zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/IZkDataListener.java

/**
 * Copyright 2010 the original author or authors.
 *
 * Licensed 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.helix.zookeeper.zkclient;

/**
 * An {@link IZkDataListener} can be registered at a {@link ZkClient} for listening on zk data changes for a given path.
 *
 * Node: Also this listener re-subscribes it watch for the path on each zk event (zk watches are one-timers) is is not
 * guaranteed that events on the path are missing (see http://zookeeper.wiki.sourceforge.net/ZooKeeperWatches). An
 * implementation of this class should take that into account.
 */
public interface IZkDataListener {

    public void handleDataChange(String dataPath, Object data) throws Exception;

    public void handleDataDeleted(String dataPath) throws Exception;
}