aeron-client/src/main/java/io/aeron/logbuffer/Header.java
public final long position()
    {
        final int resultingOffset = BitUtil.align(termOffset() + frameLength(), FRAME_ALIGNMENT);
        return computePosition(termId(), resultingOffset, positionBitsToShift, initialTermId);
    }
public final long position()
    {
        final int resultingOffset = BitUtil.align(termOffset() + frameLength(), FRAME_ALIGNMENT);
        return computePosition(termId(), resultingOffset, positionBitsToShift, initialTermId);
    }
Get the current position to which the image has advanced on reading this message.

@return the current position to which the image has advanced on reading this message.