/// <summary>
/// expect packet from transport.<para/>
/// the transport must be a TcpServer or NetbiosServer.
/// </summary>
/// <param name="host">
/// an IVisitorGetAnyPacket interface that specifies the host of visitor.
/// </param>
/// <param name="eventQueue">
/// a SyncFilterQueue<TransportEvent> that specifies the queue to store event.
/// </param>
/// <param name="sequence">
/// a DataSequence object that manages the sequence information of multiple clients.
/// </param>
/// <param name="timeout">
/// a TimeSpan object that indicates the timeout to expect event.
/// </param>
/// <param name="skipEvent">
/// a bool value that specifies whether skip the event.<para/>
/// if true, just wait for packet coming; otherwise, both data and event will return.
/// </param>
/// <returns>
/// a StackPacket object that specifies the received packet.<para/>
/// if all buffer is closed in this while, and required to return if all buffer is closed, return null.<para/>
/// otherwise never return null, if no packets coming in timespan, throw exception.
/// </returns>
public static TransportEvent Visit(
IVisitorGetAnyData host,
SyncFilterQueue<TransportEvent> eventQueue, DataSequence sequence, TimeSpan timeout, bool skipEvent)
{
// the end time for operation.
DateTime endTime = DateTime.Now + timeout;
TimeSpan currentTimeout = timeout;
while (true)
{
sequence.Reset();
// try to decode packet from all clients in sequence.
while (true)
{
SequenceItem item = sequence.Next(TimeSpan.MinValue);
// all item in the sequences returned
if (item == null)
{
break;
}
TransportEvent transportEvent = item.Source as TransportEvent;
// if event arrived and donot skip the event, return the event directly.
if (transportEvent != null)
{
if (skipEvent)
{
continue;
}
sequence.Remove(transportEvent);
Utility.Remove(eventQueue, transportEvent);
return transportEvent;
}
object remoteEndPoint;
object localEndPoint;
host.VisitorGetEndPoint(item.Source, out remoteEndPoint, out localEndPoint);
int consumedLength = 0;
StackPacket packet = null;
try
{
// set timeout to zero, must not wait for more data.
// if timeout, process next.
packet = host.VisitorDecodePackets(
item.Source, remoteEndPoint, localEndPoint, out consumedLength);
// remove the sequence information in data sequence.
sequence.Consume(item.Source, consumedLength);
if (packet != null)
{
TcpServerConnection connection = item.Source as TcpServerConnection;
if (connection != null)
{
return connection.VisitorCreateTransportEvent(EventType.ReceivedPacket, packet);
}
else
{
return new TransportEvent(EventType.ReceivedPacket, remoteEndPoint, localEndPoint, packet);
}
}
}
// skip timeout of any host.
catch (TimeoutException)
{
}
}
// waiting for next data coming.
sequence.Next(currentTimeout);
currentTimeout = endTime - DateTime.Now;
}
}
/// <summary>
/// expect packet from transport.<para/>
/// the transport must be a TcpServer or NetbiosServer.
/// </summary>
/// <param name="host">
/// an IVisitorGetAnyPacket interface that specifies the host of visitor.
/// </param>
/// <param name="eventQueue">
/// a SyncFilterQueue<TransportEvent> that specifies the queue to store event.
/// </param>
/// <param name="sequence">
/// a DataSequence object that manages the sequence information of multiple clients.
/// </param>
/// <param name="timeout">
/// a TimeSpan object that indicates the timeout to expect event.
/// </param>
/// <param name="skipEvent">
/// a bool value that specifies whether skip the event.<para/>
/// if true, just wait for packet coming; otherwise, both data and event will return.
/// </param>
/// <returns>
/// a StackPacket object that specifies the received packet.<para/>
/// if all buffer is closed in this while, and required to return if all buffer is closed, return null.<para/>
/// otherwise never return null, if no packets coming in timespan, throw exception.
/// </returns>
public static TransportEvent Visit(
IVisitorGetAnyData host,
SyncFilterQueue <TransportEvent> eventQueue, DataSequence sequence, TimeSpan timeout, bool skipEvent)
{
// the end time for operation.
DateTime endTime = DateTime.Now + timeout;
TimeSpan currentTimeout = timeout;
while (true)
{
sequence.Reset();
// try to decode packet from all clients in sequence.
while (true)
{
SequenceItem item = sequence.Next(TimeSpan.MinValue);
// all item in the sequences returned
if (item == null)
{
break;
}
TransportEvent transportEvent = item.Source as TransportEvent;
// if event arrived and donot skip the event, return the event directly.
if (transportEvent != null)
{
if (skipEvent)
{
continue;
}
sequence.Remove(transportEvent);
Utility.Remove(eventQueue, transportEvent);
return(transportEvent);
}
object remoteEndPoint;
object localEndPoint;
host.VisitorGetEndPoint(item.Source, out remoteEndPoint, out localEndPoint);
int consumedLength = 0;
StackPacket packet = null;
try
{
// set timeout to zero, must not wait for more data.
// if timeout, process next.
packet = host.VisitorDecodePackets(
item.Source, remoteEndPoint, localEndPoint, out consumedLength);
// remove the sequence information in data sequence.
sequence.Consume(item.Source, consumedLength);
if (packet != null)
{
TcpServerConnection connection = item.Source as TcpServerConnection;
if (connection != null)
{
return(connection.VisitorCreateTransportEvent(EventType.ReceivedPacket, packet));
}
else
{
return(new TransportEvent(EventType.ReceivedPacket, remoteEndPoint, localEndPoint, packet));
}
}
}
// skip timeout of any host.
catch (TimeoutException)
{
}
}
// waiting for next data coming.
sequence.Next(currentTimeout);
currentTimeout = endTime - DateTime.Now;
}
}
