public void waitUntilDone(Set<String> workIDs) throws KeeperException, InterruptedException {
final String condVar = new String("cond");
Watcher watcher =
new Watcher() {
@Override
public void process(WatchedEvent event) {
switch (event.getType()) {
case NodeChildrenChanged:
synchronized (condVar) {
condVar.notify();
}
break;
case NodeCreated:
case NodeDataChanged:
case NodeDeleted:
case None:
log.info("Got unexpected zookeeper event: " + event.getType() + " for " + path);
break;
}
}
};
List<String> children = zoo.getChildren(path, watcher);
while (!Collections.disjoint(children, workIDs)) {
synchronized (condVar) {
condVar.wait(10000);
}
children = zoo.getChildren(path, watcher);
}
}
public void startProcessing(final Processor processor, ThreadPoolExecutor executorService)
throws KeeperException, InterruptedException {
threadPool = (ThreadPoolExecutor) executorService;
zoo.mkdirs(path);
zoo.mkdirs(path + "/" + LOCKS_NODE);
List<String> children =
zoo.getChildren(
path,
new Watcher() {
@Override
public void process(WatchedEvent event) {
switch (event.getType()) {
case NodeChildrenChanged:
if (event.getPath().equals(path))
try {
lookForWork(processor, zoo.getChildren(path, this));
} catch (KeeperException e) {
log.error("Failed to look for work", e);
} catch (InterruptedException e) {
log.info("Interrupted looking for work", e);
}
else
log.info("Unexpected path for NodeChildrenChanged event " + event.getPath());
break;
case NodeCreated:
case NodeDataChanged:
case NodeDeleted:
case None:
log.info("Got unexpected zookeeper event: " + event.getType() + " for " + path);
break;
}
}
});
lookForWork(processor, children);
Random r = new Random();
// Add a little jitter to avoid all the tservers slamming zookeeper at once
SimpleTimer.getInstance()
.schedule(
new Runnable() {
@Override
public void run() {
try {
lookForWork(processor, zoo.getChildren(path));
} catch (KeeperException e) {
log.error("Failed to look for work", e);
} catch (InterruptedException e) {
log.info("Interrupted looking for work", e);
}
}
},
r.nextInt(60 * 1000),
60 * 1000);
}
public List<String> getWorkQueued() throws KeeperException, InterruptedException {
ArrayList<String> children = new ArrayList<String>(zoo.getChildren(path));
children.remove(LOCKS_NODE);
return children;
}