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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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 storm.trident.windowing.strategy;
  
  import backtype.storm.windowing.CountEvictionPolicy;
  import backtype.storm.windowing.CountTriggerPolicy;
  import backtype.storm.windowing.EvictionPolicy;
  import backtype.storm.windowing.TriggerHandler;
  import backtype.storm.windowing.TriggerPolicy;
  import storm.trident.windowing.config.WindowConfig;
  
  /**
   * This class represents tumbling window strategy based on the window count from the
   * given {@code slidingCountWindow} configuration. In this strategy , window and sliding lengths are equal.
   */
  public final class TumblingCountWindowStrategy<T> extends BaseWindowStrategy<T> {
  
      public TumblingCountWindowStrategy(WindowConfig tumblingCountWindow) {
          super(tumblingCountWindow);
      }
  
      /**
       * Returns a {@code TriggerPolicy} which triggers for every count of given sliding window.
       */
      @Override
      public TriggerPolicy<T> getTriggerPolicy(TriggerHandler triggerHandler, EvictionPolicy<T> evictionPolicy) {
          return new CountTriggerPolicy<>(windowConfig.getSlidingLength(), triggerHandler, evictionPolicy);
      }
  
      /**
       * Returns an {@code EvictionPolicy} instance which evicts elements after a count of given window length.
       */
      @Override
      public EvictionPolicy<T> getEvictionPolicy() {
          return new CountEvictionPolicy<>(windowConfig.getWindowLength());
      }
  }
  