Example usage for javax.servlet AsyncContext start

Introduction

In this page you can find the example usage for javax.servlet AsyncContext start.

Prototype

public void start(Runnable run);

Source Link

Document

Causes the container to dispatch a thread, possibly from a managed thread pool, to run the specified Runnable.

Usage

From source file:eu.rethink.lhcb.broker.servlet.WellKnownServlet.java

private void handleRequest(HttpServletRequest req, final HttpServletResponse resp)
        throws ServletException, IOException {

    // add header for cross domain stuff
    resp.addHeader("Access-Control-Allow-Origin", "*");
    String host = req.getHeader("X-Forwarded-Host");
    if (host == null)
        host = req.getHeader("Host");

    // setting external host here helps BrokerWebSocketListener to return info about HTTP interface
    // Broker might not know how it is accessible. This is a workaround for it
    LHCBBroker.externalHost = host;//from  www.j a  va  2  s.co m
    final AsyncContext asyncContext = req.startAsync();
    asyncContext.start(() -> {
        ServletRequest aReq = asyncContext.getRequest();
        String payload = null;
        try {
            payload = IOUtils.toString(aReq.getReader());
        } catch (IOException e) {
            e.printStackTrace();
        }

        String finalPayload = payload;

        Map<String, String[]> params = aReq.getParameterMap();
        LOG.debug("payload: {}\r\nparams: {}", payload, params);

        RequestCallback cb = new RequestCallback() {

            @Override
            public void response(Message msg) {
                resp.setStatus(HttpServletResponse.SC_OK);
                try {
                    asyncContext.getResponse().getWriter().write(msg.toString());
                    asyncContext.getResponse().getWriter().flush();
                    asyncContext.complete();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void error(Exception e) {
                String error = "Request failed.\r\npayload: " + finalPayload + "\r\nparams: " + params;
                LOG.error(error + "\r\nreason: " + e.getLocalizedMessage(),
                        e instanceof InvalidMessageException ? null : e);
                if (e instanceof InvalidMessageException) {
                    resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
                } else {
                    resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

                }
                completeAsyncContext(asyncContext, error + "\r\nreason: " + e.getLocalizedMessage());
            }
        };

        try {
            Message msg = null;

            if (payload.length() > 0) {
                msg = Message.fromString(payload);
            } else {
                msg = Message.fromParams(params);
            }

            requestHandler.handleRequest(msg, cb);
        } catch (InvalidMessageException e) {
            cb.error(e);
        }
    });
}

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From source file:com.ifactory.service.weather.photo.PhotoServlet.java

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.setContentType("application/json");
    final AsyncContext aCtx = req.startAsync(req, resp);
    aCtx.start(new PostPhotoService(aCtx, this.photo));
}

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From source file:com.ifactory.service.weather.photo.PhotoServlet.java

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
    resp.setContentType("application/json");
    final AsyncContext aCtx = req.startAsync(req, resp);
    aCtx.start(new GetPhotoService(aCtx, this.photo));
}

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