/// <inheritdoc />
public override long TryClaim(int length, BufferClaim bufferClaim)
{
CheckPayloadLength(length);
long newPosition = CLOSED;
if (!_isClosed)
{
long limit = _positionLimit.GetVolatile();
int termCount = LogBufferDescriptor.ActiveTermCount(_logMetaDataBuffer);
TermAppender termAppender = _termAppenders[LogBufferDescriptor.IndexByTermCount(termCount)];
long rawTail = termAppender.RawTailVolatile();
long termOffset = rawTail & 0xFFFF_FFFFL;
int termId = LogBufferDescriptor.TermId(rawTail);
long position = LogBufferDescriptor.ComputeTermBeginPosition(termId, PositionBitsToShift, InitialTermId) + termOffset;
if (termCount != (termId - InitialTermId))
{
return(ADMIN_ACTION);
}
if (position < limit)
{
int resultingOffset = termAppender.Claim(_headerWriter, length, bufferClaim, termId);
newPosition = NewPosition(termCount, (int)termOffset, termId, position, resultingOffset);
}
else
{
newPosition = BackPressureStatus(position, length);
}
}
return(newPosition);
}
/// <inheritdoc />
public override long Offer(IDirectBuffer buffer, int offset, int length, ReservedValueSupplier reservedValueSupplier = null)
{
long newPosition = CLOSED;
if (!_isClosed)
{
long limit = _positionLimit.GetVolatile();
int termCount = LogBufferDescriptor.ActiveTermCount(_logMetaDataBuffer);
TermAppender termAppender = _termAppenders[LogBufferDescriptor.IndexByTermCount(termCount)];
long rawTail = termAppender.RawTailVolatile();
long termOffset = rawTail & 0xFFFF_FFFFL;
int termId = LogBufferDescriptor.TermId(rawTail);
long position = LogBufferDescriptor.ComputeTermBeginPosition(termId, PositionBitsToShift, InitialTermId) + termOffset;
if (termCount != (termId - InitialTermId))
{
return(ADMIN_ACTION);
}
if (position < limit)
{
int resultingOffset;
if (length <= MaxPayloadLength)
{
CheckPositiveLength(length);
resultingOffset = termAppender.AppendUnfragmentedMessage(
_headerWriter,
buffer,
offset,
length,
reservedValueSupplier,
termId);
}
else
{
CheckMaxMessageLength(length);
resultingOffset = termAppender.AppendFragmentedMessage(
_headerWriter,
buffer,
offset,
length,
MaxPayloadLength,
reservedValueSupplier,
termId);
}
newPosition = NewPosition(termCount, (int)termOffset, termId, position, resultingOffset);
}
else
{
newPosition = BackPressureStatus(position, length);
}
}
return(newPosition);
}
