private long BlockReadingForOrderReponse(IChannelHandlerContext ctx)
{
long requestSequenceId = Interlocked.Increment(ref _dispatcherSequenceId);
if (DispatcherContext.IsResponseOrderingRequired(ctx))
{
lock (_responseMap)
{
// Limit the number of pending responses (responses which finished out of order, and are
// waiting for previous requests to be finished so they can be written in order), by
// blocking further channel reads. Due to the way Netty frame decoders work, this is more
// of an estimate than a hard limit. Netty may continue to decode and process several
// more requests that were in the latest read, even while further reads on the channel
// have been blocked.
if (requestSequenceId > Interlocked.Read(ref _lastResponseWrittenId) + _queuedResponseLimit &&
!DispatcherContext.IsChannelReadBlocked(ctx))
{
DispatcherContext.BlockChannelReads(ctx);
}
}
}
return(requestSequenceId);
}
