| /* |
| * 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.spark.structuredstreaming.translation.batch; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument; |
| |
| import java.util.Collection; |
| import org.apache.beam.runners.spark.structuredstreaming.translation.AbstractTranslationContext; |
| import org.apache.beam.runners.spark.structuredstreaming.translation.TransformTranslator; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.PCollectionList; |
| import org.apache.beam.sdk.values.PValue; |
| import org.apache.spark.sql.Dataset; |
| |
| @SuppressWarnings({ |
| "nullness" // TODO(https://github.com/apache/beam/issues/20497) |
| }) |
| class FlattenTranslatorBatch<T> |
| implements TransformTranslator<PTransform<PCollectionList<T>, PCollection<T>>> { |
| |
| @Override |
| public void translateTransform( |
| PTransform<PCollectionList<T>, PCollection<T>> transform, |
| AbstractTranslationContext context) { |
| Collection<PCollection<?>> pcollectionList = context.getInputs().values(); |
| Dataset<WindowedValue<T>> result = null; |
| if (pcollectionList.isEmpty()) { |
| result = context.emptyDataset(); |
| } else { |
| for (PValue pValue : pcollectionList) { |
| checkArgument( |
| pValue instanceof PCollection, |
| "Got non-PCollection input to flatten: %s of type %s", |
| pValue, |
| pValue.getClass().getSimpleName()); |
| @SuppressWarnings("unchecked") |
| PCollection<T> pCollection = (PCollection<T>) pValue; |
| Dataset<WindowedValue<T>> current = context.getDataset(pCollection); |
| if (result == null) { |
| result = current; |
| } else { |
| result = result.union(current); |
| } |
| } |
| } |
| context.putDataset(context.getOutput(), result); |
| } |
| } |