查看本类的 API文档回源码主页

   /*
    * Copyright 2016 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.handler.codec;
  
  import io.netty.microbench.util.AbstractMicrobenchmark;
  import io.netty.util.internal.RecyclableArrayList;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Param;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.TearDown;
  
  import java.util.ArrayList;
  import java.util.List;
  
  @State(Scope.Benchmark)
  public class CodecOutputListBenchmark extends AbstractMicrobenchmark {
  
      private static final Object ELEMENT = new Object();
      private CodecOutputList codecOutputList;
      private RecyclableArrayList recycleableArrayList;
      private List<Object> arrayList;
  
      @Param({ "1", "4" })
      public int elements;
  
      @TearDown
      public void destroy() {
          codecOutputList.recycle();
          recycleableArrayList.recycle();
      }
  
      @Benchmark
      public void codecOutList() {
          codecOutputList = CodecOutputList.newInstance();
          benchmarkAddAndClear(codecOutputList, elements);
      }
  
      @Benchmark
      public void recyclableArrayList() {
          recycleableArrayList = RecyclableArrayList.newInstance(16);
          benchmarkAddAndClear(recycleableArrayList, elements);
      }
  
      @Benchmark
      public void arrayList() {
          arrayList = new ArrayList<Object>(16);
          benchmarkAddAndClear(arrayList, elements);
      }
  
      private static void benchmarkAddAndClear(List<Object> list, int elements) {
          for (int i = 0; i < elements; i++) {
              list.add(ELEMENT);
          }
          list.clear();
      }
  }