/**
 *
 * 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 zk_lock.imp.lock;

import org.apache.zookeeper.KeeperException;

/**
 * A callback object which can be used for implementing retry-able operations in the 
 * {@link org.apache.zookeeper.recipes.lock.ProtocolSupport} class
 *
 */
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;
}