com.epam.deltix.qsrv.hf.pub.TimeSource Maven / Gradle / Ivy

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/*
 * Copyright 2021 EPAM Systems, Inc
 *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. 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 com.epam.deltix.qsrv.hf.pub;


/**
 * Service that returns current time (real or simulated).
 *
 * Possible extensions: ApproximateTimeService, MarketTimeService
 */
public interface TimeSource {
    /** @return the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. */
    long currentTimeMillis();

    /**
     * @return current time in nanoseconds
     */
    default long currentTimeNanos() {
        return currentTimeMillis() * 1_000_000L;
    }
}