/**
* 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 java.util.List;
import org.apache.zookeeper.AsyncCallback.Children2Callback;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;
/**
* <code>ChildrenChangedOperation</code> is an watch driven operation.
* It will wait for an watched event indicating that the children associated with a
* given node have been modified before retrieving the changed list.
*/
public class ChildrenChangedOperation extends FutureEventDrivenOperation<List<String>> {
private boolean getChangedListing;
public ChildrenChangedOperation(ZooKeeper connection, String znode) {
this(connection, znode, true);
}
public ChildrenChangedOperation(ZooKeeper connection, String znode, boolean getChangedListing) {
super(connection, znode, EventType.NodeChildrenChanged);
this.getChangedListing = getChangedListing;
}
@Override
protected void installWatch() {
connection.getChildren(getNode(), this, new Children2Callback() {
public void processResult(int rc, String path, Object ctx, List<String> children, Stat stat) {
}
}, null);
}
@Override
public OperationResult<List<String>> getResult() {
return getChangedListing ? new GetChildrenOperation(connection, node).getResult() : null;
}
@Override
@SuppressWarnings("rawtypes")
public ZooKeeperOperation createCopy() throws Exception {
ChildrenChangedOperation copy = (ChildrenChangedOperation) super.createCopy();
copy.getChangedListing = getChangedListing;
return copy;
}
}