@Override
public Block allocate(int size) {
if (size <= 0) {
throw new OutOfBoundException("Size can't be negative or be zero: " + size);
}
metrics.increment("vmtable.totalAllocations");
TimeContext timer = metrics.getTimer("vmtable.allocationTime");
timer.start();
final TableBlock freeBlock = findBlockToAllocateFrom(size);
if (freeBlock != null) {
final TableBlock result;
try {
result = new TableBlock(freeBlock.getAddress(), size);
if (freeBlock.getSize() == size) {
freeBlock.resize(0, 0);
removeBlock(free, freeBlock, freeLock);
metrics.decrement("vmtable.fragmentation");
} else {
freeBlock.resize(freeBlock.getAddress() + size, freeBlock.getSize() - size);
metrics.increment("vmtable.fragmentation");
}
freeMemorySize.addAndGet(-size);
} finally {
// unlock asap
freeBlock.unlock();
}
insertBlock(used, result, usedLock);
usedMemorySize.addAndGet(size);
timer.stop();
metrics.mark("vmtable.freeSize", freeMemorySize.longValue());
metrics.mark("vmtable.usedSize", usedMemorySize.longValue());
metrics.mark("vmtable.freeBlocksCount", free.size());
metrics.mark("vmtable.usedBlocksCount", used.size());
return result;
}
timer.stop();
metrics.increment("vmtable.failedAllocations");
return null;
}
@Override
public boolean free(Block block) {
if (block == null) {
return false;
}
metrics.increment("vmtable.totalFrees");
TimeContext timer = metrics.getTimer("vmtable.freeTime");
timer.start();
TableBlock tableBlock = getSimilarBlock(used, block, usedLock);
if (tableBlock != null) {
if (removeBlock(used, tableBlock, usedLock)) {
int size = tableBlock.getSize();
usedMemorySize.addAndGet(-size);
addFreeBlock(new TableBlock(tableBlock.getAddress(), tableBlock.getSize()));
freeMemorySize.addAndGet(size);
tableBlock.resize(0, 0);
tableBlock.unlock();
timer.stop();
metrics.mark("vmtable.freeSize", freeMemorySize.longValue());
metrics.mark("vmtable.usedSize", usedMemorySize.longValue());
metrics.mark("vmtable.freeBlocksCount", free.size());
metrics.mark("vmtable.usedBlocksCount", used.size());
return true;
}
}
timer.stop();
metrics.increment("vmtable.failedFrees");
return false;
}