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.runner;
  
  import java.util.function.LongConsumer;
  
  import harry.core.Configuration;
  import harry.ddl.SchemaSpec;
  import harry.model.OpSelectors;
  
  public interface DataTracker
  {
      void onLtsStarted(LongConsumer onLts);
      void onLtsFinished(LongConsumer onLts);
  
      void beginModification(long lts);
      void endModification(long lts);
  
      default void beginValidation(long pd) {}
      default void endValidation(long pd) {}
  
      long maxStarted();
      boolean isFinished(long lts);
  
      Configuration.DataTrackerConfiguration toConfig();
  
      interface DataTrackerFactory
      {
          DataTracker make(OpSelectors.PdSelector pdSelector, SchemaSpec schemaSpec);
      }
  
      DataTracker NO_OP = new NoOpDataTracker();
  
      class NoOpDataTracker implements DataTracker
      {
          private NoOpDataTracker() {}
  
          public void onLtsStarted(LongConsumer onLts){}
          public void onLtsFinished(LongConsumer onLts){}
  
          public void beginModification(long lts){}
          public void endModification(long lts){}
  
          public long maxStarted() { return 0; }
          public boolean isFinished(long lts) { return false; }
  
          public Configuration.DataTrackerConfiguration toConfig(){ return null; }
      }
  
  }
  