/// <summary>
/// Get a message from FairQueuing data structure
/// </summary>
/// <param name="msg">a Msg to receive the message into</param>
/// <returns><c>true</c> if the message was received successfully, <c>false</c> if there were no messages to receive</returns>
protected override bool XRecv(ref Msg msg)
{
bool received = m_fairQueueing.Recv(ref msg);
// Drop any messages with more flag
while (received && msg.HasMore)
{
// drop all frames of the current multi-frame message
received = m_fairQueueing.Recv(ref msg);
while (received && msg.HasMore)
{
received = m_fairQueueing.Recv(ref msg);
}
// get the new message
if (received)
{
received = m_fairQueueing.Recv(ref msg);
}
}
if (!received)
{
return(false);
}
return(true);
}
/// <summary>
/// Receive a message. The <c>Recv</c> method calls this lower-level method to do the actual receiving.
/// </summary>
/// <param name="msg">the <c>Msg</c> to receive the message into</param>
/// <returns><c>true</c> if the message was received successfully, <c>false</c> if there were no messages to receive</returns>
protected override bool XRecv(ref Msg msg)
{
bool received = m_fairQueueing.RecvPipe(ref msg, out var pipe);
// Drop any messages with more flag
while (received && msg.HasMore)
{
// drop all frames of the current multi-frame message
received = m_fairQueueing.Recv(ref msg);
while (received && msg.HasMore)
{
received = m_fairQueueing.Recv(ref msg);
}
// get the new message
if (received)
{
received = m_fairQueueing.RecvPipe(ref msg, out pipe);
}
}
if (!received)
{
return(false);
}
Assumes.NotNull(pipe);
msg.RoutingId = pipe.RoutingId;
return(true);
}
/// <summary>
/// If there's a pre-fetched message, snatch that.
/// Otherwise, dump any identity messages and get the first non-identity message,
/// or return false if there are no messages available.
/// </summary>
/// <param name="msg">a Msg to receive the message into</param>
/// <returns>false if there were no messages to receive</returns>
private bool ReceiveInternal(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_fairQueueing.Recv(ref msg);
if (!isMessageAvailable)
{
return(false);
}
// Stop when we get any message that is not an Identity.
if (!msg.IsIdentity)
{
break;
}
}
return(true);
}
private bool ReceiveInternal(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_fairQueueing.Recv(ref msg);
if (!isMessageAvailable)
{
return(false);
}
if ((msg.Flags & MsgFlags.Identity) == 0)
{
break;
}
}
return(true);
}
/// <summary>
/// Receive a message. The <c>Recv</c> method calls this lower-level method to do the actual receiving.
/// </summary>
/// <param name="msg">the <c>Msg</c> to receive the message into</param>
/// <returns><c>true</c> if the message was received successfully, <c>false</c> if there were no messages to receive</returns>
protected override bool XRecv(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_moreIn = 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_fairQueueing.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_moreIn || !m_options.Filter || Match(msg))
{
m_moreIn = msg.HasMore;
return(true);
}
// Message doesn't match. Pop any remaining parts of the message
// from the pipe.
while (msg.HasMore)
{
isMessageAvailable = m_fairQueueing.Recv(ref msg);
Debug.Assert(isMessageAvailable);
}
}
}
protected override bool XRecv(SendReceiveOptions flags, ref Msg msg)
{
return(m_fairQueueing.Recv(ref msg));
}
/// <summary>
/// Receive a message. The <c>Recv</c> method calls this lower-level method to do the actual receiving.
/// </summary>
/// <param name="msg">the <c>Msg</c> to receive the message into</param>
/// <returns><c>true</c> if the message was received successfully, <c>false</c> if there were no messages to receive</returns>
protected override bool XRecv(ref Msg msg)
{
return(m_fairQueueing.Recv(ref msg));
}
