content: /*
   * 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.bookkeeper.statelib;
  
  import java.util.function.Supplier;
  import lombok.AccessLevel;
  import lombok.NoArgsConstructor;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.common.annotation.InterfaceAudience.Public;
  import org.apache.bookkeeper.common.annotation.InterfaceStability.Evolving;
  import org.apache.bookkeeper.statelib.api.kv.KVAsyncStore;
  import org.apache.bookkeeper.statelib.api.kv.KVStore;
  import org.apache.bookkeeper.statelib.api.mvcc.MVCCAsyncStore;
  import org.apache.bookkeeper.statelib.impl.kv.RocksdbKVAsyncStore;
  import org.apache.bookkeeper.statelib.impl.kv.RocksdbKVStore;
  import org.apache.bookkeeper.statelib.impl.mvcc.MVCCStores;
  import org.apache.distributedlog.api.namespace.Namespace;
  
  /**
   * A central place for creating and managing state stores.
   */
  @Public
  @Evolving
  @Slf4j
  @NoArgsConstructor(access = AccessLevel.PRIVATE)
  public final class StateStores {
  
      /**
       * Returns a supplier that supplies simple kv store.
       *
       * @return a supplier that supplies simple kv store.
       */
      public static <K, V> Supplier<KVStore<K, V>> kvStoreSupplier() {
          return () ->
              new RocksdbKVStore<>();
      }
  
      /**
       * Returns a supplier that supplies simple kv async store.
       *
       * @param logNamespaceSupplier log namespace supplier
       * @return a supplier that supplies simple kv store.
       */
      public static <K, V> Supplier<KVAsyncStore<K, V>> kvAsyncStoreSupplier(Supplier<Namespace> logNamespaceSupplier) {
          return () ->
              new RocksdbKVAsyncStore<>(() -> new RocksdbKVStore<>(), logNamespaceSupplier);
      }
  
      /**
       * Returns a supplier that supplies mvcc bytes store.
       *
       * @param nsSupplier namespace supplier
       * @return a supplier that supplies mvcc bytes store.
       */
      public static Supplier<MVCCAsyncStore<byte[], byte[]>> mvccKvBytesStoreSupplier(Supplier<Namespace> nsSupplier) {
          return MVCCStores.bytesStoreSupplier(nsSupplier);
      }
  
  }
  