content: /**
   * 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
   *
   *     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 org.apache.cassandra.test.microbench;
  
  import org.apache.cassandra.io.util.BufferedDataOutputStreamPlus;
  import org.apache.cassandra.io.util.BufferedDataOutputStreamTest;
  import org.apache.cassandra.io.util.WrappedDataOutputStreamPlus;
  import org.openjdk.jmh.annotations.*;
  import org.openjdk.jmh.infra.Blackhole;
  
  import java.io.BufferedOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.nio.channels.WritableByteChannel;
  import java.util.concurrent.TimeUnit;
  
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  @Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
  @Fork(value = 3, jvmArgsAppend = "-Xmx512M")
  @Threads(1)
  @State(Scope.Benchmark)
  public class OutputStreamBench
  {
  
      BufferedOutputStream hole;
  
      WrappedDataOutputStreamPlus streamA;
  
      BufferedDataOutputStreamPlus streamB;
  
      byte foo;
  
      int foo1;
  
      long foo2;
  
      double foo3;
  
      float foo4;
  
      short foo5;
  
      char foo6;
  
  
      String tinyM = BufferedDataOutputStreamTest.fourByte;
      String smallM;
      String largeM;
      String tiny = "a";
      String small = "adsjglhnafsjk;gujfakyhgukafshgjkahfsgjkhafs;jkhausjkgaksfj;gafskdghajfsk;g";
      String large;
  
      @Setup
      public void setUp(final Blackhole bh) {
          StringBuilder sb = new StringBuilder();
          for (int ii = 0; ii < 11; ii++) {
              sb.append(BufferedDataOutputStreamTest.fourByte);
              sb.append(BufferedDataOutputStreamTest.threeByte);
              sb.append(BufferedDataOutputStreamTest.twoByte);
          }
          smallM = sb.toString();
              
          sb = new StringBuilder();
          while (sb.length() < 1024 * 12) {
              sb.append(small);
          }
          large = sb.toString();
  
          sb = new StringBuilder();
          while (sb.length() < 1024 * 12) {
              sb.append(smallM);
          }
          largeM = sb.toString();
  
          hole = new BufferedOutputStream(new OutputStream() {
  
              @Override
              public void write(int b) throws IOException
              {
                  bh.consume(b);
              }
  
              @Override
              public void write(byte b[]) throws IOException {
                  bh.consume(b);
              }
  
              @Override
              public void write(byte b[], int a, int c) throws IOException {
                  bh.consume(b);
                  bh.consume(a);
                  bh.consume(c);
              }
              });
  
          streamA = new WrappedDataOutputStreamPlus(hole);
  
          streamB = new BufferedDataOutputStreamPlus(new WritableByteChannel() {
  
              @Override
              public boolean isOpen()
              {
                  return true;
              }
  
              @Override
              public void close() throws IOException
              {
              }
  
              @Override
              public int write(ByteBuffer src) throws IOException
              {
                  bh.consume(src);
                  int remaining = src.remaining();
                  src.position(src.limit());
                  return remaining;
              }
  
          }, 8192);
      }
  
      @Benchmark
      public void testBOSByte() throws IOException
      {
          streamA.write(foo);
      }
  
      @Benchmark
      public void testBDOSPByte() throws IOException
      {
          streamB.write(foo);
      }
  
      @Benchmark
      public void testBOSInt() throws IOException
      {
          streamA.writeInt(foo1);
      }
  
      @Benchmark
      public void testBDOSPInt() throws IOException
      {
          streamB.writeInt(foo1);
      }
  
      @Benchmark
      public void testBOSLong() throws IOException
      {
          streamA.writeLong(foo2);
      }
  
      @Benchmark
      public void testBDOSPLong() throws IOException
      {
          streamB.writeLong(foo2);
      }
  
      @Benchmark
      public void testBOSMixed() throws IOException
      {
          streamA.write(foo);
          streamA.writeInt(foo1);
          streamA.writeLong(foo2);
          streamA.writeDouble(foo3);
          streamA.writeFloat(foo4);
          streamA.writeShort(foo5);
          streamA.writeChar(foo6);
      }
  
      @Benchmark
      public void testBDOSPMixed() throws IOException
      {
          streamB.write(foo);
          streamB.writeInt(foo1);
          streamB.writeLong(foo2);
          streamB.writeDouble(foo3);
          streamB.writeFloat(foo4);
          streamB.writeShort(foo5);
          streamB.writeChar(foo6);
      }
  
      @Benchmark
      public void testMTinyStringBOS() throws IOException {
          streamA.writeUTF(tinyM);
      }
  
      @Benchmark
      public void testMTinyStringBDOSP() throws IOException {
          streamB.writeUTF(tinyM);
      }
  
      @Benchmark
      public void testMTinyLegacyWriteUTF() throws IOException {
          BufferedDataOutputStreamTest.writeUTFLegacy(tinyM, hole);
      }
  
      @Benchmark
      public void testMSmallStringBOS() throws IOException {
          streamA.writeUTF(smallM);
      }
  
      @Benchmark
      public void testMSmallStringBDOSP() throws IOException {
          streamB.writeUTF(smallM);
      }
  
      @Benchmark
      public void testMSmallLegacyWriteUTF() throws IOException {
          BufferedDataOutputStreamTest.writeUTFLegacy(smallM, hole);
      }
  
      @Benchmark
      public void testMLargeStringBOS() throws IOException {
          streamA.writeUTF(largeM);
      }
  
      @Benchmark
      public void testMLargeStringBDOSP() throws IOException {
          streamB.writeUTF(largeM);
      }
  
      @Benchmark
      public void testMLargeLegacyWriteUTF() throws IOException {
          BufferedDataOutputStreamTest.writeUTFLegacy(largeM, hole);
      }
  
      @Benchmark
      public void testTinyStringBOS() throws IOException {
          streamA.writeUTF(tiny);
      }
  
      @Benchmark
      public void testTinyStringBDOSP() throws IOException {
          streamB.writeUTF(tiny);
      }
  
      @Benchmark
      public void testTinyLegacyWriteUTF() throws IOException {
          BufferedDataOutputStreamTest.writeUTFLegacy(tiny, hole);
      }
  
      @Benchmark
      public void testSmallStringBOS() throws IOException {
          streamA.writeUTF(small);
      }
  
      @Benchmark
      public void testSmallStringBDOSP() throws IOException {
          streamB.writeUTF(small);
      }
  
      @Benchmark
      public void testSmallLegacyWriteUTF() throws IOException {
          BufferedDataOutputStreamTest.writeUTFLegacy(small, hole);
      }
  
      @Benchmark
      public void testRLargeStringBOS() throws IOException {
          streamA.writeUTF(large);
      }
  
      @Benchmark
      public void testRLargeStringBDOSP() throws IOException {
          streamB.writeUTF(large);
      }
  
      @Benchmark
      public void testRLargeLegacyWriteUTF() throws IOException {
          BufferedDataOutputStreamTest.writeUTFLegacy(large, hole);
      }
  }
  