/*******************************************************************************
 *  ============LICENSE_START=======================================================
 *  org.onap.dmaap
 *  ================================================================================
 *  Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 *  ================================================================================
 *  Modifications Copyright © 2021 Orange.
 *  ================================================================================
 *  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.
 *  ============LICENSE_END=========================================================
 *
 *  ECOMP is a trademark and service mark of AT&T Intellectual Property.
 *
 *******************************************************************************/

package org.onap.dmaap.mr.client.impl;

public class Clock {
    public static synchronized Clock getIt() {
        if (sfClock == null) {
            sfClock = new Clock();
        }
        return sfClock;
    }

    /**
     * Get the system's current time in milliseconds.
     *
     * @return the current time
     */
    public static long now() {
        return getIt().nowImpl();
    }

    /**
     * Get current time in milliseconds.
     *
     * @return current time in ms
     */
    protected long nowImpl() {
        return System.currentTimeMillis();
    }

    protected Clock() {
    }

    private static Clock sfClock = null;

    protected static synchronized void register(Clock testClock) {
        sfClock = testClock;
    }
}