| /* |
| * 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.util; |
| |
| import static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkNotNull; |
| |
| import org.apache.beam.runners.core.StateInternalsFactory; |
| import org.apache.beam.runners.core.SystemReduceFn; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.util.AppliedCombineFn; |
| import org.apache.beam.sdk.values.WindowingStrategy; |
| |
| /** Factory methods for creating {@link BatchGroupAlsoByWindowFn} for bounded inputs. */ |
| public class BatchGroupAlsoByWindowsDoFns { |
| /** |
| * Create a {@link BatchGroupAlsoByWindowFn} without a combine function. Depending on the {@code |
| * windowFn} this will either use iterators or window sets to implement the grouping. |
| * |
| * @param windowingStrategy The window function and trigger to use for grouping |
| * @param inputCoder the input coder to use |
| */ |
| public static <K, V, W extends BoundedWindow> |
| BatchGroupAlsoByWindowFn<K, V, Iterable<V>> createForIterable( |
| WindowingStrategy<?, W> windowingStrategy, |
| StateInternalsFactory<K> stateInternalsFactory, |
| Coder<V> inputCoder) { |
| // If the windowing strategy indicates we're doing a reshuffle, use the special-path. |
| if (BatchGroupAlsoByWindowReshuffleFn.isReshuffle(windowingStrategy)) { |
| return new BatchGroupAlsoByWindowReshuffleFn<>(); |
| } else if (BatchGroupAlsoByWindowViaIteratorsFn.isSupported(windowingStrategy)) { |
| return new BatchGroupAlsoByWindowViaIteratorsFn<K, V, W>(windowingStrategy); |
| } |
| return new BatchGroupAlsoByWindowViaOutputBufferFn<>( |
| windowingStrategy, stateInternalsFactory, SystemReduceFn.buffering(inputCoder)); |
| } |
| |
| /** Construct a {@link BatchGroupAlsoByWindowFn} using the {@code combineFn} if available. */ |
| public static <K, InputT, AccumT, OutputT, W extends BoundedWindow> |
| BatchGroupAlsoByWindowFn<K, InputT, OutputT> create( |
| final WindowingStrategy<?, W> windowingStrategy, |
| final AppliedCombineFn<K, InputT, AccumT, OutputT> combineFn) { |
| checkNotNull(combineFn); |
| return new BatchGroupAlsoByWindowAndCombineFn<>(windowingStrategy, combineFn.getFn()); |
| } |
| } |