/*
    * 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
    *
    *      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 org.apache.commons.io.jmh;
  
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.commons.io.input.QueueInputStream;
  import org.apache.commons.io.output.QueueOutputStream;
  import org.apache.commons.lang3.RandomUtils;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Group;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.infra.Blackhole;
  
  /**
   * Measures the amount of time to push 1 MiB to a {@link QueueOutputStream} and read it using a {@link QueueInputStream}
   */
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  @State(Scope.Group)
  public class QueueStreamBenchmark {
  
      private static final int CAPACITY = 1024 * 1024;
      private static final int BUFFER_SIZE = 1024;
  
      private final BlockingQueue<Integer> queue = new LinkedBlockingQueue<>(CAPACITY);
      private final QueueInputStream inputStream = QueueInputStream.builder()
              .setBlockingQueue(queue)
              .get();
      private final QueueOutputStream outputStream = inputStream.newQueueOutputStream();
  
      private final byte[] input = RandomUtils.insecure().randomBytes(CAPACITY);
      private final byte[] output = new byte[BUFFER_SIZE];
  
      @Benchmark
      @Group("streams")
      public void input(final Blackhole bh) throws Exception {
          int received = 0;
          while (received < CAPACITY) {
              final int len = inputStream.read(output, 0, BUFFER_SIZE);
              bh.consume(output);
              received += len;
          }
      }
  
      @Benchmark
      @Group("streams")
      public void output() throws Exception {
          int sent = 0;
          while (sent < CAPACITY) {
              final int len = Math.min(CAPACITY - sent, BUFFER_SIZE);
              outputStream.write(input, sent, len);
              sent += len;
          }
      }
  }