| /* |
| * 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.v20_0.com.google.common.base.Preconditions.checkState; |
| |
| import com.google.api.services.dataflow.model.SideInputInfo; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.beam.runners.dataflow.internal.IsmFormat.IsmRecord; |
| import org.apache.beam.runners.dataflow.internal.IsmFormat.IsmRecordCoder; |
| 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.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.coders.KvCoder; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.sdk.values.TupleTag; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableList; |
| |
| /** |
| * A {@link ParDoFnFactory} that creates a system {@link ParDoFn} responsible for transforming |
| * {@code WindowedValue<KV<VarInt32, KV<K, V>>>} into {@code WindowedValue<IsmRecord<V>>} for for |
| * writing to an ISM sink. |
| * |
| * <p>This {@link ParDoFnFactory} is part of an expansion of steps required to materialize ISM |
| * files. See <a href="go/dataflow-side-inputs">go/dataflow-side-inputs</a> for further details. |
| */ |
| public class ToIsmRecordForMultimapDoFnFactory 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))); |
| checkState( |
| coder instanceof IsmRecordCoder, |
| "Expected to received an instanceof an %s but got %s", |
| IsmRecordCoder.class.getSimpleName(), |
| coder); |
| IsmRecordCoder<?> ismRecordCoder = (IsmRecordCoder<?>) coder; |
| return new ToIsmRecordForMultimapParDoFn( |
| KvCoder.of( |
| ismRecordCoder.getCoderArguments().get(0), ismRecordCoder.getCoderArguments().get(1))); |
| } |
| |
| private static class ToIsmRecordForMultimapParDoFn<K, W extends BoundedWindow, V> |
| implements ParDoFn { |
| private final Coder<KV<K, W>> sortKeyCoder; |
| private Receiver receiver; |
| |
| private ToIsmRecordForMultimapParDoFn(Coder<KV<K, W>> sortKeyCoder) { |
| this.sortKeyCoder = sortKeyCoder; |
| } |
| |
| @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 { |
| WindowedValue<KV<Integer, Iterable<KV<KV<K, W>, V>>>> elem = (WindowedValue) untypedElem; |
| Iterator<KV<KV<K, W>, V>> iterator = elem.getValue().getValue().iterator(); |
| long currentKeyIndex = 0; |
| |
| KV<KV<K, W>, V> currentValue = iterator.next(); |
| Object currentKeyStructuralValue = sortKeyCoder.structuralValue(currentValue.getKey()); |
| |
| // For each element construct an ISM record keeping track of the index of the record with |
| // regards to the window. |
| while (iterator.hasNext()) { |
| KV<KV<K, W>, V> nextValue = iterator.next(); |
| Object nextKeyStructuralValue = sortKeyCoder.structuralValue(nextValue.getKey()); |
| |
| receiver.process( |
| elem.withValue( |
| IsmRecord.of( |
| ImmutableList.of( |
| currentValue.getKey().getKey(), |
| currentValue.getKey().getValue(), |
| currentKeyIndex), |
| currentValue.getValue()))); |
| |
| final long nextKeyIndex; |
| if (!currentKeyStructuralValue.equals(nextKeyStructuralValue)) { |
| // If its a new user key or window then we reset our unique key counter to zero. |
| nextKeyIndex = 0L; |
| } else { |
| // It is not a new user key or window then just increase the key index. |
| nextKeyIndex = currentKeyIndex + 1L; |
| } |
| |
| currentValue = nextValue; |
| currentKeyStructuralValue = nextKeyStructuralValue; |
| currentKeyIndex = nextKeyIndex; |
| } |
| |
| receiver.process( |
| elem.withValue( |
| IsmRecord.of( |
| ImmutableList.of( |
| currentValue.getKey().getKey(), |
| currentValue.getKey().getValue(), |
| currentKeyIndex), |
| currentValue.getValue()))); |
| } |
| |
| @Override |
| public void processTimers() {} |
| |
| @Override |
| public void finishBundle() {} |
| |
| @Override |
| public void abort() {} |
| } |
| } |