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Common utilities for Google APIs in Java

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/*
 * Copyright 2017, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.google.api.core;

import java.io.ObjectStreamException;
import java.io.Serializable;
import java.util.concurrent.TimeUnit;

/**
 * Implementation of the {@link ApiClock} interface, which uses {@link System#currentTimeMillis()}
 * as time source.
 */
public final class CurrentMillisClock implements ApiClock, Serializable {

  private static final long serialVersionUID = -6019259882852183285L;
  private static final ApiClock DEFAULT_CLOCK = new CurrentMillisClock();

  public static ApiClock getDefaultClock() {
    return DEFAULT_CLOCK;
  }

  private CurrentMillisClock() {}

  @Override
  public long nanoTime() {
    return TimeUnit.NANOSECONDS.convert(millisTime(), TimeUnit.MILLISECONDS);
  }

  @Override
  public long millisTime() {
    return System.currentTimeMillis();
  }

  private Object readResolve() throws ObjectStreamException {
    return DEFAULT_CLOCK;
  }
}