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.kafka.jmh.common;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.utils.ImplicitLinkedHashCollection;
  
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Param;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.Warmup;
  
  import java.util.Comparator;
  import java.util.concurrent.TimeUnit;
  
  @State(Scope.Benchmark)
  @Fork(value = 1)
  @Warmup(iterations = 3)
  @Measurement(iterations = 6)
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.MICROSECONDS)
  public class ImplicitLinkedHashCollectionBenchmark {
      public static class TestElement implements ImplicitLinkedHashCollection.Element {
          private final String value;
          private int next = ImplicitLinkedHashCollection.INVALID_INDEX;
          private int prev = ImplicitLinkedHashCollection.INVALID_INDEX;
  
          public TestElement(String value) {
              this.value = value;
          }
  
          public String value() {
              return value;
          }
  
          @Override
          public int prev() {
              return this.prev;
          }
  
          @Override
          public void setPrev(int prev) {
              this.prev = prev;
          }
  
          @Override
          public int next() {
              return this.next;
          }
  
          @Override
          public void setNext(int next) {
              this.next = next;
          }
  
          @Override
          public int hashCode() {
              return value.hashCode();
          }
  
          @Override
          public boolean equals(Object o) {
              if (!(o instanceof TestElement other)) return false;
              return value.equals(other.value);
          }
      }
  
      public static class TestElementComparator implements Comparator<TestElement> {
          public static final TestElementComparator INSTANCE = new TestElementComparator();
  
          @Override
          public int compare(TestElement a, TestElement b) {
              return a.value().compareTo(b.value());
          }
      }
  
      @Param({"10000", "100000"})
      private int size;
  
      private ImplicitLinkedHashCollection<TestElement> coll;
  
      @Setup(Level.Trial)
      public void setup() {
          coll = new ImplicitLinkedHashCollection<>();
          for (int i = 0; i < size; i++) {
              coll.add(new TestElement(Uuid.randomUuid().toString()));
          }
      }
  
      /**
       * Test sorting the collection entries.
       */
      @Benchmark
      public ImplicitLinkedHashCollection<TestElement> testCollectionSort() {
          coll.sort(TestElementComparator.INSTANCE);
          return coll;
      }
  }
  