| /** |
| * 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 org.apache.storm.trident.windowing.strategy; |
| |
| import org.apache.storm.trident.windowing.config.WindowConfig; |
| import org.apache.storm.windowing.CountEvictionPolicy; |
| import org.apache.storm.windowing.CountTriggerPolicy; |
| import org.apache.storm.windowing.EvictionPolicy; |
| import org.apache.storm.windowing.TriggerHandler; |
| import org.apache.storm.windowing.TriggerPolicy; |
| |
| /** |
| * 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()); |
| } |
| } |