Example usage for org.apache.zookeeper WatchedEvent getType

Introduction

In this page you can find the example usage for org.apache.zookeeper WatchedEvent getType.

Prototype

public EventType getType()

Source Link

Usage

From source file:zookeeper.recipes.leader.LeaderLatch.java

License:Apache License

private void checkLeadership(List<String> children) throws Exception {
    List<String> sortedChildren = LockInternals.getSortedChildren(LOCK_NAME, sorter, children);
    int ourIndex = (ourPath != null) ? sortedChildren.indexOf(ZKPaths.getNodeFromPath(ourPath)) : -1;
    if (ourIndex < 0) {
        log.error("Can't find our node. Resetting. Index: " + ourIndex);
        reset();// w ww .  j  a v  a2s  .  c om
    } else if (ourIndex == 0) {
        setLeadership(true);
    } else {
        String watchPath = sortedChildren.get(ourIndex - 1);
        Watcher watcher = new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                if ((state.get() == State.STARTED) && (event.getType() == Event.EventType.NodeDeleted)
                        && (ourPath != null)) {
                    try {
                        getChildren();
                    } catch (Exception ex) {
                        log.error("An error occurred checking the leadership.", ex);
                    }
                }
            }
        };

        BackgroundCallback callback = new BackgroundCallback() {
            @Override
            public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                if (event.getResultCode() == KeeperException.Code.NONODE.intValue()) {
                    // previous node is gone - reset
                    reset();
                }
            }
        };
        client.checkExists().usingWatcher(watcher).inBackground(callback)
                .forPath(ZKPaths.makePath(latchPath, watchPath));
    }
}