aeron-client/src/main/java/io/aeron/logbuffer/LogBufferUnblocker.java
public static boolean unblock(
        final UnsafeBuffer[] termBuffers,
        final UnsafeBuffer logMetaDataBuffer,
        final long blockedPosition,
        final int termLength)
    {
        final int positionBitsToShift = LogBufferDescriptor.positionBitsToShift(termLength);
        final int blockedTermCount = (int)(blockedPosition >> positionBitsToShift);
        final int blockedOffset = (int)blockedPosition & (termLength - 1);
        final int activeTermCount = activeTermCount(logMetaDataBuffer);

        if (activeTermCount == (blockedTermCount - 1) && blockedOffset == 0)
        {
            final int currentTermId = termId(rawTailVolatile(logMetaDataBuffer, indexByTermCount(activeTermCount)));
            return rotateLog(logMetaDataBuffer, activeTermCount, currentTermId);
        }

        final int blockedIndex = indexByTermCount(blockedTermCount);
        final long rawTail = rawTailVolatile(logMetaDataBuffer, blockedIndex);
        final int termId = termId(rawTail);
        final int tailOffset = termOffset(rawTail, termLength);
        final UnsafeBuffer termBuffer = termBuffers[blockedIndex];

        switch (TermUnblocker.unblock(logMetaDataBuffer, termBuffer, blockedOffset, tailOffset, termId))
        {
            case UNBLOCKED_TO_END:
                rotateLog(logMetaDataBuffer, blockedTermCount, termId);
                // fall through
            case UNBLOCKED:
                return true;
        }

        return false;
    }
public static boolean unblock(
        final UnsafeBuffer[] termBuffers,
        final UnsafeBuffer logMetaDataBuffer,
        final long blockedPosition,
        final int termLength)
    {
        final int positionBitsToShift = LogBufferDescriptor.positionBitsToShift(termLength);
        final int blockedTermCount = (int)(blockedPosition >> positionBitsToShift);
        final int blockedOffset = (int)blockedPosition & (termLength - 1);
        final int activeTermCount = activeTermCount(logMetaDataBuffer);

        if (activeTermCount == (blockedTermCount - 1) && blockedOffset == 0)
        {
            final int currentTermId = termId(rawTailVolatile(logMetaDataBuffer, indexByTermCount(activeTermCount)));
            return rotateLog(logMetaDataBuffer, activeTermCount, currentTermId);
        }

        final int blockedIndex = indexByTermCount(blockedTermCount);
        final long rawTail = rawTailVolatile(logMetaDataBuffer, blockedIndex);
        final int termId = termId(rawTail);
        final int tailOffset = termOffset(rawTail, termLength);
        final UnsafeBuffer termBuffer = termBuffers[blockedIndex];

        switch (TermUnblocker.unblock(logMetaDataBuffer, termBuffer, blockedOffset, tailOffset, termId))
        {
            case UNBLOCKED_TO_END:
                rotateLog(logMetaDataBuffer, blockedTermCount, termId);
                // fall through
            case UNBLOCKED:
                return true;
        }

        return false;
    }
Attempt to unblock a log buffer at given position

@param termBuffers       for current blockedOffset
@param logMetaDataBuffer for log buffer
@param blockedPosition   to attempt to unblock
@param termLength        of the buffer for each term in the log
@return whether unblocked or not