| /* |
| * 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 org.apache.beam.runners.core.KeyedWorkItem; |
| 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.KV; |
| import org.apache.beam.sdk.values.WindowingStrategy; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions; |
| |
| /** {@link GroupAlsoByWindowFn}'s that merge windows and groups elements in those windows. */ |
| public abstract class StreamingGroupAlsoByWindowsDoFns { |
| public static <K, InputT, AccumT, OutputT, W extends BoundedWindow> |
| GroupAlsoByWindowFn<KeyedWorkItem<K, InputT>, KV<K, OutputT>> create( |
| final WindowingStrategy<?, W> windowingStrategy, |
| StateInternalsFactory<K> stateInternalsFactory, |
| final AppliedCombineFn<K, InputT, AccumT, OutputT> combineFn, |
| final Coder<K> keyCoder) { |
| Preconditions.checkNotNull(combineFn); |
| return StreamingGroupAlsoByWindowViaWindowSetFn.create( |
| windowingStrategy, stateInternalsFactory, SystemReduceFn.combining(keyCoder, combineFn)); |
| } |
| |
| public static <K, V, W extends BoundedWindow> |
| GroupAlsoByWindowFn<KeyedWorkItem<K, V>, KV<K, Iterable<V>>> createForIterable( |
| final WindowingStrategy<?, W> windowingStrategy, |
| StateInternalsFactory<K> stateInternalsFactory, |
| Coder<V> inputCoder) { |
| // If the windowing strategy indicates we're doing a reshuffle, use the special-path. |
| if (StreamingGroupAlsoByWindowReshuffleFn.isReshuffle(windowingStrategy)) { |
| return new StreamingGroupAlsoByWindowReshuffleFn<>(); |
| } else { |
| return StreamingGroupAlsoByWindowViaWindowSetFn.create( |
| windowingStrategy, stateInternalsFactory, SystemReduceFn.buffering(inputCoder)); |
| } |
| } |
| } |