public int releaseLock(UTF8 src, UTF8 holder) {
TreeSet holders = (TreeSet) activeLocks.get(src);
if (holders != null && holders.contains(holder)) {
holders.remove(holder);
if (holders.size() == 0) {
activeLocks.remove(src);
}
return COMPLETE_SUCCESS;
} else {
return OPERATION_FAILED;
}
}
public int obtainLock(UTF8 src, UTF8 holder, boolean exclusive) {
TreeSet holders = (TreeSet) activeLocks.get(src);
if (holders == null) {
holders = new TreeSet();
activeLocks.put(src, holders);
}
if (exclusive && holders.size() > 0) {
return STILL_WAITING;
} else {
holders.add(holder);
return COMPLETE_SUCCESS;
}
}
/** Returns whether the given block is one pointed-to by a file. */
public boolean isValidBlock(Block b) {
synchronized (rootDir) {
if (activeBlocks.contains(b)) {
return true;
} else {
return false;
}
}
}
boolean unprotectedAddFile(UTF8 name, Block blocks[]) {
synchronized (rootDir) {
if (blocks != null) {
// Add file->block mapping
for (int i = 0; i < blocks.length; i++) {
activeBlocks.add(blocks[i]);
}
}
return (rootDir.addNode(name.toString(), blocks) != null);
}
}
Block[] unprotectedDelete(UTF8 src) {
synchronized (rootDir) {
INode targetNode = rootDir.getNode(src.toString());
if (targetNode == null) {
return null;
} else {
//
// Remove the node from the namespace and GC all
// the blocks underneath the node.
//
if (!targetNode.removeNode()) {
return null;
} else {
Vector v = new Vector();
targetNode.collectSubtreeBlocks(v);
for (Iterator it = v.iterator(); it.hasNext(); ) {
Block b = (Block) it.next();
activeBlocks.remove(b);
}
return (Block[]) v.toArray(new Block[v.size()]);
}
}
}
}
