WindowStrategy.java

/**
 * 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.EvictionPolicy;
import backtype.storm.windowing.TriggerHandler;
import backtype.storm.windowing.TriggerPolicy;

/**
 * Strategy for windowing which will have respective trigger and eviction policies.
 */
public interface WindowStrategy<T> {

    /**
     * Returns a {@code TriggerPolicy}  by creating with {@code triggerHandler} and {@code evictionPolicy} with
     * the given configuration.
     */
    TriggerPolicy<T> getTriggerPolicy(TriggerHandler triggerHandler, EvictionPolicy<T> evictionPolicy);

    /**
     * Returns an {@code EvictionPolicy} instance for this strategy with the given configuration.
     */
    EvictionPolicy<T> getEvictionPolicy();
}