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 io.ray.streaming.state.keystate.desc.ListStateDescriptor;
  import io.ray.streaming.state.keystate.state.ListState;
  import io.ray.streaming.state.keystate.state.impl.OperatorStateImpl;
  import io.ray.streaming.state.keystate.state.proxy.ListStateStoreManagerProxy;
  
  /** OperatorState manager for getting split or union list state. */
  public class OperatorStateBackend extends AbstractKeyStateBackend {
  
    public OperatorStateBackend(AbstractStateBackend backend) {
      super(backend);
    }
  
    @Override
    public void setCurrentKey(Object currentKey) {
      super.currentKey = currentKey;
    }
  
    protected <T> ListStateStoreManagerProxy<T> newListStateStoreManagerProxy(
        ListStateDescriptor<T> stateDescriptor) {
      return new ListStateStoreManagerProxy<>(this, stateDescriptor);
    }
  
    /** get spitted List for different operator instance. */
    public <T> ListState<T> getSplitListState(ListStateDescriptor<T> stateDescriptor) {
      String desc = stateDescriptor.getIdentify();
      if (listManagerProxyHashMap.containsKey(desc)) {
        ListStateStoreManagerProxy<T> listStateProxy = listManagerProxyHashMap.get(desc);
        return listStateProxy.getListState();
      } else {
        ListStateStoreManagerProxy<T> listStateProxy = newListStateStoreManagerProxy(stateDescriptor);
        listManagerProxyHashMap.put(desc, listStateProxy);
        ((OperatorStateImpl) (listStateProxy.getListState())).setSplit(true);
        return listStateProxy.getListState();
      }
    }
  
    /** get a union List for different operator instance. */
    public <T> ListState<T> getUnionListState(ListStateDescriptor<T> stateDescriptor) {
      String desc = stateDescriptor.getIdentify();
      if (listManagerProxyHashMap.containsKey(desc)) {
        ListStateStoreManagerProxy<T> listStateProxy = listManagerProxyHashMap.get(desc);
        return listStateProxy.getListState();
      } else {
        ListStateStoreManagerProxy<T> listStateProxy = newListStateStoreManagerProxy(stateDescriptor);
        listManagerProxyHashMap.put(desc, listStateProxy);
        ((OperatorStateImpl) (listStateProxy.getListState())).init();
        return listStateProxy.getListState();
      }
    }
  }
  