@Override
public void performBackgroundOperation(final OperationAndData<String> operationAndData)
throws Exception {
final TimeTrace trace = client.getZookeeperClient().startTracer("ExistsBuilderImpl-Background");
AsyncCallback.StatCallback callback =
new AsyncCallback.StatCallback() {
@Override
public void processResult(int rc, String path, Object ctx, Stat stat) {
trace.commit();
CuratorEvent event =
new CuratorEventImpl(
CuratorEventType.EXISTS, rc, path, null, ctx, stat, null, null, null, null);
client.processBackgroundOperation(operationAndData, event);
}
};
if (watching.isWatched()) {
client
.getZooKeeper()
.exists(operationAndData.getData(), true, callback, backgrounding.getContext());
} else {
client
.getZooKeeper()
.exists(
operationAndData.getData(),
watching.getWatcher(),
callback,
backgrounding.getContext());
}
}
@Override
public Stat forPath(String path) throws Exception {
path = client.fixForNamespace(path);
Stat returnStat = null;
if (backgrounding.inBackground()) {
client.processBackgroundOperation(
new OperationAndData<String>(this, path, backgrounding.getCallback()), null);
} else {
returnStat = pathInForeground(path);
}
return returnStat;
}
private Stat pathInForeground(final String path) throws Exception {
TimeTrace trace = client.getZookeeperClient().startTracer("ExistsBuilderImpl-Foreground");
Stat returnStat =
RetryLoop.callWithRetry(
client.getZookeeperClient(),
new Callable<Stat>() {
@Override
public Stat call() throws Exception {
Stat returnStat;
if (watching.isWatched()) {
returnStat = client.getZooKeeper().exists(path, true);
} else {
returnStat = client.getZooKeeper().exists(path, watching.getWatcher());
}
return returnStat;
}
});
trace.commit();
return returnStat;
}
Watching(CuratorFrameworkImpl client, CuratorWatcher watcher) {
this.watcher = client.getNamespaceWatcherMap().getNamespaceWatcher(watcher);
this.watched = false;
}