public void release() throws DLockException {
if (Objects.isNull(lockPath)) {
return;
}
try {
zookeeper.deleteLockNode(lockPath);
lockPath = null;
} catch (InterruptedException | KeeperException e) {
throw new DLockException("failed to release the lock", e);
}
}
private void doLock() throws KeeperException, InterruptedException {
final String lockName = "lock-";
lockPath = zookeeper.createLockNode(resourcePath + "/" + lockName);
final Object lock = new Object();
while (true) {
synchronized (lock) {
List<String> children =
zookeeper.getChildren(
resourcePath,
new Watcher() {
@Override
public void process(WatchedEvent event) {
lock.notifyAll();
}
});
Collections.sort(children);
for (String child : children) {
if (!child.startsWith(lockName)) {
continue;
}
if (lockPath.endsWith(child)) {
return;
} else {
break;
}
}
// some events may get lost
// retry interval should be set to avoid wait forever
lock.wait(RETRY_INTERVAL);
}
}
}
