/*
    * Copyright (C) 2012 The Guava Authors
    *
    * 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.google.common.collect;
  
  import com.google.caliper.BeforeExperiment;
  import com.google.caliper.Benchmark;
  import com.google.caliper.Param;
  import com.google.common.collect.BenchmarkHelpers.SetImpl;
  
  /**
   * This is meant to be used with {@code --measureMemory} to measure the memory
   * usage of various {@code Set} implementations.
   * 
   * @author Christopher Swenson
   */
  public class SetCreationBenchmark {
    @Param({ "3", "6", "11", "23", "45", "91", "181", "362", "724", "1448",
        "2896", "5793", "11585", "23170", "46341", "92682", "185364", "370728",
        "741455", "1482910", "2965821", "5931642"})
    private int size;
    
    // "" means no fixed seed
    @Param("1234")
    private SpecialRandom random;
    
    @Param({"Immutable", "Hash"})
    private SetImpl impl;
    
    // the following must be set during setUp
    private CollectionBenchmarkSampleData sampleData;
    
    @BeforeExperiment void setUp() {
      sampleData = new CollectionBenchmarkSampleData(true, random, 0.8, size);
    }
    
    @Benchmark int creation(int reps) {
      int x = 0;
      for (int i = 0; i < reps; i++) {
        x ^= System.identityHashCode(impl.create(sampleData.getValuesInSet()));
      }
      return x;
    }
  }