content: /*
   * 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 org.apache.bookkeeper.common.router;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  
  import com.google.common.hash.Hashing;
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.common.hash.Murmur3;
  import org.junit.Test;
  
  /**
   * Unit test {@link HashRouter}s.
   */
  @Slf4j
  public class HashRouterTest {
  
      @Test
      public void testByteBufHashRouter() {
          byte[] keyBytes = "foo".getBytes(UTF_8);
          ByteBuf key = Unpooled.wrappedBuffer(keyBytes);
  
          // murmur3 - 32 bits
          int hash32 = Murmur3.hash32(
              key, key.readerIndex(), key.readableBytes(), (int) AbstractHashRouter.HASH_SEED);
          int bytesHash32 = Murmur3.hash32(keyBytes, 0, keyBytes.length, (int) AbstractHashRouter.HASH_SEED);
          int guavaHash32 = Hashing.murmur3_32_fixed((int) AbstractHashRouter.HASH_SEED)
              .newHasher()
              .putString("foo", UTF_8)
              .hash()
              .asInt();
          assertEquals(hash32, bytesHash32);
          assertEquals(hash32, guavaHash32);
  
          // murmur3 - 128 bits
          long[] hash128 = Murmur3.hash128(
              key, key.readerIndex(), key.readableBytes(), AbstractHashRouter.HASH_SEED);
          long[] bytesHash128 = Murmur3.hash128(keyBytes, 0, keyBytes.length, AbstractHashRouter.HASH_SEED);
          log.info("hash128: {}, bytes hash128: {}", hash128, bytesHash128);
          long guavaHash128 = Hashing.murmur3_128((int) AbstractHashRouter.HASH_SEED)
              .newHasher()
              .putString("foo", UTF_8)
              .hash()
              .asLong();
          assertArrayEquals(hash128, bytesHash128);
          assertEquals(hash128[0], guavaHash128);
  
          ByteBufHashRouter router = ByteBufHashRouter.of();
          long routingHash = router.getRoutingKey(key);
          log.info("Routing hash = {}", routingHash);
          assertEquals(hash128[0], routingHash);
          BytesHashRouter bytesRouter = BytesHashRouter.of();
          long bytesRoutingHash = bytesRouter.getRoutingKey(keyBytes);
          assertEquals(hash128[0], bytesRoutingHash);
      }
  
  }
  