| /* |
| * 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.flink.translation.functions; |
| |
| import org.apache.beam.runners.core.construction.SerializablePipelineOptions; |
| import org.apache.beam.sdk.io.FileSystems; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.sdk.transforms.join.RawUnionValue; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.flink.api.common.functions.FlatMapFunction; |
| import org.apache.flink.api.common.functions.RichFlatMapFunction; |
| import org.apache.flink.configuration.Configuration; |
| import org.apache.flink.util.Collector; |
| |
| /** |
| * A {@link FlatMapFunction} function that filters out those elements that don't belong in this |
| * output. We need this to implement MultiOutput ParDo functions in combination with {@link |
| * FlinkDoFnFunction}. |
| */ |
| public class FlinkMultiOutputPruningFunction<T> |
| extends RichFlatMapFunction<WindowedValue<RawUnionValue>, WindowedValue<T>> { |
| |
| private final int ourOutputTag; |
| private final SerializablePipelineOptions options; |
| |
| public FlinkMultiOutputPruningFunction(int ourOutputTag, PipelineOptions options) { |
| this.ourOutputTag = ourOutputTag; |
| this.options = new SerializablePipelineOptions(options); |
| } |
| |
| @Override |
| public void open(Configuration parameters) { |
| // Initialize FileSystems for any coders which may want to use the FileSystem, |
| // see https://issues.apache.org/jira/browse/BEAM-8303 |
| FileSystems.setDefaultPipelineOptions(options.get()); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public void flatMap( |
| WindowedValue<RawUnionValue> windowedValue, Collector<WindowedValue<T>> collector) |
| throws Exception { |
| int unionTag = windowedValue.getValue().getUnionTag(); |
| if (unionTag == ourOutputTag) { |
| collector.collect( |
| (WindowedValue<T>) windowedValue.withValue(windowedValue.getValue().getValue())); |
| } |
| } |
| } |