/*
 * Copyright 2015 Open Networking Laboratory
 *
 * 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.onosproject.store.intent.impl;

import org.onosproject.net.intent.IntentData;
import org.onosproject.store.Timestamp;
import org.onosproject.store.service.ClockService;
import org.onosproject.store.service.MultiValuedTimestamp;

import java.util.concurrent.atomic.AtomicLong;

/**
 * ClockService that generates logical timestamps based on IntentData versions.
 */
public class IntentDataLogicalClockManager<K> implements ClockService<K, IntentData> {

    private final AtomicLong sequenceNumber = new AtomicLong(0);

    @Override
    public Timestamp getTimestamp(K key, IntentData intentData) {
        return new MultiValuedTimestamp<>(intentData.version(),
                                          sequenceNumber.getAndIncrement());
    }
}