/**
* Called from the {@link DriverConductor}.
*
* @param now in nanoseconds
* @param statusMessageTimeout for sending of Status Messages.
*/
void trackRebuild(final long now, final long statusMessageTimeout) {
long minSubscriberPosition = Long.MAX_VALUE;
long maxSubscriberPosition = Long.MIN_VALUE;
for (final ReadablePosition subscriberPosition : subscriberPositions) {
final long position = subscriberPosition.getVolatile();
minSubscriberPosition = Math.min(minSubscriberPosition, position);
maxSubscriberPosition = Math.max(maxSubscriberPosition, position);
}
final long rebuildPosition = Math.max(this.rebuildPosition.get(), maxSubscriberPosition);
final long hwmPosition = this.hwmPosition.getVolatile();
final long scanOutcome =
lossDetector.scan(
termBuffers[indexByPosition(rebuildPosition, positionBitsToShift)],
rebuildPosition,
hwmPosition,
now,
termLengthMask,
positionBitsToShift,
initialTermId);
final int rebuildTermOffset = (int) rebuildPosition & termLengthMask;
final long newRebuildPosition =
(rebuildPosition - rebuildTermOffset) + rebuildOffset(scanOutcome);
this.rebuildPosition.proposeMaxOrdered(newRebuildPosition);
final long ccOutcome =
congestionControl.onTrackRebuild(
now,
minSubscriberPosition,
nextSmPosition,
hwmPosition,
rebuildPosition,
newRebuildPosition,
lossFound(scanOutcome));
final int window = CongestionControlUtil.receiverWindowLength(ccOutcome);
final long threshold = CongestionControlUtil.positionThreshold(window);
if (CongestionControlUtil.shouldForceStatusMessage(ccOutcome)
|| (now > (lastStatusMessageTimestamp + statusMessageTimeout))
|| (minSubscriberPosition > (nextSmPosition + threshold))) {
scheduleStatusMessage(now, minSubscriberPosition, window);
cleanBufferTo(minSubscriberPosition - (termLengthMask + 1));
}
}
private boolean isDrained() {
long minSubscriberPosition = Long.MAX_VALUE;
for (final ReadablePosition subscriberPosition : subscriberPositions) {
minSubscriberPosition = Math.min(minSubscriberPosition, subscriberPosition.getVolatile());
}
return minSubscriberPosition >= rebuildPosition.get();
}
private void cleanBufferTo(final long newCleanPosition) {
final long cleanPosition = this.cleanPosition;
final int bytesForCleaning = (int) (newCleanPosition - cleanPosition);
final UnsafeBuffer dirtyTerm = termBuffers[indexByPosition(cleanPosition, positionBitsToShift)];
final int termOffset = (int) cleanPosition & termLengthMask;
final int length = Math.min(bytesForCleaning, dirtyTerm.capacity() - termOffset);
if (length > 0) {
dirtyTerm.setMemory(termOffset, length, (byte) 0);
this.cleanPosition = cleanPosition + length;
}
}
