net.sf.ehcache.search.aggregator.Aggregator Maven / Gradle / Ivy
/**
* Copyright 2003-2010 Terracotta, Inc.
*
* Licensed 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 net.sf.ehcache.search.aggregator;
/**
* An Aggregator describes a requested aggregation for a query and provides aggregator instances for execution
*
* @author teck
*/
public interface Aggregator {
/**
* Create an instance of this aggregator. Every query execution will use a unique instance for requested aggregator
*
* @param
* @return aggregator instance
*/
AggregatorInstance createInstance();
}