| /* |
| * 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 static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkState; |
| |
| import com.google.api.services.dataflow.model.SideInputInfo; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.beam.runners.dataflow.util.CloudObject; |
| import org.apache.beam.runners.dataflow.util.CloudObjects; |
| import org.apache.beam.runners.dataflow.util.PropertyNames; |
| import org.apache.beam.runners.dataflow.util.Structs; |
| import org.apache.beam.runners.dataflow.worker.util.WorkerPropertyNames; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoFn; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.Receiver; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.sdk.util.CoderUtils; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.sdk.values.TupleTag; |
| |
| /** |
| * A {@link ParDoFnFactory} which returns a {@link ParDoFn} that transforms all {@code |
| * WindowedValue<V>} to {@code WindowedValue<KV<K, V>>} for a constant key {@code K}. |
| */ |
| public class PairWithConstantKeyDoFnFactory implements ParDoFnFactory { |
| @Override |
| public ParDoFn create( |
| PipelineOptions options, |
| CloudObject cloudUserFn, |
| List<SideInputInfo> sideInputInfos, |
| TupleTag<?> mainOutputTag, |
| Map<TupleTag<?>, Integer> outputTupleTagsToReceiverIndices, |
| DataflowExecutionContext<?> executionContext, |
| DataflowOperationContext operationContext) |
| throws Exception { |
| Coder<?> coder = |
| CloudObjects.coderFromCloudObject( |
| CloudObject.fromSpec(Structs.getObject(cloudUserFn, PropertyNames.ENCODING))); |
| Object key = |
| CoderUtils.decodeFromByteArray( |
| coder, Structs.getBytes(cloudUserFn, WorkerPropertyNames.ENCODED_KEY)); |
| return new PairWithConstantKeyParDoFn(key); |
| } |
| |
| /** |
| * A {@link ParDoFn} that transforms all {@code WindowedValue<V>} to {@code WindowedValue<KV<K, |
| * V>>} for a constant key {@code K}. |
| */ |
| private static class PairWithConstantKeyParDoFn<K> implements ParDoFn { |
| |
| private final K key; |
| private Receiver receiver; |
| |
| PairWithConstantKeyParDoFn(K key) { |
| this.key = key; |
| } |
| |
| @Override |
| public void startBundle(Receiver... receivers) throws Exception { |
| checkState( |
| receivers.length == 1, |
| "%s.startBundle() called with %s receivers, expected exactly 1. " |
| + "This is a bug in the Dataflow service", |
| getClass().getSimpleName(), |
| receivers.length); |
| this.receiver = receivers[0]; |
| } |
| |
| @Override |
| public void processElement(Object untypedElem) throws Exception { |
| @SuppressWarnings("unchecked") |
| WindowedValue<Object> elem = (WindowedValue) untypedElem; |
| receiver.process(elem.withValue(KV.of(key, elem.getValue()))); |
| } |
| |
| @Override |
| public void processTimers() {} |
| |
| @Override |
| public void finishBundle() {} |
| |
| @Override |
| public void abort() {} |
| } |
| } |