@Override
public Block allocate(int blockSize) {
Block block;
synchronized (this) {
checkUpdate(Alloc);
block = blockMgr.allocate(blockSize);
Long id = block.getId();
activeWriteBlocks.add(id);
add(Alloc, id);
}
return block;
}
private void writeTracker(Block block) {
synchronized (this) {
checkUpdate(Write);
Long id = block.getId();
add(Write, id);
if (!activeWriteBlocks.contains(id)) error(Write, id + " is not an active write block");
}
}
@Override
public void release(Block block) {
synchronized (this) {
checkReadOrIter(Release);
Long id = block.getId();
add(Release, id);
if (!activeReadBlocks.contains(id)
&& !activeIterBlocks.contains(id)
&& !activeWriteBlocks.contains(id)) error(Release, id + " is not an active block");
// May have been promoted.
if (activeWriteBlocks.contains(id)) activeWriteBlocks.remove(id);
else activeReadBlocks.remove(block.getId());
activeIterBlocks.remove(block.getId());
}
blockMgr.release(block);
}
@Override
public void free(Block block) {
synchronized (this) {
checkUpdate(Free);
Long id = block.getId();
add(Free, id);
if (activeReadBlocks.contains(id)) error(Free, id + " is a read block");
else if (!activeWriteBlocks.contains(id)) error(Free, id + " is not a write block");
activeWriteBlocks.remove(id);
}
blockMgr.free(block);
}
@Override
public Block promote(Block block) {
synchronized (this) {
checkUpdate(Promote);
Long id = block.getId();
add(Promote, id);
if (!activeWriteBlocks.contains(id) && !activeReadBlocks.contains(id))
error(Promote, id + " is not an active block");
if (activeReadBlocks.contains(id))
// Remove one read count
// Really, do this if obtained via "getRead" and not "getWrite"
activeReadBlocks.remove(id);
// Double promotion results in only one entry.
if (!activeWriteBlocks.contains(id)) activeWriteBlocks.add(id);
}
return blockMgr.promote(block);
}