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.apex.malhar.contrib.redis;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * This is a Redis output operator, which takes Maps as tuples and writes the key value pairs out to Redis.
   * <p>
   * This output adapter takes maps as tuples and just writes to the redis store with the keys and the values in the map
   * Note: Redis output operator should never use the passthrough method because it begins a transaction at beginWindow and commits a transaction at
   * endWindow, and a transaction in Redis blocks all other clients.
   * </p>
   *
   * @displayName Redis Map Output
   * @category Output
   * @tags redis, key value
   *
   * @param <K> The key type.
   * @param <V> The value type.
   * @since 0.3.2
   */
  public class RedisMapOutputOperator<K, V> extends AbstractRedisAggregateOutputOperator<Map<K, V>>
  {
    protected final Map<Object, Object> map = new HashMap<Object, Object>();
  
    @Override
    public void beginWindow(long windowId)
    {
      super.beginWindow(windowId);
      map.clear();
    }
  
    @Override
    public void processTuple(Map<K, V> t)
    {
      map.putAll(t);
    }
  
    @Override
    public void storeAggregate()
    {
      // RedisStore.putAll does not work for hash values
      for (Map.Entry<Object, Object> entry : map.entrySet()) {
        store.put(entry.getKey(), entry.getValue());
      }
    }
  
  }
  