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 org.apache.bifromq.basekv.store.range;
  
  import org.apache.bifromq.basekv.proto.Boundary;
  import org.apache.bifromq.basekv.store.api.IKVIterator;
  import org.apache.bifromq.basekv.store.api.IKVReader;
  import com.google.protobuf.ByteString;
  import java.util.Optional;
  
  class LoadRecordableKVReader implements IKVReader {
      private final IKVReader delegate;
      private final IKVLoadRecorder recorder;
  
      LoadRecordableKVReader(IKVReader delegate, IKVLoadRecorder recorder) {
          this.delegate = delegate;
          this.recorder = recorder;
      }
  
      @Override
      public Boundary boundary() {
          return delegate.boundary();
      }
  
      @Override
      public long size(Boundary boundary) {
          return delegate.size(boundary);
      }
  
      @Override
      public boolean exist(ByteString key) {
          long start = System.nanoTime();
          boolean result = delegate.exist(key);
          recorder.record(key, System.nanoTime() - start);
          return result;
      }
  
      @Override
      public Optional<ByteString> get(ByteString key) {
          long start = System.nanoTime();
          Optional<ByteString> result = delegate.get(key);
          recorder.record(key, System.nanoTime() - start);
          return result;
      }
  
      @Override
      public IKVIterator iterator() {
          return new LoadRecordableKVIterator(delegate.iterator(), recorder);
      }
  
      @Override
      public void refresh() {
          long start = System.nanoTime();
          delegate.refresh();
          recorder.record(System.nanoTime() - start);
      }
  }
  