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Diffstat (limited to 'guava-tests/benchmark/com/google/common/hash/MessageDigestAlgorithmBenchmark.java')
-rw-r--r-- | guava-tests/benchmark/com/google/common/hash/MessageDigestAlgorithmBenchmark.java | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/guava-tests/benchmark/com/google/common/hash/MessageDigestAlgorithmBenchmark.java b/guava-tests/benchmark/com/google/common/hash/MessageDigestAlgorithmBenchmark.java deleted file mode 100644 index bef6e63..0000000 --- a/guava-tests/benchmark/com/google/common/hash/MessageDigestAlgorithmBenchmark.java +++ /dev/null @@ -1,111 +0,0 @@ -/* - * Copyright (C) 2012 The Guava Authors - * - * 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.google.common.hash; - -import com.google.caliper.Param; -import com.google.caliper.Runner; -import com.google.caliper.SimpleBenchmark; -import com.google.common.hash.HashFunction; -import com.google.common.hash.Hashing; - -import java.security.MessageDigest; -import java.security.NoSuchAlgorithmException; - -import java.util.Random; - -/** - * Benchmarks for comparing {@link MessageDigest}s and {@link HashFunction}s that wrap - * {@link MessageDigest}s. - * - * <p>Parameters for the benchmark are: - * <ul> - * <li>size: The length of the byte array to hash. - * <li>algorithm: the algorithm to hash with (e.g. MD5, SHA1, etc.). - * <li>hashMethod: how to hash the data (using the Hashing API or the MessageDigest API). - * </ul> - * - * @author Kurt Alfred Kluever - */ -public class MessageDigestAlgorithmBenchmark extends SimpleBenchmark { - @Param({"10", "1000", "100000", "1000000"}) int size; - @Param Algorithm algorithm; - @Param HashMethod hashMethod; - - private enum HashMethod { - MESSAGE_DIGEST_API() { - @Override public byte[] hash(Algorithm algorithm, byte[] input) { - MessageDigest md = algorithm.getMessageDigest(); - md.update(input); - return md.digest(); - } - }, - HASH_FUNCTION_API() { - @Override public byte[] hash(Algorithm algorithm, byte[] input) { - return algorithm.getHashFunction().hashBytes(input).asBytes(); - } - }; - public abstract byte[] hash(Algorithm algorithm, byte[] input); - } - - private enum Algorithm { - MD5("MD5", Hashing.md5()), - SHA_1("SHA-1", Hashing.sha1()), - SHA_256("SHA-256", Hashing.sha256()), - SHA_512("SHA-512", Hashing.sha512()); - - private final String algorithmName; - private final HashFunction hashFn; - Algorithm(String algorithmName, HashFunction hashFn) { - this.algorithmName = algorithmName; - this.hashFn = hashFn; - } - public MessageDigest getMessageDigest() { - try { - return MessageDigest.getInstance(algorithmName); - } catch (NoSuchAlgorithmException e) { - throw new AssertionError(e); - } - } - public HashFunction getHashFunction() { - return hashFn; - } - } - - // Use a constant seed for all of the benchmarks to ensure apples to apples comparisons. - private static final int RANDOM_SEED = new Random().nextInt(); - - private byte[] testBytes; - - @Override public void setUp() { - testBytes = new byte[size]; - new Random(RANDOM_SEED).nextBytes(testBytes); - } - - public byte timeHashing(int reps) { - byte result = 0x01; - HashMethod hashMethod = this.hashMethod; - Algorithm algorithm = this.algorithm; - for (int i = 0; i < reps; i++) { - result ^= hashMethod.hash(algorithm, testBytes)[0]; - } - return result; - } - - public static void main(String[] args) { - Runner.main(MessageDigestAlgorithmBenchmark.class, args); - } -} |