/**
* Perform one release of the mutex if the calling thread is the same thread that acquired it. If
* the thread had made multiple calls to acquire, the mutex will still be held when this method
* returns.
*
* @throws Exception ZK errors, interruptions, current thread does not own the lock
*/
@Override
public void release() throws Exception {
/*
Note on concurrency: a given lockData instance
can be only acted on by a single thread so locking isn't necessary
*/
Thread currentThread = Thread.currentThread();
LockData lockData = threadData.get(currentThread);
if (lockData == null) {
throw new IllegalMonitorStateException("You do not own the lock: " + basePath);
}
int newLockCount = lockData.lockCount.decrementAndGet();
if (newLockCount > 0) {
return;
}
if (newLockCount < 0) {
throw new IllegalMonitorStateException("Lock count has gone negative for lock: " + basePath);
}
try {
internals.releaseLock(lockData.lockPath);
} finally {
threadData.remove(currentThread);
}
}
@Override
public void makeRevocable(
final RevocationListener<InterProcessMutex> listener, Executor executor) {
internals.makeRevocable(
new RevocationSpec(
executor,
new Runnable() {
@Override
public void run() {
listener.revocationRequested(InterProcessMutex.this);
}
}));
}
private boolean internalLock(long time, TimeUnit unit) throws Exception {
/*
Note on concurrency: a given lockData instance
can be only acted on by a single thread so locking isn't necessary
*/
Thread currentThread = Thread.currentThread();
LockData lockData = threadData.get(currentThread);
if (lockData != null) {
// re-entering
lockData.lockCount.incrementAndGet();
return true;
}
String lockPath = internals.attemptLock(time, unit, getLockNodeBytes());
if (lockPath != null) {
LockData newLockData = new LockData(currentThread, lockPath);
threadData.put(currentThread, newLockData);
return true;
}
return false;
}
/**
* Return a sorted list of all current nodes participating in the lock
*
* @return list of nodes
* @throws Exception ZK errors, interruptions, etc.
*/
public Collection<String> getParticipantNodes() throws Exception {
return LockInternals.getParticipantNodes(
internals.getClient(), basePath, internals.getLockName(), internals.getDriver());
}
