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An efficient event correlation library

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/**
 * Copyright 2016 Symantec Corporation.
 * 
 * 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 io.symcpe.wraith.aggregators;

/**
 * {@link Aggregator} interface for counting
 * 
 * @author ambud_sharma
 */
public interface CountingAggregator extends Aggregator {
	
	/**
	 * @return cardinality
	 */
	public long getCardinality();

	/**
	 * Self factory, to create a brand new {@link CountingAggregator} instance
	 * with the same configuration
	 * @return
	 */
	public CountingAggregator getInstance();
	
}