internal Publication(ClientConductor clientConductor, string channel, int streamId, int sessionId, IReadablePosition positionLimit, LogBuffers logBuffers, long registrationId)
{
var buffers = logBuffers.TermBuffers();
var logMetaDataBuffer = logBuffers.MetaDataBuffer();
for (var i = 0; i < LogBufferDescriptor.PARTITION_COUNT; i++)
{
_termAppenders[i] = new TermAppender(buffers[i], logMetaDataBuffer, i);
}
var termLength = logBuffers.TermLength();
MaxPayloadLength = LogBufferDescriptor.MtuLength(logMetaDataBuffer) - DataHeaderFlyweight.HEADER_LENGTH;
MaxMessageLength = FrameDescriptor.ComputeMaxMessageLength(termLength);
_conductor = clientConductor;
Channel = channel;
StreamId = streamId;
SessionId = sessionId;
InitialTermId = LogBufferDescriptor.InitialTermId(logMetaDataBuffer);
_logMetaDataBuffer = logMetaDataBuffer;
RegistrationId = registrationId;
_positionLimit = positionLimit;
_logBuffers = logBuffers;
_positionBitsToShift = IntUtil.NumberOfTrailingZeros(termLength);
_headerWriter = new HeaderWriter(LogBufferDescriptor.DefaultFrameHeader(logMetaDataBuffer));
}
internal Publication(
ClientConductor clientConductor,
string channel,
int streamId,
int sessionId,
IReadablePosition positionLimit,
int channelStatusId,
LogBuffers logBuffers,
long originalRegistrationId,
long registrationId)
{
_logMetaDataBuffer = logBuffers.MetaDataBuffer();
TermBufferLength = logBuffers.TermLength();
MaxMessageLength = FrameDescriptor.ComputeMaxMessageLength(TermBufferLength);
MaxPayloadLength = LogBufferDescriptor.MtuLength(_logMetaDataBuffer) - DataHeaderFlyweight.HEADER_LENGTH;
_maxPossiblePosition = TermBufferLength * (1L << 31);
_conductor = clientConductor;
Channel = channel;
StreamId = streamId;
SessionId = sessionId;
InitialTermId = LogBufferDescriptor.InitialTermId(_logMetaDataBuffer);
_originalRegistrationId = originalRegistrationId;
RegistrationId = registrationId;
_positionLimit = positionLimit;
_channelStatusId = channelStatusId;
_logBuffers = logBuffers;
PositionBitsToShift = LogBufferDescriptor.PositionBitsToShift(TermBufferLength);
_headerWriter = new HeaderWriter(LogBufferDescriptor.DefaultFrameHeader(_logMetaDataBuffer));
}
/// <summary>
/// Count of observed active transports within the image liveness timeout.
///
/// If the image is closed, then this is 0. This may also be 0 if no actual datagrams have arrived. IPC
/// Images also will be 0.
/// </summary>
/// <returns> count of active transports - 0 if Image is closed, no datagrams yet, or IPC. </returns>
public int ActiveTransportCount()
{
if (_isClosed)
{
return(0);
}
return(LogBufferDescriptor.ActiveTransportCount(_logBuffers.MetaDataBuffer()));
}
/// <summary>
/// Construct a new image over a log to represent a stream of messages from a <seealso cref="Publication"/>.
/// </summary>
/// <param name="subscription"> to which this <seealso cref="Image"/> belongs. </param>
/// <param name="sessionId"> of the stream of messages. </param>
/// <param name="subscriberPosition"> for indicating the position of the subscriber in the stream. </param>
/// <param name="logBuffers"> containing the stream of messages. </param>
/// <param name="errorHandler"> to be called if an error occurs when polling for messages. </param>
/// <param name="sourceIdentity"> of the source sending the stream of messages. </param>
/// <param name="correlationId"> of the request to the media driver. </param>
public Image(Subscription subscription, int sessionId, IPosition subscriberPosition, LogBuffers logBuffers, ErrorHandler errorHandler, string sourceIdentity, long correlationId)
{
Subscription = subscription;
SessionId = sessionId;
_subscriberPosition = subscriberPosition;
_logBuffers = logBuffers;
_errorHandler = errorHandler;
SourceIdentity = sourceIdentity;
CorrelationId = correlationId;
_joiningPosition = subscriberPosition.Get();
_termBuffers = logBuffers.TermBuffers();
var termLength = logBuffers.TermLength();
_termLengthMask = termLength - 1;
_positionBitsToShift = IntUtil.NumberOfTrailingZeros(termLength);
_initialTermId = LogBufferDescriptor.InitialTermId(logBuffers.MetaDataBuffer());
_header = new Header(LogBufferDescriptor.InitialTermId(logBuffers.MetaDataBuffer()), _positionBitsToShift, this);
}
internal ExclusivePublication(
ClientConductor clientConductor,
string channel,
int streamId,
int sessionId,
IReadablePosition positionLimit,
LogBuffers logBuffers,
long originalRegistrationId,
long registrationId)
{
var buffers = logBuffers.TermBuffers();
var logMetaDataBuffer = logBuffers.MetaDataBuffer();
for (var i = 0; i < LogBufferDescriptor.PARTITION_COUNT; i++)
{
_termAppenders[i] = new ExclusiveTermAppender(buffers[i], logMetaDataBuffer, i);
}
var termLength = logBuffers.TermLength();
_termBufferLength = termLength;
MaxPayloadLength = LogBufferDescriptor.MtuLength(logMetaDataBuffer) - DataHeaderFlyweight.HEADER_LENGTH;
MaxMessageLength = FrameDescriptor.ComputeExclusiveMaxMessageLength(termLength);
_maxPossiblePosition = termLength * (1L << 31);
_conductor = clientConductor;
Channel = channel;
StreamId = streamId;
SessionId = sessionId;
_logMetaDataBuffer = logMetaDataBuffer;
_originalRegistrationId = originalRegistrationId;
RegistrationId = registrationId;
_positionLimit = positionLimit;
_logBuffers = logBuffers;
_positionBitsToShift = IntUtil.NumberOfTrailingZeros(termLength);
_headerWriter = new HeaderWriter(LogBufferDescriptor.DefaultFrameHeader(logMetaDataBuffer));
InitialTermId = LogBufferDescriptor.InitialTermId(logMetaDataBuffer);
var activeIndex = LogBufferDescriptor.ActivePartitionIndex(logMetaDataBuffer);
_activePartitionIndex = activeIndex;
long rawTail = LogBufferDescriptor.RawTail(_logMetaDataBuffer, activeIndex);
_termId = LogBufferDescriptor.TermId(rawTail);
_termOffset = LogBufferDescriptor.TermOffset(rawTail, termLength);
_termBeginPosition =
LogBufferDescriptor.ComputeTermBeginPosition(_termId, _positionBitsToShift, InitialTermId);
}
internal ExclusivePublication(
ClientConductor clientConductor,
string channel,
int streamId,
int sessionId,
IReadablePosition positionLimit,
int channelStatusId,
LogBuffers logBuffers,
long originalRegistrationId,
long registrationId)
: base(
clientConductor,
channel,
streamId,
sessionId,
positionLimit,
channelStatusId,
logBuffers,
originalRegistrationId,
registrationId,
FrameDescriptor.ComputeExclusiveMaxMessageLength(logBuffers.TermLength())
)
{
var buffers = logBuffers.DuplicateTermBuffers();
var logMetaDataBuffer = logBuffers.MetaDataBuffer();
for (var i = 0; i < LogBufferDescriptor.PARTITION_COUNT; i++)
{
_termAppenders[i] = new ExclusiveTermAppender(buffers[i], logMetaDataBuffer, i);
}
var termCount = LogBufferDescriptor.ActiveTermCount(logMetaDataBuffer);
var index = LogBufferDescriptor.IndexByTermCount(termCount);
_activePartitionIndex = index;
var rawTail = LogBufferDescriptor.RawTail(_logMetaDataBuffer, index);
_termId = LogBufferDescriptor.TermId(rawTail);
_termOffset = LogBufferDescriptor.TermOffset(rawTail);
_termBeginPosition =
LogBufferDescriptor.ComputeTermBeginPosition(_termId, _positionBitsToShift, InitialTermId);
}
/// <summary>
/// The length in bytes of the MTU (Maximum Transmission Unit) the Sender used for the datagram.
/// </summary>
/// <returns> length in bytes of the MTU (Maximum Transmission Unit) the Sender used for the datagram. </returns>
public int MtuLength()
{
return(LogBufferDescriptor.MtuLength(_logBuffers.MetaDataBuffer()));
}
internal void Close()
{
_finalPosition = _subscriberPosition.GetVolatile();
_isEos = _finalPosition >= LogBufferDescriptor.EndOfStreamPosition(_logBuffers.MetaDataBuffer());
_isClosed = true;
}