content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 harry.model.clock;
  
  import java.util.concurrent.atomic.AtomicLong;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.fasterxml.jackson.annotation.JsonTypeName;
  import harry.core.Configuration;
  import harry.model.OpSelectors;
  
  public class OffsetClock implements OpSelectors.Clock
  {
      final AtomicLong lts;
  
      private final long base;
  
      public OffsetClock(long base)
      {
          this(ApproximateClock.START_VALUE, base);
      }
  
      public OffsetClock(long startValue, long base)
      {
          this.lts = new AtomicLong(startValue);
          this.base = base;
      }
  
      public long rts(long lts)
      {
          return base + lts;
      }
  
      public long lts(long rts)
      {
          return rts - base;
      }
  
      public long nextLts()
      {
          return lts.getAndIncrement();
      }
  
      public long peek()
      {
          return lts.get();
      }
  
      public Configuration.ClockConfiguration toConfig()
      {
          return new OffsetClockConfiguration(lts.get(), base);
      }
  
      @JsonTypeName("offset")
      public static class OffsetClockConfiguration implements Configuration.ClockConfiguration
      {
          public final long offset;
          public final long base;
  
          @JsonCreator
          public OffsetClockConfiguration(@JsonProperty("offset") long offset,
                                          @JsonProperty(value = "base", defaultValue = "0") long base)
          {
              this.offset = offset;
              this.base = base;
          }
  
          public OpSelectors.Clock make()
          {
              return new OffsetClock(base, offset);
          }
      }
  }
  