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.stream.storage.impl.sc;
  
  import com.google.common.annotations.VisibleForTesting;
  import java.util.concurrent.ThreadLocalRandom;
  import org.apache.bookkeeper.stream.protocol.util.StorageContainerPlacementPolicy;
  
  /**
   * The default implementation of {@link StorageContainerPlacementPolicy}.
   */
  public class StorageContainerPlacementPolicyImpl implements StorageContainerPlacementPolicy {
  
      public static StorageContainerPlacementPolicyImpl of(int numStorageContainers) {
          return new StorageContainerPlacementPolicyImpl(numStorageContainers);
      }
  
      private final int numStorageContainers;
  
      private StorageContainerPlacementPolicyImpl(int numStorageContainers) {
          this.numStorageContainers = numStorageContainers;
      }
  
      @VisibleForTesting
      long getNumStorageContainers() {
          return numStorageContainers;
      }
  
      @Override
      public long placeStreamRange(long streamId, long rangeId) {
          return ThreadLocalRandom.current().nextInt(numStorageContainers);
      }
  }
  