org.apache.camel.component.zookeeper.operations.ExistenceChangedOperation Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.component.zookeeper.operations;
import org.apache.zookeeper.AsyncCallback.StatCallback;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;
/**
* DataChangedOperation is an watch driven operation. It will wait
* for an watched event indicating that a given node has been created or
* deleted.
*/
public class ExistenceChangedOperation extends FutureEventDrivenOperation {
public ExistenceChangedOperation(ZooKeeper connection, String znode) {
super(connection, znode, EventType.NodeCreated, EventType.NodeDeleted);
}
@Override
protected void installWatch() {
connection.exists(getNode(), this, new StatCallback() {
public void processResult(int rc, String path, Object ctx, Stat stat) {
}
}, null);
if (LOG.isDebugEnabled()) {
LOG.debug("Installed exists watch");
}
}
@Override
public OperationResult getResult() {
try {
String path = getNode();
Stat statistics = connection.exists(path, true);
return new OperationResult(path, statistics);
} catch (Exception e) {
return new OperationResult(e);
}
}
}