private static boolean processAvailData(TapeWriteStage ss) {
int byteHeadPos;
long headPos;
// get the new head position
byteHeadPos = RingBuffer.bytesHeadPosition(ss.source);
headPos = RingBuffer.headPosition(ss.source);
while (byteHeadPos != RingBuffer.bytesHeadPosition(ss.source)
|| headPos != RingBuffer.headPosition(ss.source)) {
byteHeadPos = RingBuffer.bytesHeadPosition(ss.source);
headPos = RingBuffer.headPosition(ss.source);
}
// we have established the point that we can read up to, this value is changed by the writer on
// the other side
// get the start and stop locations for the copy
// now find the point to start reading from, this is moved forward with each new read.
int pMask = ss.source.mask;
long tempTail = RingBuffer.tailPosition(ss.source);
int primaryTailPos = pMask & (int) tempTail;
long totalPrimaryCopy = (headPos - tempTail);
if (totalPrimaryCopy <= 0) {
assert (totalPrimaryCopy == 0);
return false; // nothing to copy so come back later
}
int bMask = ss.source.byteMask;
int tempByteTail = RingBuffer.bytesTailPosition(ss.source);
int byteTailPos = bMask & tempByteTail;
int totalBytesCopy = (bMask & byteHeadPos) - byteTailPos;
if (totalBytesCopy < 0) {
totalBytesCopy += (bMask + 1);
}
// now do the copies
if (doingCopy(ss, byteTailPos, primaryTailPos, (int) totalPrimaryCopy, totalBytesCopy)) {
// TODO: play back file with those cunks into indexer to do it after the fact
// release tail so data can be written
int i = RingBuffer.BYTES_WRAP_MASK & (tempByteTail + totalBytesCopy);
RingBuffer.setBytesWorkingTail(ss.source, i);
RingBuffer.setBytesTail(ss.source, i);
RingBuffer.publishWorkingTailPosition(ss.source, tempTail + totalPrimaryCopy);
return true;
}
return false; // finished all the copy for now
}
