private IStream createStream(
SynStreamFrame frame, StreamFrameListener listener, boolean local, Promise<Stream> promise) {
IStream associatedStream = streams.get(frame.getAssociatedStreamId());
IStream stream =
new StandardStream(
frame.getStreamId(), frame.getPriority(), this, associatedStream, promise);
flowControlStrategy.onNewStream(this, stream);
stream.updateCloseState(frame.isClose(), local);
stream.setStreamFrameListener(listener);
if (stream.isUnidirectional()) {
// Unidirectional streams are implicitly half closed
stream.updateCloseState(true, !local);
if (!stream.isClosed()) stream.getAssociatedStream().associate(stream);
}
int streamId = stream.getId();
if (local) {
while (true) {
int oldStreamCountValue = localStreamCount.get();
int maxConcurrentStreams = maxConcurrentLocalStreams;
if (maxConcurrentStreams > -1 && oldStreamCountValue >= maxConcurrentStreams) {
String message =
String.format("Max concurrent local streams (%d) exceeded.", maxConcurrentStreams);
LOG.debug(message);
promise.failed(new SPDYException(message));
return null;
}
if (localStreamCount.compareAndSet(oldStreamCountValue, oldStreamCountValue + 1)) break;
}
}
if (streams.putIfAbsent(streamId, stream) != null) {
String message = "Duplicate stream id " + streamId;
IllegalStateException duplicateIdException = new IllegalStateException(message);
promise.failed(duplicateIdException);
if (local) {
localStreamCount.decrementAndGet();
throw duplicateIdException;
}
RstInfo rstInfo = new RstInfo(streamId, StreamStatus.PROTOCOL_ERROR);
LOG.debug("Duplicate stream, {}", rstInfo);
rst(rstInfo, new Callback.Adapter()); // We don't care (too much) if the reset fails.
return null;
} else {
LOG.debug("Created {}", stream);
notifyStreamCreated(stream);
return stream;
}
}
private void removeStream(IStream stream) {
if (stream.isUnidirectional()) stream.getAssociatedStream().disassociate(stream);
IStream removed = streams.remove(stream.getId());
if (removed != null) {
assert removed == stream;
if (streamIds.get() % 2 == stream.getId() % 2) localStreamCount.decrementAndGet();
LOG.debug("Removed {}", stream);
notifyStreamClosed(stream);
}
}
private void processSyn(SessionFrameListener listener, IStream stream, SynStreamFrame frame) {
stream.process(frame);
// Update the last stream id before calling the application (which may send a GO_AWAY)
updateLastStreamId(stream);
StreamFrameListener streamListener;
if (stream.isUnidirectional()) {
PushInfo pushInfo = new PushInfo(frame.getHeaders(), frame.isClose());
streamListener =
notifyOnPush(stream.getAssociatedStream().getStreamFrameListener(), stream, pushInfo);
} else {
SynInfo synInfo = new SynInfo(frame.getHeaders(), frame.isClose(), frame.getPriority());
streamListener = notifyOnSyn(listener, stream, synInfo);
}
stream.setStreamFrameListener(streamListener);
flush();
// The onSyn() listener may have sent a frame that closed the stream
if (stream.isClosed()) removeStream(stream);
}