twill-zookeeper/src/main/java/org/apache/twill/zookeeper/NodeData.java

/*
 * 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.twill.zookeeper;

import org.apache.zookeeper.data.Stat;

import javax.annotation.Nullable;

/**
 * Represents result of call to {@link ZKClient#getData(String, org.apache.zookeeper.Watcher)}.
 */
public interface NodeData {

  /**
   * @return The {@link Stat} of the node.
   */
  Stat getStat();

  /**
   * @return Data stored in the node, or {@code null} if there is no data.
   */
  @Nullable
  byte[] getData();
}