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 com.alibaba.jstorm.window;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import backtype.storm.task.TopologyContext;
  
  import com.alibaba.jstorm.transactional.state.IKvState;
  
  public class WindowedKvState<K, V> implements IKvState<K, V> {
      private static final long serialVersionUID = 310177555034652880L;
  
      private transient IKvWindowedState<K, V> windowedStateManager;
      private TimeWindow window;
      private Map<K, V> localBatch;
  
      public WindowedKvState() {
          
      }
  
      public WindowedKvState(TimeWindow window, IKvWindowedState<K, V> windowedStateManager) {
          this.windowedStateManager = windowedStateManager;
          this.localBatch = new HashMap<K, V>();
          this.window = window;   
      }
  
      public void setWindowedStateManager(IKvWindowedState<K, V> windowedStateManager) {
          this.windowedStateManager = windowedStateManager;
      }
  
      public void checkpointBatch() {
          windowedStateManager.putBatch(window, localBatch);
          clearLocalCache();
      }
  
      @Override
      public void init(TopologyContext context) {
          
      }
  
      @Override
      public void cleanup() {
          windowedStateManager.removeWindow(window);
      }
  
      @Override
      public void put(K key, V value) {
          localBatch.put(key, value);
      }
  
      @Override
      public V get(K key) {
          V value = localBatch.get(key);
          if (value == null) {
              value = windowedStateManager.get(window, key);
          }
          return value;
      }
  
      @Override
      public void putBatch(Map<K, V> batch) {
          localBatch.putAll(batch);
      }
  
      @Override
      public Map<K, V> getBatch(Collection<K> keys) {
          Map<K, V> batch = new HashMap<>();
          batch.putAll(windowedStateManager.getBatch(window, keys));
          for (K key : keys) {
              V value = batch.get(key);
              if (value != null)
                  batch.put(key, value);
          }
          return batch;
      }
  
      @Override
      public Collection<K> getAllKeys() {
          Set<K> keys = new HashSet<>();
          keys.addAll(localBatch.keySet());
          keys.addAll(windowedStateManager.getAllKeys(window));
          return keys;
      }
  
      @Override
      public Map<K, V> getBatch() {
          Map<K, V> ret = new HashMap<>();
          ret.putAll(windowedStateManager.getBatch(window));
          ret.putAll(localBatch);
          return ret;
      }
  
      @Override
      public void remove(K key) {
          this.remove(key);
      }
  
      @Override
      public void clear() {
          clearLocalCache();
          windowedStateManager.removeWindow(window);
      }
  
      private void clearLocalCache() {
          localBatch = new HashMap<>();
      }
  
      @Override
      public String toString() {
          return "[" + window.getStart() + ", " + window.getEnd() + ", Localcache=" + localBatch + "]";
      }
  }