| /* |
| * 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; |
| |
| import java.util.Collections; |
| import org.apache.beam.runners.core.KeyedWorkItem; |
| import org.apache.beam.runners.core.OutputWindowedValue; |
| import org.apache.beam.runners.core.SideInputReader; |
| import org.apache.beam.runners.core.StepContext; |
| import org.apache.beam.runners.dataflow.worker.util.StreamingGroupAlsoByWindowFn; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.sdk.transforms.windowing.ReshuffleTrigger; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.sdk.values.WindowingStrategy; |
| |
| /** |
| * Implementation of {@link StreamingGroupAlsoByWindowsDoFns} used for the {@link ReshuffleTrigger} |
| * which outputs each element as a separate pane. |
| * |
| * @param <K> key type |
| * @param <T> value element type |
| */ |
| public class StreamingGroupAlsoByWindowReshuffleFn<K, T> |
| extends StreamingGroupAlsoByWindowFn<K, T, Iterable<T>> { |
| |
| public static boolean isReshuffle(WindowingStrategy<?, ?> strategy) { |
| return strategy.getTrigger() instanceof ReshuffleTrigger; |
| } |
| |
| @Override |
| public void processElement( |
| KeyedWorkItem<K, T> element, |
| PipelineOptions options, |
| StepContext stepContext, |
| SideInputReader sideInputReader, |
| OutputWindowedValue<KV<K, Iterable<T>>> output) |
| throws Exception { |
| @SuppressWarnings("unchecked") |
| K key = element.key(); |
| for (WindowedValue<T> item : element.elementsIterable()) { |
| output.outputWindowedValue( |
| KV.of(key, Collections.singletonList(item.getValue())), |
| item.getTimestamp(), |
| item.getWindows(), |
| item.getPane()); |
| } |
| } |
| } |