private bool xxrecv(SendReceiveOptions flags, ref Msg msg)
{
// If there is a prefetched message, return it.
if (m_prefetched)
{
msg.Move(ref m_prefetchedMsg);
m_prefetched = false;
return(true);
}
// DEALER socket doesn't use identities. We can safely drop it and
while (true)
{
bool isMessageAvailable = m_fq.Recv(ref msg);
if (!isMessageAvailable)
{
return(false);
}
if ((msg.Flags & MsgFlags.Identity) == 0)
{
break;
}
}
return(true);
}
protected override bool XRecv(SendReceiveOptions flags, ref Msg msg)
{
if (m_prefetched)
{
if (!m_identitySent)
{
msg.Move(ref m_prefetchedId);
m_identitySent = true;
}
else
{
msg.Move(ref m_prefetchedMsg);
m_prefetched = false;
}
return(true);
}
Pipe[] pipe = new Pipe[1];
bool isMessageAvailable = m_fq.RecvPipe(pipe, ref m_prefetchedMsg);
if (!isMessageAvailable)
{
return(false);
}
Debug.Assert(pipe[0] != null);
Debug.Assert(!m_prefetchedMsg.HasMore);
// We have received a frame with TCP data.
// Rather than sendig this frame, we keep it in prefetched
// buffer and send a frame with peer's ID.
Blob identity = pipe[0].Identity;
msg.InitPool(identity.Size);
msg.Put(identity.Data, 0, identity.Size);
msg.SetFlags(MsgFlags.More);
m_prefetched = true;
m_identitySent = true;
return(true);
}
protected override bool XRecv(SendReceiveOptions flags, ref Msg msg)
{
// If there's already a message prepared by a previous call to zmq_poll,
// return it straight ahead.
if (m_hasMessage)
{
msg.Move(ref m_message);
m_hasMessage = false;
m_more = msg.HasMore;
return(true);
}
// TODO: This can result in infinite loop in the case of continuous
// stream of non-matching messages which breaks the non-blocking recv
// semantics.
while (true)
{
// Get a message using fair queueing algorithm.
bool isMessageAvailable = m_fq.Recv(ref msg);
// If there's no message available, return immediately.
// The same when error occurs.
if (!isMessageAvailable)
{
return(false);
}
// Check whether the message matches at least one subscription.
// Non-initial parts of the message are passed
if (m_more || !m_options.Filter || Match(msg))
{
m_more = msg.HasMore;
return(true);
}
// Message doesn't match. Pop any remaining parts of the message
// from the pipe.
while (msg.HasMore)
{
isMessageAvailable = m_fq.Recv(ref msg);
Debug.Assert(isMessageAvailable);
}
}
}
protected override bool XRecv(SendReceiveOptions flags, ref Msg msg)
{
if (m_prefetched)
{
if (!m_identitySent)
{
msg.Move(ref m_prefetchedId);
m_identitySent = true;
}
else
{
msg.Move(ref m_prefetchedMsg);
m_prefetched = false;
}
m_moreIn = msg.HasMore;
return(true);
}
Pipe[] pipe = new Pipe[1];
bool isMessageAvailable = m_fq.RecvPipe(pipe, ref msg);
// It's possible that we receive peer's identity. That happens
// after reconnection. The current implementation assumes that
// the peer always uses the same identity.
// TODO: handle the situation when the peer changes its identity.
while (isMessageAvailable && msg.IsIdentity)
{
isMessageAvailable = m_fq.RecvPipe(pipe, ref msg);
}
if (!isMessageAvailable)
{
return(false);
}
Debug.Assert(pipe[0] != null);
// If we are in the middle of reading a message, just return the next part.
if (m_moreIn)
{
m_moreIn = msg.HasMore;
}
else
{
// We are at the beginning of a message.
// Keep the message part we have in the prefetch buffer
// and return the ID of the peer instead.
m_prefetchedMsg.Move(ref msg);
m_prefetched = true;
Blob identity = pipe[0].Identity;
msg.InitPool(identity.Size);
msg.Put(identity.Data, 0, identity.Size);
msg.SetFlags(MsgFlags.More);
m_identitySent = true;
}
return(true);
}
