code: /*
   * SPDX-License-Identifier: Apache-2.0
   * Copyright 2018-2020 The Feast Authors
   *
   * 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
   *
   *     https://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 feast.serving.connectors.redis.retriever;
  
  import io.lettuce.core.KeyValue;
  import io.lettuce.core.RedisFuture;
  import io.lettuce.core.RedisURI;
  import io.lettuce.core.api.StatefulRedisConnection;
  import io.lettuce.core.api.async.RedisAsyncCommands;
  import io.lettuce.core.codec.ByteArrayCodec;
  import java.util.List;
  import java.util.Map;
  
  public class RedisClient implements RedisClientAdapter {
  
    private final RedisAsyncCommands<byte[], byte[]> asyncCommands;
  
    @Override
    public RedisFuture<List<KeyValue<byte[], byte[]>>> hmget(byte[] key, byte[]... fields) {
      return asyncCommands.hmget(key, fields);
    }
  
    @Override
    public RedisFuture<Map<byte[], byte[]>> hgetall(byte[] key) {
      return asyncCommands.hgetall(key);
    }
  
    @Override
    public void flushCommands() {
      asyncCommands.flushCommands();
    }
  
    private RedisClient(StatefulRedisConnection<byte[], byte[]> connection) {
      this.asyncCommands = connection.async();
    }
  
    public static RedisClientAdapter create(RedisStoreConfig config) {
  
      RedisURI uri = RedisURI.create(config.getHost(), config.getPort());
  
      if (config.getSsl()) {
        uri.setSsl(true);
      }
  
      if (!config.getPassword().isEmpty()) {
        uri.setPassword(config.getPassword());
      }
  
      StatefulRedisConnection<byte[], byte[]> connection =
          io.lettuce.core.RedisClient.create(uri).connect(new ByteArrayCodec());
  
      return new RedisClient(connection);
    }
  }
  