examples/src/main/java/examples/MessageDigestCreationBenchmark.java


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/*
 * Copyright (C) 2010 Google Inc.
 *
 * 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 examples;

import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;

import java.security.MessageDigest;

/**
 * Times creating new MessageDigest instances.
 */
public class MessageDigestCreationBenchmark extends SimpleBenchmark {
  // By default, just the "interesting ones". Also consider Adler32 and CRC32,
  // but these are not guaranteed to be supported in all runtime environments.
  @Param({"MD5", "SHA-1", "SHA-256", "SHA-512"})
  String algorithm;

  public void time(int reps) throws Exception {
    // Change this to use a dummy if the results look suspicious.
    for (int i = 0; i < reps; i++) {
      MessageDigest.getInstance(algorithm);
    }
  }

  public static void main(String[] args) throws Exception {
    Runner.main(MessageDigestCreationBenchmark.class, args);
  }
}