| /* |
| * 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.twister2.translators.batch; |
| |
| import edu.iu.dsc.tws.api.tset.sets.TSet; |
| import edu.iu.dsc.tws.tset.env.BatchTSetEnvironment; |
| import edu.iu.dsc.tws.tset.env.TSetEnvironment; |
| import edu.iu.dsc.tws.tset.sets.batch.BatchTSetImpl; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import org.apache.beam.runners.twister2.Twister2BatchTranslationContext; |
| import org.apache.beam.runners.twister2.translation.wrappers.Twister2EmptySource; |
| import org.apache.beam.runners.twister2.translators.BatchTransformTranslator; |
| import org.apache.beam.sdk.transforms.Flatten; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.PValue; |
| |
| /** Flatten translator. */ |
| @SuppressWarnings({ |
| "rawtypes" // TODO(https://issues.apache.org/jira/browse/BEAM-10556) |
| }) |
| public class FlattenTranslatorBatch<T> |
| implements BatchTransformTranslator<Flatten.PCollections<T>> { |
| @Override |
| public void translateNode( |
| Flatten.PCollections<T> transform, Twister2BatchTranslationContext context) { |
| Collection<PCollection<?>> pcs = context.getInputs().values(); |
| List<BatchTSetImpl<WindowedValue<T>>> tSets = new ArrayList<>(); |
| BatchTSetImpl<WindowedValue<T>> unionTSet; |
| |
| if (pcs.isEmpty()) { |
| final TSetEnvironment tsetEnv = context.getEnvironment(); |
| unionTSet = |
| ((BatchTSetEnvironment) tsetEnv) |
| .createSource(new Twister2EmptySource(), context.getOptions().getParallelism()); |
| } else { |
| for (PValue pc : pcs) { |
| BatchTSetImpl<WindowedValue<T>> curr = context.getInputDataSet(pc); |
| tSets.add(curr); |
| } |
| |
| BatchTSetImpl<WindowedValue<T>> first = tSets.remove(0); |
| Collection<TSet<WindowedValue<T>>> others = new ArrayList<>(); |
| others.addAll(tSets); |
| if (tSets.size() > 0) { |
| unionTSet = first.union(others); |
| } else { |
| unionTSet = first; |
| } |
| } |
| context.setOutputDataSet(context.getOutput(transform), unionTSet); |
| } |
| } |