/*
    * Copyright (C) 2010 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.util.concurrent;
  
  import com.google.caliper.BeforeExperiment;
  import com.google.caliper.Benchmark;
  import com.google.caliper.Param;
  
  import java.lang.reflect.Constructor;
  import java.util.concurrent.BlockingQueue;
  
  /**
   * Benchmarks for {@link Monitor}.
   * 
   * @author Justin T. Sampson
   */
  public class MonitorBenchmark {
    
    @Param({"10", "100", "1000"}) int capacity;
    @Param({"Array", "Priority"}) String queueType;
    @Param boolean useMonitor;
    
    private BlockingQueue<String> queue;
    private String[] strings;
  
    @BeforeExperiment
    @SuppressWarnings("unchecked")
    void setUp() throws Exception {
      String prefix =
          (useMonitor ? "com.google.common.util.concurrent.MonitorBased" : "java.util.concurrent.");
      String className = prefix + queueType + "BlockingQueue";
      Constructor<?> constructor = Class.forName(className).getConstructor(int.class);
      queue = (BlockingQueue<String>) constructor.newInstance(capacity);
      
      strings = new String[capacity];
      for (int i = 0; i < capacity; i++) {
        strings[i] = String.valueOf(Math.random());
      }
    }
  
    @Benchmark void addsAndRemoves(int reps) {
      int capacity = this.capacity;
      BlockingQueue<String> queue = this.queue;
      String[] strings = this.strings;
      for (int i = 0; i < reps; i++) {
        for (int j = 0; j < capacity; j++) {
          queue.add(strings[j]);
        }
        for (int j = 0; j < capacity; j++) {
          queue.remove();
        }
      }
    }
  }