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.store.api.IKVIterator;
  import com.google.protobuf.ByteString;
  
  public class LoadRecordableKVIterator implements IKVIterator {
      private final IKVIterator delegate;
      private final IKVLoadRecorder recorder;
  
      public LoadRecordableKVIterator(IKVIterator delegate, IKVLoadRecorder recorder) {
          this.delegate = delegate;
          this.recorder = recorder;
      }
  
      @Override
      public ByteString key() {
          long start = System.nanoTime();
          ByteString result = delegate.key();
          recorder.record(result, System.nanoTime() - start);
          return result;
      }
  
      @Override
      public ByteString value() {
          long start = System.nanoTime();
          ByteString result = delegate.value();
          recorder.record(System.nanoTime() - start);
          return result;
      }
  
      @Override
      public boolean isValid() {
          return delegate.isValid();
      }
  
      @Override
      public void next() {
          long start = System.nanoTime();
          delegate.next();
          recorder.record(System.nanoTime() - start);
      }
  
      @Override
      public void prev() {
          long start = System.nanoTime();
          delegate.prev();
          recorder.record(System.nanoTime() - start);
      }
  
      @Override
      public void seekToFirst() {
          long start = System.nanoTime();
          delegate.seekToFirst();
          recorder.record(System.nanoTime() - start);
      }
  
      @Override
      public void seekToLast() {
          long start = System.nanoTime();
          delegate.seekToLast();
          recorder.record(System.nanoTime() - start);
      }
  
      @Override
      public void seek(ByteString key) {
          long start = System.nanoTime();
          delegate.seek(key);
          recorder.record(key, System.nanoTime() - start);
      }
  
      @Override
      public void seekForPrev(ByteString key) {
          long start = System.nanoTime();
          delegate.seekForPrev(key);
          recorder.record(key, System.nanoTime() - start);
      }
  }
  