content: /*
   * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
   * 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 me.ahoo.cosid.machine;
  
  import me.ahoo.cosid.snowflake.exception.ClockTooManyBackwardsException;
  
  import com.google.errorprone.annotations.ThreadSafe;
  
  /**
   * Clock Backwards Synchronizer.
   *
   * @author ahoo wang
   */
  @ThreadSafe
  public interface ClockBackwardsSynchronizer {
      ClockBackwardsSynchronizer DEFAULT = new DefaultClockBackwardsSynchronizer();
  
      void sync(long lastTimestamp) throws InterruptedException, ClockTooManyBackwardsException;
  
      void syncUninterruptibly(long lastTimestamp) throws ClockTooManyBackwardsException;
  
      static long getBackwardsTimeStamp(long lastTimestamp) {
          return lastTimestamp - System.currentTimeMillis();
      }
  }
  
  