| /** |
| * 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.hadoop.io; |
| |
| import org.apache.hadoop.io.TestWritable; |
| import junit.framework.TestCase; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.security.MessageDigest; |
| import java.util.Random; |
| |
| /** Unit tests for MD5Hash. */ |
| public class TestMD5Hash extends TestCase { |
| public TestMD5Hash(String name) { super(name); } |
| |
| private static final Random RANDOM = new Random(); |
| |
| public static MD5Hash getTestHash() throws Exception { |
| MessageDigest digest = MessageDigest.getInstance("MD5"); |
| byte[] buffer = new byte[1024]; |
| RANDOM.nextBytes(buffer); |
| digest.update(buffer); |
| return new MD5Hash(digest.digest()); |
| } |
| |
| protected static byte[] D00 = new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; |
| protected static byte[] DFF = new byte[] {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}; |
| |
| public void testMD5Hash() throws Exception { |
| MD5Hash md5Hash = getTestHash(); |
| |
| final MD5Hash md5Hash00 |
| = new MD5Hash(D00); |
| |
| final MD5Hash md5HashFF |
| = new MD5Hash(DFF); |
| |
| MD5Hash orderedHash = new MD5Hash(new byte[]{1,2,3,4,5,6,7,8,9,10,11,12, |
| 13,14,15,16}); |
| MD5Hash backwardHash = new MD5Hash(new byte[]{-1,-2,-3,-4,-5,-6,-7,-8, |
| -9,-10,-11,-12, -13, -14, |
| -15,-16}); |
| MD5Hash closeHash1 = new MD5Hash(new byte[]{-1,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0}); |
| MD5Hash closeHash2 = new MD5Hash(new byte[]{-1,1,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0}); |
| |
| // test i/o |
| TestWritable.testWritable(md5Hash); |
| TestWritable.testWritable(md5Hash00); |
| TestWritable.testWritable(md5HashFF); |
| |
| // test equals() |
| assertEquals(md5Hash, md5Hash); |
| assertEquals(md5Hash00, md5Hash00); |
| assertEquals(md5HashFF, md5HashFF); |
| |
| // test compareTo() |
| assertTrue(md5Hash.compareTo(md5Hash) == 0); |
| assertTrue(md5Hash00.compareTo(md5Hash) < 0); |
| assertTrue(md5HashFF.compareTo(md5Hash) > 0); |
| |
| // test toString and string ctor |
| assertEquals(md5Hash, new MD5Hash(md5Hash.toString())); |
| assertEquals(md5Hash00, new MD5Hash(md5Hash00.toString())); |
| assertEquals(md5HashFF, new MD5Hash(md5HashFF.toString())); |
| |
| assertEquals(0x01020304, orderedHash.quarterDigest()); |
| assertEquals(0xfffefdfc, backwardHash.quarterDigest()); |
| |
| assertEquals(0x0102030405060708L, orderedHash.halfDigest()); |
| assertEquals(0xfffefdfcfbfaf9f8L, backwardHash.halfDigest()); |
| assertTrue("hash collision", |
| closeHash1.hashCode() != closeHash2.hashCode()); |
| |
| Thread t1 = new Thread() { |
| public void run() { |
| for (int i = 0; i < 100; i++) { |
| MD5Hash hash = new MD5Hash(DFF); |
| assertEquals(hash, md5HashFF); |
| } |
| } |
| }; |
| |
| Thread t2 = new Thread() { |
| public void run() { |
| for (int i = 0; i < 100; i++) { |
| MD5Hash hash = new MD5Hash(D00); |
| assertEquals(hash, md5Hash00); |
| } |
| } |
| }; |
| |
| t1.start(); |
| t2.start(); |
| t1.join(); |
| t2.join(); |
| } |
| |
| public void testFactoryReturnsClearedHashes() throws IOException { |
| // A stream that will throw an IOE after reading some bytes |
| ByteArrayInputStream failingStream = new ByteArrayInputStream( |
| "xxxx".getBytes()) { |
| @Override |
| public synchronized int read(byte[] b) throws IOException { |
| int ret = super.read(b); |
| if (ret <= 0) { |
| throw new IOException("Injected fault"); |
| } |
| return ret; |
| } |
| }; |
| final String TEST_STRING = "hello"; |
| |
| // Calculate the correct digest for the test string |
| MD5Hash expectedHash = MD5Hash.digest(TEST_STRING); |
| |
| // Hashing again should give the same result |
| assertEquals(expectedHash, MD5Hash.digest(TEST_STRING)); |
| |
| // Try to hash a stream which will fail halfway through |
| try { |
| MD5Hash.digest(failingStream); |
| fail("didnt throw!"); |
| } catch (Exception e) { |
| // expected |
| } |
| |
| // Make sure we get the same result |
| assertEquals(expectedHash, MD5Hash.digest(TEST_STRING)); |
| } |
| } |