@Override
protected void flushCache() throws SockJsTransportFailureException {
while (!getMessageCache().isEmpty()) {
String message = getMessageCache().poll();
SockJsMessageCodec messageCodec = getSockJsServiceConfig().getMessageCodec();
SockJsFrame frame = SockJsFrame.messageFrame(messageCodec, message);
writeFrame(frame);
this.byteCount += frame.getContentBytes().length + 1;
if (logger.isTraceEnabled()) {
logger.trace(
this.byteCount
+ " bytes written so far, "
+ getMessageCache().size()
+ " more messages not flushed");
}
if (this.byteCount >= getSockJsServiceConfig().getStreamBytesLimit()) {
if (logger.isTraceEnabled()) {
logger.trace("Streamed bytes limit reached. Recycling current request");
}
resetRequest();
this.byteCount = 0;
break;
}
}
scheduleHeartbeat();
}
/**
* Handle the first request for receiving messages on a SockJS HTTP transport based session.
*
* <p>Long polling-based transports (e.g. "xhr", "jsonp") complete the request after writing the
* open frame. Streaming-based transports ("xhr_streaming", "eventsource", and "htmlfile") leave
* the response open longer for further streaming of message frames but will also close it
* eventually after some amount of data has been sent.
*
* @param request the current request
* @param response the current response
* @param frameFormat the transport-specific SocksJS frame format to use
*/
public void handleInitialRequest(
ServerHttpRequest request, ServerHttpResponse response, SockJsFrameFormat frameFormat)
throws SockJsException {
this.uri = request.getURI();
this.handshakeHeaders = request.getHeaders();
this.principal = request.getPrincipal();
this.localAddress = request.getLocalAddress();
this.remoteAddress = request.getRemoteAddress();
this.response = response;
this.frameFormat = frameFormat;
this.asyncRequestControl = request.getAsyncRequestControl(response);
synchronized (this.responseLock) {
try {
// Let "our" handler know before sending the open frame to the remote handler
delegateConnectionEstablished();
writePrelude(request, response);
writeFrame(SockJsFrame.openFrame());
if (isStreaming() && !isClosed()) {
startAsyncRequest();
}
} catch (Throwable ex) {
tryCloseWithSockJsTransportError(ex, CloseStatus.SERVER_ERROR);
throw new SockJsTransportFailureException("Failed to open session", getId(), ex);
}
}
}
protected void handleRequestInternal(
ServerHttpRequest request,
ServerHttpResponse response,
AbstractHttpSockJsSession sockJsSession)
throws SockJsException {
if (sockJsSession.isNew()) {
if (logger.isDebugEnabled()) {
logger.debug(request.getMethod() + " " + request.getURI());
}
sockJsSession.handleInitialRequest(request, response, getFrameFormat(request));
} else if (sockJsSession.isClosed()) {
if (logger.isDebugEnabled()) {
logger.debug("Connection already closed (but not removed yet) for " + sockJsSession);
}
SockJsFrame frame = SockJsFrame.closeFrameGoAway();
try {
response.getBody().write(frame.getContentBytes());
} catch (IOException ex) {
throw new SockJsException("Failed to send " + frame, sockJsSession.getId(), ex);
}
} else if (!sockJsSession.isActive()) {
if (logger.isTraceEnabled()) {
logger.trace("Starting " + getTransportType() + " async request.");
}
sockJsSession.handleSuccessiveRequest(request, response, getFrameFormat(request));
} else {
if (logger.isDebugEnabled()) {
logger.debug(
"Another " + getTransportType() + " connection still open for " + sockJsSession);
}
String formattedFrame =
getFrameFormat(request).format(SockJsFrame.closeFrameAnotherConnectionOpen());
try {
response.getBody().write(formattedFrame.getBytes(SockJsFrame.CHARSET));
} catch (IOException ex) {
throw new SockJsException("Failed to send " + formattedFrame, sockJsSession.getId(), ex);
}
}
}
@Override
protected void handleRequestInternal(
ServerHttpRequest request, ServerHttpResponse response, boolean initialRequest)
throws IOException {
byte[] prelude = getPrelude(request);
Assert.notNull(prelude);
response.getBody().write(prelude);
response.flush();
if (initialRequest) {
writeFrame(SockJsFrame.openFrame());
}
flushCache();
}
/**
* Handle all requests, except the first one, to receive messages on a SockJS HTTP transport based
* session.
*
* <p>Long polling-based transports (e.g. "xhr", "jsonp") complete the request after writing any
* buffered message frames (or the next one). Streaming-based transports ("xhr_streaming",
* "eventsource", and "htmlfile") leave the response open longer for further streaming of message
* frames but will also close it eventually after some amount of data has been sent.
*
* @param request the current request
* @param response the current response
* @param frameFormat the transport-specific SocksJS frame format to use
*/
public void handleSuccessiveRequest(
ServerHttpRequest request, ServerHttpResponse response, SockJsFrameFormat frameFormat)
throws SockJsException {
synchronized (this.responseLock) {
try {
if (isClosed()) {
response.getBody().write(SockJsFrame.closeFrameGoAway().getContentBytes());
}
this.response = response;
this.frameFormat = frameFormat;
this.asyncRequestControl = request.getAsyncRequestControl(response);
writePrelude(request, response);
startAsyncRequest();
} catch (Throwable ex) {
tryCloseWithSockJsTransportError(ex, CloseStatus.SERVER_ERROR);
throw new SockJsTransportFailureException(
"Failed to handle SockJS receive request", getId(), ex);
}
}
}