1 /* 2 * Copyright (C) 2012 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.hash; 18 19 import com.google.caliper.BeforeExperiment; 20 import com.google.caliper.Benchmark; 21 import com.google.caliper.Param; 22 import java.security.MessageDigest; 23 24 /** 25 * Benchmarks for comparing instance creation of {@link MessageDigest}s. 26 * 27 * @author Kurt Alfred Kluever 28 */ 29 public class MessageDigestCreationBenchmark { 30 31 @Param({"MD5", "SHA-1", "SHA-256", "SHA-384", "SHA-512"}) 32 private String algorithm; 33 34 private MessageDigest md; 35 36 @BeforeExperiment setUp()37 void setUp() throws Exception { 38 md = MessageDigest.getInstance(algorithm); 39 } 40 41 @Benchmark getInstance(int reps)42 int getInstance(int reps) throws Exception { 43 int retValue = 0; 44 for (int i = 0; i < reps; i++) { 45 retValue ^= MessageDigest.getInstance(algorithm).getDigestLength(); 46 } 47 return retValue; 48 } 49 50 @Benchmark clone(int reps)51 int clone(int reps) throws Exception { 52 int retValue = 0; 53 for (int i = 0; i < reps; i++) { 54 retValue ^= ((MessageDigest) md.clone()).getDigestLength(); 55 } 56 return retValue; 57 } 58 } 59