storage-handlers/hbase/src/java/org/apache/hcatalog/hbase/snapshot/lock/ZooKeeperOperation.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.hcatalog.hbase.snapshot.lock;

import org.apache.zookeeper.KeeperException;

/**
 * A callback object which can be used for implementing retry-able operations in the
 * {@link org.apache.hcatalog.hbase.snapshot.lock.ProtocolSupport} class
 *  This class has been used as-is from the zookeeper 3.4.0 with change in the
 *  package name .
 */
public interface ZooKeeperOperation {

    /**
     * Performs the operation - which may be involved multiple times if the connection
     * to ZooKeeper closes during this operation
     *
     * @return the result of the operation or null
     * @throws KeeperException
     * @throws InterruptedException
     */
    public boolean execute() throws KeeperException, InterruptedException;
}