| /** |
| * 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 java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.apex.malhar.lib.appdata.schemas.FieldsDescriptor; |
| import org.apache.apex.malhar.lib.appdata.schemas.Type; |
| import org.apache.apex.malhar.lib.dimensions.DimensionsEvent.Aggregate; |
| import org.apache.apex.malhar.lib.dimensions.DimensionsEvent.EventKey; |
| |
| /** |
| * @since 3.4.0 |
| */ |
| public interface CompositeAggregator |
| { |
| public int getSchemaID(); |
| |
| public int getDimensionDescriptorID(); |
| |
| public int getAggregatorID(); |
| |
| public Set<Integer> getEmbedAggregatorDdIds(); |
| |
| public Set<String> getFields(); |
| |
| public FieldsDescriptor getAggregateDescriptor(); |
| |
| public FieldsDescriptor getMetaDataDescriptor(); |
| |
| /** |
| * Returns the output type of the {@link CompositeAggregator}. <b>Note<b> that any combination of input types |
| * will produce the same output type for {@link CompositeAggregator}s. |
| * @return The output type of the {@link CompositeAggregator}. |
| */ |
| public Type getOutputType(); |
| |
| /** |
| * |
| * @param resultAggregate the aggregate to put the result |
| * @param inputEventKeys The input(incremental) event keys, used to locate the input aggregates |
| * @param inputAggregatesRepo: the map of the EventKey to Aggregate keep the super set of aggregate required |
| */ |
| public void aggregate(Aggregate resultAggregate, Set<EventKey> inputEventKeys, Map<EventKey, |
| Aggregate> inputAggregatesRepo); |
| } |