@Stage("Segment")
public long allocReturnCode(int chunks) {
VanillaChronicleHash<?, ?, ?, ?> h = hh.h();
if (chunks > h.maxChunksPerEntry) {
throw new IllegalArgumentException(
"Entry is too large: requires "
+ chunks
+ " chucks, "
+ h.maxChunksPerEntry
+ " is maximum.");
}
long lowestPossiblyFreeChunk = lowestPossiblyFreeChunk();
if (lowestPossiblyFreeChunk + chunks > h.actualChunksPerSegmentTier) return -1;
if (tierEntries() >= h.maxEntriesPerHashLookup) return -1;
assert lowestPossiblyFreeChunk < h.actualChunksPerSegmentTier;
long ret = freeList.setNextNContinuousClearBits(lowestPossiblyFreeChunk, chunks);
if (ret == NOT_FOUND || ret + chunks > h.actualChunksPerSegmentTier) {
if (ret + chunks > h.actualChunksPerSegmentTier) {
assert ret != NOT_FOUND;
freeList.clearRange(ret, ret + chunks);
}
return -1;
} else {
tierEntries(tierEntries() + 1);
// if bit at lowestPossiblyFreeChunk is clear, it was skipped because
// more than 1 chunk was requested. Don't move lowestPossiblyFreeChunk
// in this case. chunks == 1 clause is just a fast path.
if (chunks == 1 || freeList.isSet(lowestPossiblyFreeChunk)) {
lowestPossiblyFreeChunk(ret + chunks);
}
return ret;
}
}
@Stage("Segment")
public boolean realloc(long fromPos, int oldChunks, int newChunks) {
if (fromPos + newChunks < hh.h().actualChunksPerSegmentTier
&& freeList.isRangeClear(fromPos + oldChunks, fromPos + newChunks)) {
freeList.setRange(fromPos + oldChunks, fromPos + newChunks);
// checking and updating lowestPossiblyFreeChunk is omitted because adds computational
// complexity for seemingly very small gain
return true;
} else {
return false;
}
}
void initSegment() {
VanillaChronicleHash<?, ?, ?, ?> h = hh.h();
long segmentBaseAddr = this.tierBaseAddr;
segmentBS.set(segmentBaseAddr, h.tierSize);
segmentBytes.clear();
long freeListOffset = h.tierHashLookupOuterSize + TIER_COUNTERS_AREA_SIZE;
freeList.setOffset(segmentBaseAddr + freeListOffset);
entrySpaceOffset = freeListOffset + h.tierFreeListOuterSize + h.tierEntrySpaceInnerOffset;
}
@Stage("Segment")
public void freeExtra(long pos, int oldChunks, int newChunks) {
long from = pos + newChunks;
freeList.clearRange(from, pos + oldChunks);
if (from < lowestPossiblyFreeChunk()) lowestPossiblyFreeChunk(from);
}
@Stage("Segment")
public void free(long fromPos, int chunks) {
tierEntries(tierEntries() - 1);
freeList.clearRange(fromPos, fromPos + chunks);
if (fromPos < lowestPossiblyFreeChunk()) lowestPossiblyFreeChunk(fromPos);
}