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.activemq.artemis.tests.performance.jmh;
  
  import org.apache.activemq.artemis.utils.collections.ConcurrentAppendOnlyChunkedList;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Measurement;
  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;
  
  @State(Scope.Benchmark)
  @Fork(2)
  @Warmup(iterations = 5, time = 1)
  @Measurement(iterations = 8, time = 1)
  public class ConcurrentAppendOnlyChunkListLookupBenchmark {
  
     private static final Integer MSG = 0;
  
     @Param({"1000", "10000"})
     int size;
  
     @Param({"32"})
     int chunkSize;
  
     private ConcurrentAppendOnlyChunkedList<Integer> list;
  
     @Setup
     public void init() {
        list = new ConcurrentAppendOnlyChunkedList<>(chunkSize);
        for (int i = 0; i < size; i++) {
           list.add(MSG);
        }
     }
  
     @State(Scope.Thread)
     public static class Index {
  
        private int size;
        private int index;
  
        @Setup
        public void init(ConcurrentAppendOnlyChunkListLookupBenchmark benchmark) {
           index = 0;
           size = benchmark.size;
        }
  
        public int next() {
           index++;
           if (index == size) {
              index = 0;
              return 0;
           }
           return index;
        }
     }
  
     @Benchmark
     public Integer lookup(Index index) {
        return list.get(index.next());
     }
  
  }
  