/// <summary>
/// Attempt to unblock a log buffer at given position
/// </summary>
/// <param name="logPartitions"> for current blockedOffset </param>
/// <param name="logMetaDataBuffer"> for log buffer </param>
/// <param name="blockedPosition"> to attempt to unblock </param>
/// <returns> whether unblocked or not </returns>
public static bool Unblock(LogBufferPartition[] logPartitions, DirectBuffer logMetaDataBuffer, long blockedPosition)
{
checked {
int termLength = (int)logPartitions[0].TermBuffer.Length;
int positionBitsToShift = BitUtil.NumberOfTrailingZeros(termLength);
int activeIndex = LogBufferDescriptor.IndexByPosition(blockedPosition, positionBitsToShift);
LogBufferPartition activePartition = logPartitions[activeIndex];
DirectBuffer termBuffer = activePartition.TermBuffer;
long rawTail = activePartition.RawTailVolatile;
int termId = LogBufferDescriptor.TermId(rawTail);
int tailOffset = LogBufferDescriptor.TermOffset(rawTail, termLength);
int blockedOffset = LogBufferDescriptor.ComputeTermOffsetFromPosition(blockedPosition, positionBitsToShift);
bool result = false;
switch (TermUnblocker.Unblock(logMetaDataBuffer, termBuffer, blockedOffset, tailOffset, termId))
{
case TermUnblockerStatus.UNBLOCKED_TO_END:
LogBufferDescriptor.RotateLog(logPartitions, logMetaDataBuffer, activeIndex, termId + 1);
// fall through
goto case TermUnblockerStatus.UNBLOCKED;
case TermUnblockerStatus.UNBLOCKED:
result = true;
break;
}
return(result);
}
}
public TermAppender(LogBufferPartition partition)
{
this._termBuffer = partition.TermBuffer;
this._metaDataBuffer = partition.MetaDataBuffer;
}