedSessionId:&nbsp;</th>");
        pout.write("<td>" + request.getRequestedSessionId() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getRequestURI:&nbsp;</th>");
        pout.write("<td>" + notag(request.getRequestURI()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getRequestURL:&nbsp;</th>");
        pout.write("<td>" + notag(request.getRequestURL().toString()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getScheme:&nbsp;</th>");
        pout.write("<td>" + request.getScheme() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getServerName:&nbsp;</th>");
        pout.write("<td>" + notag(request.getServerName()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getServletPath:&nbsp;</th>");
        pout.write("<td>" + notag(request.getServletPath()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getServerPort:&nbsp;</th>");
        pout.write("<td>" + Integer.toString(request.getServerPort()) + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">getUserPrincipal:&nbsp;</th>");
        pout.write("<td>" + request.getUserPrincipal() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">isAsyncStarted():&nbsp;</th>");
        pout.write("<td>" + request.isAsyncStarted() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">isAsyncSupported():&nbsp;</th>");
        pout.write("<td>" + request.isAsyncSupported() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">isSecure():&nbsp;</th>");
        pout.write("<td>" + request.isSecure() + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">isUserInRole(admin):&nbsp;</th>");
        pout.write("<td>" + request.isUserInRole("admin") + "</td>");
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"right\">encodeRedirectURL(/foo?bar):&nbsp;</th>");
        pout.write("<td>" + response.encodeRedirectURL("/foo?bar") + "</td>");
        Enumeration<Locale> locales = request.getLocales();
        while (locales.hasMoreElements()) {
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getLocales:&nbsp;</th>");
            pout.write("<td>" + locales.nextElement() + "</td>");
        }
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Other HTTP Headers:</big></th>");
        Enumeration<String> h = request.getHeaderNames();
        String name;
        while (h.hasMoreElements()) {
            name = (String) h.nextElement();
            Enumeration<String> h2 = request.getHeaders(name);
            while (h2.hasMoreElements()) {
                String hv = (String) h2.nextElement();
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">" + notag(name) + ":&nbsp;</th>");
                pout.write("<td>" + notag(hv) + "</td>");
            }
        }
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Request Parameters:</big></th>");
        h = request.getParameterNames();
        while (h.hasMoreElements()) {
            name = (String) h.nextElement();
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">" + notag(name) + ":&nbsp;</th>");
            pout.write("<td>" + notag(request.getParameter(name)) + "</td>");
            String[] values = request.getParameterValues(name);
            if (values == null) {
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">" + notag(name) + " Values:&nbsp;</th>");
                pout.write("<td>" + "NULL!" + "</td>");
            } else if (values.length > 1) {
                for (int i = 0; i < values.length; i++) {
                    pout.write("</tr><tr>\n");
                    pout.write("<th align=\"right\">" + notag(name) + "[" + i + "]:&nbsp;</th>");
                    pout.write("<td>" + notag(values[i]) + "</td>");
                }
            }
        }
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Cookies:</big></th>");
        Cookie[] cookies = request.getCookies();
        for (int i = 0; cookies != null && i < cookies.length; i++) {
            Cookie cookie = cookies[i];
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">" + notag(cookie.getName()) + ":&nbsp;</th>");
            pout.write("<td>" + notag(cookie.getValue()) + "</td>");
        }
        String content_type = request.getContentType();
        if (content_type != null && !content_type.startsWith("application/x-www-form-urlencoded") && !content_type.startsWith("multipart/form-data")) {
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" valign=\"top\" colspan=\"2\"><big><br/>Content:</big></th>");
            pout.write("</tr><tr>\n");
            pout.write("<td><pre>");
            char[] content = new char[4096];
            int len;
            try {
                Reader in = request.getReader();
                while ((len = in.read(content)) >= 0) pout.write(notag(new String(content, 0, len)));
            } catch (IOException e) {
                pout.write(e.toString());
            }
            pout.write("</pre></td>");
        }
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Request Attributes:</big></th>");
        Enumeration<String> a = request.getAttributeNames();
        while (a.hasMoreElements()) {
            name = (String) a.nextElement();
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\" valign=\"top\">" + name.replace(".", " .") + ":&nbsp;</th>");
            Object value = request.getAttribute(name);
            if (value instanceof File) {
                File file = (File) value;
                pout.write("<td>" + "<pre>" + file.getName() + " (" + file.length() + " " + new Date(file.lastModified()) + ")</pre>" + "</td>");
            } else
                pout.write("<td>" + "<pre>" + toString(request.getAttribute(name)) + "</pre>" + "</td>");
        }
        request.setAttribute("org.eclipse.jetty.servlet.MultiPartFilter.files", null);
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Servlet InitParameters:</big></th>");
        a = getInitParameterNames();
        while (a.hasMoreElements()) {
            name = (String) a.nextElement();
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">" + name + ":&nbsp;</th>");
            pout.write("<td>" + toString(getInitParameter(name)) + "</td>");
        }
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Context InitParameters:</big></th>");
        a = getServletContext().getInitParameterNames();
        while (a.hasMoreElements()) {
            name = (String) a.nextElement();
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\" valign=\"top\">" + name.replace(".", " .") + ":&nbsp;</th>");
            pout.write("<td>" + toString(getServletContext().getInitParameter(name)) + "</td>");
        }
        pout.write("</tr><tr>\n");
        pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Context Attributes:</big></th>");
        a = getServletContext().getAttributeNames();
        while (a.hasMoreElements()) {
            name = (String) a.nextElement();
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\" valign=\"top\">" + name.replace(".", " .") + ":&nbsp;</th>");
            pout.write("<td>" + "<pre>" + toString(getServletContext().getAttribute(name)) + "</pre>" + "</td>");
        }
        String res = request.getParameter("resource");
        if (res != null && res.length() > 0) {
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Get Resource: \"" + res + "\"</big></th>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getServletContext().getResource(...):&nbsp;</th>");
            try {
                pout.write("<td>" + getServletContext().getResource(res) + "</td>");
            } catch (Exception e) {
                pout.write("<td>" + "" + e + "</td>");
            }
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getServletContext().getResourcePaths(...):&nbsp;</th>");
            try {
                pout.write("<td>" + getServletContext().getResourcePaths(res) + "</td>");
            } catch (Exception e) {
                pout.write("<td>" + "" + e + "</td>");
            }
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getServletContext().getRealPath(...):&nbsp;</th>");
            try {
                pout.write("<td>" + getServletContext().getRealPath(res) + "</td>");
            } catch (Exception e) {
                pout.write("<td>" + "" + e + "</td>");
            }
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getServletContext().getContext(...):&nbsp;</th>");
            ServletContext context = getServletContext().getContext(res);
            pout.write("<td>" + context + "</td>");
            if (context != null) {
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">getServletContext().getContext(...).getResource(...):&nbsp;</th>");
                try {
                    pout.write("<td>" + context.getResource(res) + "</td>");
                } catch (Exception e) {
                    pout.write("<td>" + "" + e + "</td>");
                }
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">getServletContext().getContext(...).getResourcePaths(...):&nbsp;</th>");
                try {
                    pout.write("<td>" + context.getResourcePaths(res) + "</td>");
                } catch (Exception e) {
                    pout.write("<td>" + "" + e + "</td>");
                }
                String cp = context.getContextPath();
                if (cp == null || "/".equals(cp))
                    cp = "";
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">getServletContext().getContext(...).getRequestDispatcher(...):&nbsp;</th>");
                pout.write("<td>" + context.getRequestDispatcher(res.substring(cp.length())) + "</td>");
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">getServletContext().getContext(...).getRealPath(...):&nbsp;</th>");
                pout.write("<td>" + context.getRealPath(res.substring(cp.length())) + "</td>");
            }
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">this.getClass().getResource(...):&nbsp;</th>");
            pout.write("<td>" + this.getClass().getResource(res) + "</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">this.getClass().getClassLoader().getResource(...):&nbsp;</th>");
            pout.write("<td>" + this.getClass().getClassLoader().getResource(res) + "</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">Thread.currentThread().getContextClassLoader().getResource(...):&nbsp;</th>");
            pout.write("<td>" + Thread.currentThread().getContextClassLoader().getResource(res) + "</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">Thread.currentThread().getContextClassLoader().getResources(...):&nbsp;</th>");
            Enumeration<URL> urls = Thread.currentThread().getContextClassLoader().getResources(res);
            if (urls == null)
                pout.write("<td>null</td>");
            else
                pout.write("<td>" + Collections.list(urls) + "</td>");
        }
        pout.write("</tr></table>\n");
        /* ------------------------------------------------------------ */
        pout.write("<h2>Request Wrappers</h2>\n");
        ServletRequest rw = request;
        int w = 0;
        while (rw != null) {
            pout.write((w++) + ": " + rw.getClass().getName() + "<br/>");
            if (rw instanceof HttpServletRequestWrapper)
                rw = ((HttpServletRequestWrapper) rw).getRequest();
            else if (rw instanceof ServletRequestWrapper)
                rw = ((ServletRequestWrapper) rw).getRequest();
            else
                rw = null;
        }
        /* ------------------------------------------------------------ */
        pout.write("<h2>Response Wrappers</h2>\n");
        ServletResponse rsw = response;
        w = 0;
        while (rsw != null) {
            pout.write((w++) + ": " + rsw.getClass().getName() + "<br/>");
            if (rsw instanceof HttpServletResponseWrapper)
                rsw = ((HttpServletResponseWrapper) rsw).getResponse();
            else if (rsw instanceof ServletResponseWrapper)
                rsw = ((ServletResponseWrapper) rsw).getResponse();
            else
                rsw = null;
        }
        pout.write("<br/>");
        pout.write("<h2>International Characters (UTF-8)</h2>");
        pout.write("LATIN LETTER SMALL CAPITAL AE<br/>\n");
        pout.write("Directly uni encoded(\\u1d01): ᴁ<br/>");
        pout.write("HTML reference (&amp;AElig;): &AElig;<br/>");
        pout.write("Decimal (&amp;#7425;): &#7425;<br/>");
        pout.write("Javascript unicode (\\u1d01) : <script language='javascript'>document.write(\"ᴁ\");</script><br/>");
        pout.write("<br/>");
        pout.write("<h2>Form to generate GET content</h2>");
        pout.write("<form method=\"GET\" action=\"" + response.encodeURL(getURI(request)) + "\">");
        pout.write("TextField: <input type=\"text\" name=\"TextField\" value=\"value\"/><br/>\n");
        pout.write("<input type=\"submit\" name=\"Action\" value=\"Submit\">");
        pout.write("</form>");
        pout.write("<br/>");
        pout.write("<h2>Form to generate POST content</h2>");
        pout.write("<form method=\"POST\" accept-charset=\"utf-8\" action=\"" + response.encodeURL(getURI(request)) + "\">");
        pout.write("TextField: <input type=\"text\" name=\"TextField\" value=\"value\"/><br/>\n");
        pout.write("Select: <select multiple name=\"Select\">\n");
        pout.write("<option>ValueA</option>");
        pout.write("<option>ValueB1,ValueB2</option>");
        pout.write("<option>ValueC</option>");
        pout.write("</select><br/>");
        pout.write("<input type=\"submit\" name=\"Action\" value=\"Submit\"><br/>");
        pout.write("</form>");
        pout.write("<br/>");
        pout.write("<h2>Form to generate UPLOAD content</h2>");
        pout.write("<form method=\"POST\" enctype=\"multipart/form-data\" accept-charset=\"utf-8\" action=\"" + response.encodeURL(getURI(request)) + (request.getQueryString() == null ? "" : ("?" + request.getQueryString())) + "\">");
        pout.write("TextField: <input type=\"text\" name=\"TextField\" value=\"comment\"/><br/>\n");
        pout.write("File 1: <input type=\"file\" name=\"file1\" /><br/>\n");
        pout.write("File 2: <input type=\"file\" name=\"file2\" /><br/>\n");
        pout.write("<input type=\"submit\" name=\"Action\" value=\"Submit\"><br/>");
        pout.write("</form>");
        pout.write("<h2>Form to set Cookie</h2>");
        pout.write("<form method=\"POST\" action=\"" + response.encodeURL(getURI(request)) + "\">");
        pout.write("cookie: <input type=\"text\" name=\"cookie\" /><br/>\n");
        pout.write("value: <input type=\"text\" name=\"cookiev\" /><br/>\n");
        pout.write("<input type=\"submit\" name=\"Action\" value=\"setCookie\">");
        pout.write("</form>\n");
        pout.write("<h2>Form to get Resource</h2>");
        pout.write("<form method=\"POST\" action=\"" + response.encodeURL(getURI(request)) + "\">");
        pout.write("resource: <input type=\"text\" name=\"resource\" /><br/>\n");
        pout.write("<input type=\"submit\" name=\"Action\" value=\"getResource\">");
        pout.write("</form>\n");
    } catch (Exception e) {
        getServletContext().log("dump " + e);
    }
    String lines = request.getParameter("lines");
    if (lines != null) {
        char[] line = "<span>A line of characters. Blah blah blah blah.  blooble blooble</span></br>\n".toCharArray();
        for (int l = Integer.parseInt(lines); l-- > 0; ) {
            pout.write("<span>" + l + " </span>");
            pout.write(line);
        }
    }
    pout.write("</body>\n</html>\n");
    pout.close();
    if (pi != null) {
        if ("/ex4".equals(pi))
            throw new ServletException("test ex4", new Throwable());
        if ("/ex5".equals(pi))
            throw new IOException("test ex5");
        if ("/ex6".equals(pi))
            throw new UnavailableException("test ex6");
    }
}

Example 10 with AsyncListener

use of javax.servlet.AsyncListener in project JessMA by ldcsaa.

the class ActionSupport method startAsync.

/**
 * 启动异步任务
 *
 *  @param task			: 异步任务对象
 *  @param timeout		: 任务超时值（毫秒），应用框架会以 {@linkplain ActionSupport#getAsyncTimeoutResult()
 *  					  getAsyncTimeoutResult()} 得到的值作为 Action 的最终处理结果，并立刻返回到客户端。此时，
 *  					  {@linkplain AsyncTask} 的 {@linkplain AsyncTask#run() run()} 方法仍然继续执行，但会忽略其结果。
 *  					  <ul>
 *  						<li><b>小于 0：</b>使用 Web 容器的默认超时值</li>
 *  						<li><b>等于 0：</b>永不超时</li>
 *  						<li><b>大于 0：</b>使用设定的超时值</li>
 *  					  </ul>
 *  @param launcher		: 异步任务启动器，如果为 <b>null</b> 则使用容器内置的线程池启动异步任务。
 *  @param listeners	: 异步任务监听器，用于监听异步任务执行状态。
 *  @since				  Servlet 3.0
 */
protected void startAsync(AsyncTask task, long timeout, AsyncTaskLauncher launcher, AsyncListener... listeners) {
    HttpServletRequest request = getRequest();
    HttpServletResponse response = getResponse();
    if (!request.isAsyncSupported())
        throw new UnsupportedOperationException("async operation is not supported by current request");
    checkTaskType(task);
    AsyncContext ctx = request.startAsync(request, response);
    if (timeout >= 0)
        ctx.setTimeout(timeout);
    if (listeners != null) {
        for (AsyncListener listener : listeners) ctx.addListener(listener, request, response);
    }
    Runnable runner = new AsyncTaskRunner(ctx, task);
    if (launcher == null)
        ctx.start(runner);
    else
        launcher.start(runner);
}