library/src/main/java/org/apache/apex/malhar/lib/dimensions/aggregator/AggregateEvent.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
 *
 *   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 org.apache.apex.malhar.lib.dimensions.aggregator;

import it.unimi.dsi.fastutil.Hash;

/**
 * @since 3.3.0
 */
public interface AggregateEvent
{
  int getAggregatorIndex();

  public static interface Aggregator<EVENT, AGGREGATE extends AggregateEvent> extends Hash.Strategy<EVENT>
  {
    AGGREGATE getGroup(EVENT src, int aggregatorIndex);

    void aggregate(AGGREGATE dest, EVENT src);

    void aggregate(AGGREGATE dest, AGGREGATE src);
  }
}