/*
* 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 io.airlift.slice;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import org.testng.annotations.Test;
import java.util.concurrent.ThreadLocalRandom;
import static org.testng.Assert.assertEquals;
public class TestMurmur3
{
@Test(invocationCount = 100)
public void testLessThan16Bytes()
throws Exception
{
byte[] data = randomBytes(ThreadLocalRandom.current().nextInt(16));
HashCode expected = Hashing.murmur3_128().hashBytes(data);
Slice actual = Murmur3.hash(Slices.wrappedBuffer(data));
assertEquals(actual.getBytes(), expected.asBytes());
}
@Test(invocationCount = 100)
public void testMoreThan16Bytes()
throws Exception
{
byte[] data = randomBytes(131);
HashCode expected = Hashing.murmur3_128().hashBytes(data);
Slice actual = Murmur3.hash(Slices.wrappedBuffer(data));
assertEquals(actual.getBytes(), expected.asBytes());
}
@Test(invocationCount = 100)
public void testOffsetAndLength()
throws Exception
{
byte[] data = randomBytes(131);
int offset = 13;
int length = 55;
HashCode expected = Hashing.murmur3_128().hashBytes(data, offset, length);
Slice actual = Murmur3.hash(Slices.wrappedBuffer(data), offset, length);
assertEquals(actual.getBytes(), expected.asBytes());
}
@Test(invocationCount = 100)
public void testNonDefaultSeed()
throws Exception
{
byte[] data = randomBytes(131);
int seed = 123456789;
HashCode expected = Hashing.murmur3_128(seed).hashBytes(data);
Slice actual = Murmur3.hash(seed, Slices.wrappedBuffer(data), 0, data.length);
assertEquals(actual.getBytes(), expected.asBytes());
}
@Test
public void testTail()
throws Exception
{
for (int i = 0; i < 16; i++) {
byte[] data = randomBytes(50 + i);
HashCode expected = Hashing.murmur3_128().hashBytes(data);
Slice actual = Murmur3.hash(Slices.wrappedBuffer(data));
assertEquals(actual.getBytes(), expected.asBytes());
}
}
@Test(invocationCount = 100)
public void testLessThan16Bytes64()
throws Exception
{
byte[] data = randomBytes(ThreadLocalRandom.current().nextInt(16));
long expected = Murmur3.hash(Slices.wrappedBuffer(data)).getLong(0);
long actual = Murmur3.hash64(Slices.wrappedBuffer(data));
assertEquals(actual, expected);
}
@Test(invocationCount = 100)
public void testMoreThan16Bytes64()
throws Exception
{
byte[] data = randomBytes(131);
long expected = Murmur3.hash(Slices.wrappedBuffer(data)).getLong(0);
long actual = Murmur3.hash64(Slices.wrappedBuffer(data));
assertEquals(actual, expected);
}
@Test(invocationCount = 100)
public void testOffsetAndLength64()
throws Exception
{
byte[] data = randomBytes(131);
int offset = 13;
int length = 55;
long expected = Murmur3.hash(Slices.wrappedBuffer(data), offset, length).getLong(0);
long actual = Murmur3.hash64(Slices.wrappedBuffer(data), offset, length);
assertEquals(actual, expected);
}
@Test(invocationCount = 100)
public void testNonDefaultSeed64()
throws Exception
{
byte[] data = randomBytes(131);
int seed = 123456789;
long expected = Murmur3.hash(seed, Slices.wrappedBuffer(data), 0, data.length).getLong(0);
long actual = Murmur3.hash64(seed, Slices.wrappedBuffer(data), 0, data.length);
assertEquals(actual, expected);
}
@Test
public void testTail64()
throws Exception
{
for (int i = 0; i < 16; i++) {
byte[] data = randomBytes(50 + i);
long expected = Murmur3.hash(Slices.wrappedBuffer(data)).getLong(0);
long actual = Murmur3.hash64(Slices.wrappedBuffer(data));
assertEquals(actual, expected);
}
}
@Test(invocationCount = 100)
public void test64ReturnsMsb()
throws Exception
{
byte[] data = randomBytes(ThreadLocalRandom.current().nextInt(200));
long expected = Murmur3.hash(Slices.wrappedBuffer(data)).getLong(0);
long actual = Murmur3.hash64(Slices.wrappedBuffer(data));
assertEquals(actual, expected);
}
@Test(invocationCount = 100)
public void testSingleLong()
throws Exception
{
long value = ThreadLocalRandom.current().nextLong();
Slice slice = Slices.allocate(8);
slice.setLong(0, value);
long expected = Murmur3.hash64(slice);
long actual = Murmur3.hash64(value);
assertEquals(actual, expected);
}
private static byte[] randomBytes(int length)
{
byte[] result = new byte[length];
ThreadLocalRandom.current().nextBytes(result);
return result;
}
}