okio/jvm/jmh/src/jmh/java/com/squareup/okio/benchmarks/HashFunctionBenchmark.java

/*
 * Copyright (C) 2020 Square, Inc. and others.
 *
 * 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.squareup.okio.benchmarks;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.Main;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
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.Warmup;

@Fork(1)
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@State(Scope.Benchmark)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class HashFunctionBenchmark {

  MessageDigest jvm;

  @Param({ "100", "1048576" })
  public int messageSize;

  @Param({ "SHA-1", "SHA-256", "SHA-512", "MD5" })
  public String algorithm;

  private byte[] message;

  @Setup public void setup() throws NoSuchAlgorithmException {
    jvm = MessageDigest.getInstance(algorithm);
    message = new byte[messageSize];
  }

  @Benchmark public void jvm() {
    jvm.update(message, 0, messageSize);
    jvm.digest();
  }

  public static void main(String[] args) throws IOException {
    Main.main(new String[] { HashFunctionBenchmark.class.getName() });
  }
}