| /* |
| * 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.beam.runners.dataflow.worker.counters; |
| |
| import com.google.api.services.dataflow.model.CounterUpdate; |
| import com.google.common.collect.ImmutableMap; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.beam.runners.dataflow.worker.MetricsToCounterUpdateConverter.Kind; |
| |
| public class CounterUpdateAggregators { |
| |
| private static final Map<String, CounterUpdateAggregator> aggregators = |
| ImmutableMap.of( |
| Kind.SUM.toString(), new SumCounterUpdateAggregator(), |
| Kind.MEAN.toString(), new MeanCounterUpdateAggregator(), |
| Kind.DISTRIBUTION.toString(), new DistributionCounterUpdateAggregator()); |
| |
| private static String getCounterUpdateKind(CounterUpdate counterUpdate) { |
| if (counterUpdate.getStructuredNameAndMetadata() != null |
| && counterUpdate.getStructuredNameAndMetadata().getMetadata() != null) { |
| return counterUpdate.getStructuredNameAndMetadata().getMetadata().getKind(); |
| } |
| if (counterUpdate.getNameAndKind() != null) { |
| return counterUpdate.getNameAndKind().getKind(); |
| } |
| throw new IllegalArgumentException( |
| "CounterUpdate must have either StructuredNameAndMetadata or NameAndKind."); |
| } |
| |
| /** |
| * Try to aggregate a List of CounterUpdates. The first CounterUpdate entry of the List will be |
| * examined to identify the CounterUpdate kind with {@link #getCounterUpdateKind(CounterUpdate)} |
| * and find the suitable {@link CounterUpdateAggregator}, if there is no suitable aggregator the |
| * original list will be returned. |
| * |
| * <p>Note that this method assumes the CounterUpdate elements in this list has the same {@link |
| * com.google.api.services.dataflow.model.CounterStructuredNameAndMetadata |
| * StructruredNameAndMetadata} or {@link com.google.api.services.dataflow.model.NameAndKind |
| * NameAndKind}, also the value type should be the same across all the elements. |
| * |
| * @param counterUpdates List of CounterUpdate to be aggregated. |
| * @return A singleton list of combined CounterUpdate if it is possible to aggregate the elements, |
| * other wise return the original list. |
| */ |
| public static List<CounterUpdate> aggregate(List<CounterUpdate> counterUpdates) { |
| if (counterUpdates == null || counterUpdates.isEmpty()) { |
| return counterUpdates; |
| } |
| CounterUpdate first = counterUpdates.get(0); |
| String kind = getCounterUpdateKind(first); |
| if (aggregators.containsKey(kind)) { |
| // Return list containing combined CounterUpdate |
| return Collections.singletonList(aggregators.get(kind).aggregate(counterUpdates)); |
| } |
| // not able to aggregate the counter updates. |
| return counterUpdates; |
| } |
| } |