| /* |
| * 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.apiary; |
| |
| import com.google.api.services.dataflow.model.MapTask; |
| import com.google.api.services.dataflow.model.MultiOutputInfo; |
| import com.google.api.services.dataflow.model.ParDoInstruction; |
| import com.google.api.services.dataflow.model.ParallelInstruction; |
| import java.util.List; |
| import java.util.function.Function; |
| import org.apache.beam.sdk.fn.IdGenerator; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableList; |
| |
| /** |
| * {@link ParDoInstruction}s are meant to always have {@link MultiOutputInfo}s which give names to |
| * the outputs. This function fixes {@link ParDoInstruction}s by filling in a default {@link |
| * MultiOutputInfo} with an output tag using the supplied id generator. Note that the id generator |
| * should supply ids outside the ids used within the {@link MapTask} to prevent collisions. |
| */ |
| public class FixMultiOutputInfosOnParDoInstructions implements Function<MapTask, MapTask> { |
| private final IdGenerator idGenerator; |
| |
| public FixMultiOutputInfosOnParDoInstructions(IdGenerator idGenerator) { |
| this.idGenerator = idGenerator; |
| } |
| |
| @Override |
| public MapTask apply(MapTask input) { |
| for (ParallelInstruction instruction : Apiary.listOrEmpty(input.getInstructions())) { |
| ParDoInstruction parDoInstruction = instruction.getParDo(); |
| if (parDoInstruction != null) { |
| int numOutputs = Apiary.intOrZero(parDoInstruction.getNumOutputs()); |
| List<MultiOutputInfo> multiOutputInfos = |
| Apiary.listOrEmpty(parDoInstruction.getMultiOutputInfos()); |
| if (numOutputs != Apiary.listOrEmpty(instruction.getParDo().getMultiOutputInfos()).size()) { |
| if (numOutputs == 1) { |
| parDoInstruction.setMultiOutputInfos( |
| ImmutableList.of(new MultiOutputInfo().setTag(idGenerator.getId()))); |
| } else { |
| throw new IllegalArgumentException( |
| String.format( |
| "Invalid ParDoInstruction %s, %d outputs specified, found %s tags.", |
| instruction.getSystemName(), numOutputs, multiOutputInfos)); |
| } |
| } |
| } |
| } |
| return input; |
| } |
| } |