@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.getWriter().write(super.getServletName());
AsyncContext asyncContext = req.startAsync();
asyncContext.setTimeout(0);
/*
* O metodo createListener() cria um listener da classe informada que
* deve extender AsyncListener. Este metodo adiciona suporte para a
* notacoes e injecao de dependencias dentro do listener criado, deste
* modo, objetos sao injetados dentro desse listener depois que ele é
* criado.
*/
MyAsyncListener myAsyncListener = asyncContext.createListener(MyAsyncListener.class);
/*
* O metodo addListener(AsyncListener) registra o listener informado ao
* AsyncContext em questao.
*/
asyncContext.addListener(myAsyncListener);
/*
* O metodo addListener() é sobrecarregado para receber um
* ServletRequest e um ServletResponse, que podem ser recuperados mais
* tarde dentro do listener atraves dos metodos getSuppliedRequest() e
* getSuppliedResponse() de AsyncEvent.
*/
// asyncContext.addListener(myAsyncListener, null, null);
AsyncTask task = new AsyncTask(asyncContext);
asyncContext.start(task);
}
@Override
public void run() {
// TODO Auto-generated method stub
CloseableHttpClient httpClient =
(CloseableHttpClient) asyncContext.getRequest().getAttribute("httpClient");
HttpGet get = new HttpGet(URL);
@SuppressWarnings("unchecked")
ResponseHandler<String> responseHandler =
(ResponseHandler<String>) asyncContext.getRequest().getAttribute("responseHandler");
String response = "";
try {
response = httpClient.execute(get, responseHandler);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String userID = asyncContext.getRequest().getParameter("userID");
Map<String, Object> params = new HashMap<String, Object>();
params.put("response", response);
params.put("patterns", patternMap);
params.put("userID", userID);
Transaction transaction = new GetUserBasicInfoTransaction();
try {
transaction.execute(params);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
asyncContext.complete();
}
public static void publishToActiveClients(String message) throws IOException {
message = "data: {\"msg\": \"" + message + "\"}\n\n";
for (AsyncContext ac : activeClients) {
ac.getResponse().getWriter().write(message);
ac.getResponse().getWriter().flush();
}
}
@Override
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();
} else {
run.run();
}
}
@Override
public void onEvent(byte[] data, long seq, boolean endOfBatch) throws Exception {
crc32.update(data);
long crc = crc32.getValue();
byte[] md5 = md5Digest.digest(data);
byte[] sha1 = sha1Digest.digest(data);
Data d = new Data(String.valueOf(crc), toHex(md5), toHex(sha1));
int size = contexts.size();
for (int i = 0; i < size; i++) {
AsyncContext context = contexts.poll();
if (null != context) {
context.getRequest().setAttribute("data", d);
try {
context.dispatch();
} catch (Exception e) {
}
} else {
break;
}
}
crc32.reset();
md5Digest.reset();
sha1Digest.reset();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.getWriter().write("DispatchingServletGet-");
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();
} else {
run.run();
}
}
@Override
public void onTimeout(AsyncEvent event) throws IOException {
// Remove before it's redispatched, so it won't be
// redispatched again at the end of the filtering.
AsyncContext asyncContext = event.getAsyncContext();
_queues[priority].remove(asyncContext);
asyncContext.dispatch();
}
SampleAsycListener(HttpServletRequest request, HttpServletResponse response)
throws IOException {
asyncContext = request.startAsync();
asyncContext.setTimeout(10000L);
asyncContext.addListener(this);
servletOutputStream = response.getOutputStream();
servletOutputStream.setWriteListener(this);
this.response = response;
}
/* ------------------------------------------------------------ */
@Override
public void suspend() {
_resumed = false;
_expired = false;
_context = _request.startAsync();
_context.setTimeout(_timeoutMs);
for (AsyncListener listener : _listeners) _context.addListener(listener);
_listeners.clear();
}
@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();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// Only set the status on the first call (the dispatch will trigger
// another call to this Servlet)
if (resp.getStatus() != HttpServletResponse.SC_BAD_REQUEST) {
resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
AsyncContext ac = req.startAsync();
ac.dispatch();
}
}
@Override
public void onTimeout(AsyncEvent event) throws IOException {
AsyncContext async = _async.get();
if (async != null && _async.compareAndSet(async, null)) {
HttpServletResponse response = (HttpServletResponse) async.getResponse();
response.setContentType("text/json;charset=utf-8");
PrintWriter out = response.getWriter();
out.print("{action:\"poll\"}");
async.complete();
}
}
@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");
}
/* ------------------------------------------------------------ */
@Override
public void suspend(ServletResponse response) {
_response = response;
_responseWrapped = response instanceof ServletResponseWrapper;
_resumed = false;
_expired = false;
_context = _request.startAsync();
_context.setTimeout(_timeoutMs);
for (AsyncListener listener : _listeners) _context.addListener(listener);
_listeners.clear();
}
/**
* Caso o response ja esteja fechado ou o metodo startAsync() ja tenha sido chamado, uma nova
* invocacao resultara em uma IllegalStateException.
*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
PrintWriter writer = resp.getWriter();
writer.println("Antes de iniciar a tarefa assincrona");
/*
* Para iniciar uma requisicao assincrona, basta chamar o metodo
* startAsync de ServletRequest. O metodo startAsync é sobrecarregado
* para receber um ServletRequest e um ServletResponse, desta forma é
* possivel passar wrappers para ele. Caso o metodo startAsync seja
* chamado, os objetos ServletRequest e Response originais serao
* utilizados.
*/
AsyncContext asyncContext = req.startAsync();
MyAsyncTask asyncTask = new MyAsyncTask(asyncContext, writer);
/*
* O tempo padrao de time out depende do container, geralmente está
* entre 5 e 10 segundos. Para desabilitar o time out basta informar um
* valor negativo ou 0. Esse metodo pode ser chamado antes ou depois do
* metodo start().
*/
asyncContext.setTimeout(-1);
/*
* A Interface AsyncContext possui metodos para configurar a tarefa
* assincrona e inicializar a mesma. O metodo estart recebe um runnable
* que sera responsavel por realizar o processamento da tarefa
* assincrona. Quando esse metodo é chamado, o processamento é realizado
* por outra Thread do pool de Threads do servidor.
*/
asyncContext.start(asyncTask);
/*
* Depois do start() da tarefa assincrona, o fluxo continua normalmente,
* e quando o metodo service() é encerrado, a resposta nao é commitada
* enquanto o metodo complete() de AsyncContext não for chamado. Desta
* forma, o container processa a tarefa assincrona um background em
* outra Thread.
*/
writer.println("Depois de iniciar a tarefa assincrona");
/*
* Retorna o AsyncContext inicializado para esse request. Caso o metodo
* startAsync() ainda nao tenha sido chamado, uma IllegalStateException
* ocorrera.
*/
req.getAsyncContext();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/event-stream");
response.setCharacterEncoding("UTF-8");
AsyncContext ac = request.startAsync();
ac.setTimeout(300000);
ac.addListener(
new AsyncListener() {
@Override
public void onTimeout(AsyncEvent ae) throws IOException {
activeClients.remove(ae.getAsyncContext());
publishToActiveClients(
ae.getAsyncContext().getRequest().getRemoteHost()
+ ":"
+ ae.getAsyncContext().getRequest().getRemotePort()
+ " has timedout...");
}
@Override
public void onError(AsyncEvent ae) throws IOException {
activeClients.remove(ae.getAsyncContext());
publishToActiveClients(
ae.getAsyncContext().getRequest().getRemoteHost()
+ ":"
+ ae.getAsyncContext().getRequest().getRemotePort()
+ " has errors...");
}
@Override
public void onComplete(AsyncEvent ae) throws IOException {
activeClients.remove(ae.getAsyncContext());
publishToActiveClients(
ae.getAsyncContext().getRequest().getRemoteHost()
+ ":"
+ ae.getAsyncContext().getRequest().getRemotePort()
+ " completed...");
}
@Override
public void onStartAsync(AsyncEvent ae) throws IOException {
publishToActiveClients(
ae.getAsyncContext().getRequest().getRemoteHost()
+ ":"
+ ae.getAsyncContext().getRequest().getRemotePort()
+ " started...");
}
});
activeClients.add(ac);
ac.getResponse().getWriter().flush();
publishToActiveClients(getRequestDescription(request) + " joined...");
}
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
AsyncContext asyncContext = (AsyncContext) request.getAttribute(AsyncContext.class.getName());
if (asyncContext == null) {
AsyncContext context = request.startAsync();
context.setTimeout(0);
request.setAttribute(AsyncContext.class.getName(), context);
context.addListener(this);
} else {
throw new ServletException();
}
}
@Override
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);
}
/**
* The use of {@link Asynchronous} causes this EJB method to be executed asynchronously, by a
* different thread from a dedicated, container managed thread pool.
*
* @param asyncContext the context for a suspended Servlet request that this EJB will complete
* later.
*/
@Asynchronous
public void readData(AsyncContext asyncContext) {
try {
// This is just to simulate a long running operation.
Thread.sleep(5000);
PrintWriter writer = asyncContext.getResponse().getWriter();
writer.println(new SimpleDateFormat("HH:mm:ss").format(new Date()));
writer.close();
asyncContext.complete();
} catch (Exception e) {
logger.log(Level.SEVERE, e.getMessage(), e);
}
}
@Override
public void run() {
try {
Thread.sleep(20000); // 让线程休眠2s钟模拟超时操作
PrintWriter wirter = context.getResponse().getWriter();
wirter.println("延迟输出");
System.out.println("延迟输出");
wirter.flush();
context.complete();
} catch (InterruptedException e) {
} catch (IOException e) {
}
}
@Override
public void run() {
boolean done = false;
int count = 0;
while (!Thread.currentThread().isInterrupted() && !done) {
logger.debug("Thread running...");
if (count > 10) {
done = true;
try {
sendStreamClose((HttpServletResponse) asyncContext.getResponse());
} catch (IOException e) {
e.printStackTrace();
}
continue;
}
String msg = "Sending from server the count - " + count;
try {
HttpServletResponse response = (HttpServletResponse) asyncContext.getResponse();
if (response != null) {
logger.debug("writing..." + count);
response.setContentType("text/event-stream");
PrintWriter acWriter = response.getWriter();
acWriter.write("data:" + msg + "\n\n");
acWriter.flush();
} else logger.error("response is null");
} catch (IOException ex) {
logger.error("failure in writing to response", ex);
done = true;
}
count++;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
done = true;
}
}
asyncContext.complete();
}
/* ------------------------------------------------------------ */
@Override
public void resume() {
AsyncContext context = _context;
if (context == null) throw new IllegalStateException();
_resumed = true;
_context.dispatch();
}
/* ------------------------------------------------------------ */
@Override
public void addContinuationListener(final ContinuationListener listener) {
AsyncListener wrapped =
new AsyncListener() {
@Override
public void onComplete(final AsyncEvent event) throws IOException {
listener.onComplete(Servlet3Continuation.this);
}
@Override
public void onError(AsyncEvent event) throws IOException {
listener.onComplete(Servlet3Continuation.this);
}
@Override
public void onStartAsync(AsyncEvent event) throws IOException {
event.getAsyncContext().addListener(this);
}
@Override
public void onTimeout(AsyncEvent event) throws IOException {
_expired = true;
listener.onTimeout(Servlet3Continuation.this);
}
};
if (_context != null) _context.addListener(wrapped);
else _listeners.add(wrapped);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
PrintWriter out = resp.getWriter();
logger.info(req.getDispatcherType());
out.println("success async2");
// 非法调用，此时Async的状态是DISPATCHED，complete在startAsync调用之后，dispatch之前进行调用是合法的；否则抛出IllegalState
// 此时分派尚未返回到容器，在service返回后，容器将执行complete
// asyncContext.complete();
AsyncContext asyncContext = req.startAsync();
asyncContext.start(
() -> {
System.out.println("Start!");
asyncContext.complete(); // 完成，进行响应
});
}
public void sendMessageOnChannel(
HttpServletRequest request, String message, String channel, String... excludeUsers) {
// get the application scoped model, and copy the list of subscribers,
// so that the long running task of publishing doesnt interfere with new logins
List<Subscriber> subscribersForChannel = subscriberRegistry.getSubscribersForChannel(channel);
final List<Subscriber> subscribers = new ArrayList<Subscriber>(subscribersForChannel);
String[] excludeUsersArray = excludeUsers;
if (excludeUsers == null) excludeUsersArray = new String[0];
List<String> excludeUserList = Arrays.asList(excludeUsersArray);
logger.info("Updating channel {} for {} subscribers...", channel, subscribers.size());
long start = System.currentTimeMillis();
// keep a list of failed subscribers so we can remove them at
// the end
List<Subscriber> toRemove = new ArrayList<Subscriber>();
for (Subscriber s : subscribers) {
if (excludeUserList.size() > 0 && excludeUserList.contains(s.getUser())) {
continue;
}
synchronized (s) {
AsyncContext aCtx = s.getaCtx();
try {
aCtx.getResponse().getOutputStream().print(message);
aCtx.complete();
} catch (Exception e) {
e.printStackTrace();
logger.warn(
"Failed to send to client {} - removing from list of subscribers on channel {}",
s.getUser(),
channel);
toRemove.add(s);
}
}
}
// remove the failed subscribers from the model in app scope,
// not our copy of them
subscribers.removeAll(toRemove);
// log success
long end = System.currentTimeMillis() - start;
logger.info("Finished updating channel {} in {} milliseconds.", channel, end);
}
synchronized void send(JSONStreamAware response) {
if (asyncContext == null) {
if (isInactive) {
// user not seen recently, no responses should be collected
return;
}
if (pendingResponses.size() > 1000) {
pendingResponses.clear();
// stop collecting responses for this user
isInactive = true;
if (secretPhrase == null) {
// but only completely remove users that don't have unlocked accounts
Users.remove(this);
}
return;
}
pendingResponses.offer(response);
} else {
JSONArray responses = new JSONArray();
JSONStreamAware pendingResponse;
while ((pendingResponse = pendingResponses.poll()) != null) {
responses.add(pendingResponse);
}
responses.add(response);
JSONObject combinedResponse = new JSONObject();
combinedResponse.put("responses", responses);
asyncContext.getResponse().setContentType("text/plain; charset=UTF-8");
try (Writer writer = asyncContext.getResponse().getWriter()) {
combinedResponse.writeJSONString(writer);
} catch (IOException e) {
Logger.logMessage("Error sending response to user", e);
}
asyncContext.complete();
asyncContext = null;
}
}
private synchronized void poll(
HttpServletRequest request, HttpServletResponse response, String username)
throws IOException {
Map<String, Member> room = _rooms.get(request.getPathInfo());
if (room == null) {
response.sendError(503);
return;
}
final Member member = room.get(username);
if (member == null) {
response.sendError(503);
return;
}
synchronized (member) {
if (member._queue.size() > 0) {
// Send one chat message
response.setContentType("text/json;charset=utf-8");
StringBuilder buf = new StringBuilder();
buf.append("{\"action\":\"poll\",");
buf.append("\"from\":\"");
buf.append(member._queue.poll());
buf.append("\",");
String message = member._queue.poll();
int quote = message.indexOf('"');
while (quote >= 0) {
message = message.substring(0, quote) + '\\' + message.substring(quote);
quote = message.indexOf('"', quote + 2);
}
buf.append("\"chat\":\"");
buf.append(message);
buf.append("\"}");
byte[] bytes = buf.toString().getBytes("utf-8");
response.setContentLength(bytes.length);
response.getOutputStream().write(bytes);
} else {
AsyncContext async = request.startAsync();
async.setTimeout(10000);
async.addListener(member);
if (!member._async.compareAndSet(null, async)) throw new IllegalStateException();
}
}
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
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);
}
} else {
new Exception("Async Not Supported").printStackTrace();
resp.sendError(400, "Async is not supported.");
}
}
/* (non-Javadoc)
* @see javax.servlet.http.HttpServlet#service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out = resp.getWriter();
String str1 = "进入Servlet的时间：" + new Date() + ".";
out.write(str1);
System.out.println(str1);
out.flush();
// 在子线程中执行业务调用，并由其负责输出响应，主线程退出
final AsyncContext ctx = req.startAsync();
ctx.setTimeout(200000);
new Work(ctx).start();
ctx.addListener(new AsynServletListener());
String str2 = "结束Servlet的时间：" + new Date() + ".";
out.println(str2);
out.flush();
System.out.println(str2);
}
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
final AsyncContext asyncCtx = req.startAsync(req, res);
AsyncAction asyncAction = new AsyncAction();
asyncCtx.addListener(new MyAsyncListener());
asyncCtx.start(asyncAction.f.service(asyncCtx));
}