content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.csp.sentinel.benchmark;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.concurrent.ThreadLocalRandom;
  import java.util.concurrent.TimeUnit;
  
  import com.alibaba.csp.sentinel.Entry;
  import com.alibaba.csp.sentinel.SphU;
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  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.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  
  /**
   * Benchmark for Sentinel entries.
   *
   * @author Eric Zhao
   */
  @Warmup(iterations = 10)
  @BenchmarkMode(Mode.Throughput)
  @OutputTimeUnit(TimeUnit.SECONDS)
  @State(Scope.Thread)
  public class SentinelEntryBenchmark {
  
      @Param({"25", "50", "100", "200", "500", "1000"})
      private int length;
  
      private List<Integer> numbers;
  
      @Setup
      public void prepare() {
          numbers = new ArrayList<>();
          for (int i = 0; i < length; i++) {
              numbers.add(ThreadLocalRandom.current().nextInt());
          }
      }
  
      private void doSomething() {
          Collections.shuffle(numbers);
          Collections.sort(numbers);
      }
  
      private void doSomethingWithEntry() {
          Entry e0 = null;
          try {
              e0 = SphU.entry("benchmark");
              doSomething();
          } catch (BlockException e) {
          } finally {
              if (e0 != null) {
                  e0.exit();
              }
          }
      }
  
      @Benchmark
      @Threads(1)
      public void testSingleThreadDirectly() {
          doSomething();
      }
  
      @Benchmark
      @Threads(1)
      public void testSingleThreadSingleEntry() {
          doSomethingWithEntry();
      }
  
      @Benchmark
      @Threads(2)
      public void test2ThreadsSingleEntry() {
          doSomethingWithEntry();
      }
  
      @Benchmark
      @Threads(3)
      public void test3ThreadsSingleEntry() {
          doSomethingWithEntry();
      }
  
      @Benchmark
      @Threads(4)
      public void test4ThreadsDirectly() {
          doSomething();
      }
  
      @Benchmark
      @Threads(4)
      public void test4ThreadsSingleEntry() {
          doSomethingWithEntry();
      }
  
      @Benchmark
      @Threads(8)
      public void test8ThreadsDirectly() {
          doSomething();
      }
  
      @Benchmark
      @Threads(8)
      public void test8ThreadsSingleEntry() {
          doSomethingWithEntry();
      }
  
      @Benchmark
      @Threads(16)
      public void test16ThreadsDirectly() {
          doSomething();
      }
  
      @Benchmark
      @Threads(16)
      public void test16ThreadsSingleEntry() {
          doSomethingWithEntry();
      }
  }
  