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 io.ray.streaming.state.backend;
  
  import static io.ray.streaming.state.config.ConfigKey.DELIMITER;
  
  import io.ray.streaming.state.config.ConfigKey;
  import io.ray.streaming.state.keystate.desc.AbstractStateDescriptor;
  import io.ray.streaming.state.serialization.KeyMapStoreSerializer;
  import io.ray.streaming.state.store.KeyMapStore;
  import io.ray.streaming.state.store.KeyValueStore;
  import java.io.Serializable;
  import java.util.Map;
  
  /** This class is the abstract class for different kinds of StateBackend. */
  public abstract class AbstractStateBackend implements Serializable {
  
    protected final Map<String, String> config;
    protected final StateStrategy stateStrategy;
  
    protected final BackendType backendType;
    protected int keyGroupIndex = -1;
  
    protected AbstractStateBackend(Map<String, String> config) {
      this.stateStrategy = StateStrategy.getEnum(ConfigKey.getStateStrategyEnum(config));
      this.backendType = BackendType.getEnum(ConfigKey.getBackendType(config));
      this.config = config;
    }
  
    public abstract <K, V> KeyValueStore<K, V> getKeyValueStore(String tableName);
  
    public abstract <K, S, T> KeyMapStore<K, S, T> getKeyMapStore(String tableName);
  
    public abstract <K, S, T> KeyMapStore<K, S, T> getKeyMapStore(
        String tableName, KeyMapStoreSerializer keyMapStoreSerializer);
  
    public BackendType getBackendType() {
      return backendType;
    }
  
    public StateStrategy getStateStrategy() {
      return stateStrategy;
    }
  
    public String getTableName(AbstractStateDescriptor stateDescriptor) {
      return stateDescriptor.getTableName();
    }
  
    public String getStateKey(String descName, String currentKey) {
      return descName + DELIMITER + currentKey;
    }
  
    public void setKeyGroupIndex(int keyGroupIndex) {
      this.keyGroupIndex = keyGroupIndex;
    }
  }
  