package org.apache.helix.zookeeper.zkclient;

/*
 * 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.
 */

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

public class ZkLock extends ReentrantLock {

    private static final long serialVersionUID = 1L;

    private Condition _dataChangedCondition = newCondition();
    private Condition _stateChangedCondition = newCondition();
    private Condition _zNodeEventCondition = newCondition();

    /**
     * This condition will be signaled if a zookeeper event was processed and the event contains a data/child change.
     *
     * @return the condition.
     */
    public Condition getDataChangedCondition() {
        return _dataChangedCondition;
    }

    /**
     * This condition will be signaled if a zookeeper event was processed and the event contains a state change
     * (connected, disconnected, session expired, etc ...).
     *
     * @return the condition.
     */
    public Condition getStateChangedCondition() {
        return _stateChangedCondition;
    }

    /**
     * This condition will be signaled if any znode related zookeeper event was received.
     *
     * @return the condition.
     */
    public Condition getZNodeEventCondition() {
        return _zNodeEventCondition;
    }
}