@Override
public <A> void delete(long recid, Serializer<A> serializer) {
assert (recid > 0);
final long ioRecid = IO_USER_START + recid * 8;
final Lock lock;
if (disableLocks) {
lock = null;
} else {
lock = locks[Store.lockPos(ioRecid)].writeLock();
lock.lock();
}
try {
// get index val and zero it out
final long indexVal = index.getLong(ioRecid);
index.putLong(ioRecid, 0L | MASK_ARCHIVE);
if (!spaceReclaimTrack) return; // free space is not tracked, so do not mark stuff as free
long[] linkedRecords = getLinkedRecordsIndexVals(indexVal);
// now lock everything and mark free space
if (!disableLocks) {
structuralLock.lock();
}
try {
// free recid
freeIoRecidPut(ioRecid);
// free first record pointed from indexVal\
if ((indexVal >>> 48) > 0) freePhysPut(indexVal, false);
// if there are more linked records, free those as well
if (linkedRecords != null) {
for (int i = 0; i < linkedRecords.length && linkedRecords[i] != 0; i++) {
freePhysPut(linkedRecords[i], false);
}
}
} finally {
if (!disableLocks) {
structuralLock.unlock();
}
}
} finally {
if (!disableLocks) {
lock.unlock();
}
}
}
protected void update2(DataIO.DataOutputByteArray out, long ioRecid) {
final long indexVal = index.getLong(ioRecid);
final int size = (int) (indexVal >>> 48);
final boolean linked = (indexVal & MASK_LINKED) != 0;
assert (disableLocks || locks[Store.lockPos(ioRecid)].writeLock().isHeldByCurrentThread());
if (!linked && out.pos > 0 && size > 0 && size2ListIoRecid(size) == size2ListIoRecid(out.pos)) {
// size did change, but still fits into this location
final long offset = indexVal & MASK_OFFSET;
// note: if size would not change, we still have to write MASK_ARCHIVE bit
index.putLong(ioRecid, (((long) out.pos) << 48) | offset | MASK_ARCHIVE);
phys.putData(offset, out.buf, 0, out.pos);
} else {
long[] indexVals = spaceReclaimTrack ? getLinkedRecordsIndexVals(indexVal) : null;
if (!disableLocks) {
structuralLock.lock();
}
try {
if (spaceReclaimTrack) {
// free first record pointed from indexVal
if (size > 0) freePhysPut(indexVal, false);
// if there are more linked records, free those as well
if (indexVals != null) {
for (int i = 0; i < indexVals.length && indexVals[i] != 0; i++) {
freePhysPut(indexVals[i], false);
}
}
}
indexVals = physAllocate(out.pos, true, false);
} finally {
if (!disableLocks) {
structuralLock.unlock();
}
}
put2(out, ioRecid, indexVals);
}
assert (disableLocks || locks[Store.lockPos(ioRecid)].writeLock().isHeldByCurrentThread());
}
protected long longStackTake(final long ioList, boolean recursive) {
assert (disableLocks || structuralLock.isHeldByCurrentThread());
assert (ioList >= IO_FREE_RECID && ioList < IO_USER_START) : "wrong ioList: " + ioList;
long dataOffset = index.getLong(ioList);
if (dataOffset == 0) return 0; // there is no such list, so just return 0
long pos = dataOffset >>> 48;
dataOffset &= MASK_OFFSET;
if (pos < 8) throw new AssertionError();
final long ret = phys.getSixLong(dataOffset + pos);
// was it only record at that page?
if (pos == 8) {
// yes, delete this page
long next = phys.getLong(dataOffset);
long size = next >>> 48;
next &= MASK_OFFSET;
if (next != 0) {
// update index so it points to previous page
long nextSize = phys.getUnsignedShort(next);
assert ((nextSize - 8) % 6 == 0);
index.putLong(ioList, ((nextSize - 6) << 48) | next);
} else {
// zero out index
index.putLong(ioList, 0L);
if (maxUsedIoList == ioList) {
// max value was just deleted, so find new maxima
while (index.getLong(maxUsedIoList) == 0 && maxUsedIoList > IO_FREE_RECID) {
maxUsedIoList -= 8;
}
}
}
// put space used by this page into free list
freePhysPut((size << 48) | dataOffset, true);
} else {
// no, it was not last record at this page, so just decrement the counter
pos -= 6;
index.putLong(ioList, (pos << 48) | dataOffset); // TODO update just 2 bytes
}
// System.out.println("longStackTake: "+ioList+" - "+ret);
return ret;
}
protected long freePhysTake(int size, boolean ensureAvail, boolean recursive) {
assert (disableLocks || structuralLock.isHeldByCurrentThread());
assert (size > 0);
// check free space
if (spaceReclaimReuse) {
long ret = longStackTake(size2ListIoRecid(size), recursive);
if (ret != 0) {
freeSize -= roundTo16(size);
return ret;
}
}
// try to take large record and split it into two
if (!recursive && spaceReclaimSplit) {
for (long s = roundTo16(size) + 16; s < MAX_REC_SIZE; s += 16) {
final long ioList = size2ListIoRecid(s);
if (ioList > maxUsedIoList) break;
long ret = longStackTake(ioList, recursive);
if (ret != 0) {
// found larger record, split in two slices, take first, mark second free
final long offset = ret & MASK_OFFSET;
long remaining = s - roundTo16(size);
long markFree = (remaining << 48) | (offset + s - remaining);
freePhysPut(markFree, recursive);
freeSize -= roundTo16(s);
return (((long) size) << 48) | offset;
}
}
}
// not available, increase file size
if ((physSize & SLICE_SIZE_MOD_MASK) + size > SLICE_SIZE)
physSize += SLICE_SIZE - (physSize & SLICE_SIZE_MOD_MASK);
long physSize2 = physSize;
physSize = roundTo16(physSize + size);
if (ensureAvail) phys.ensureAvailable(physSize);
return physSize2;
}
