| /* |
| * 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.core.construction; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| import com.google.common.collect.ImmutableMap; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.beam.sdk.common.runner.v1.RunnerApi; |
| import org.apache.beam.sdk.common.runner.v1.RunnerApi.FunctionSpec; |
| import org.apache.beam.sdk.runners.AppliedPTransform; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.PValue; |
| import org.apache.beam.sdk.values.TupleTag; |
| |
| /** |
| * Utilities for converting {@link PTransform PTransforms} to and from {@link RunnerApi Runner API |
| * protocol buffers}. |
| */ |
| public class PTransforms { |
| private static final Map<Class<? extends PTransform>, TransformPayloadTranslator> |
| KNOWN_PAYLOAD_TRANSLATORS = |
| ImmutableMap.<Class<? extends PTransform>, TransformPayloadTranslator>builder().build(); |
| // TODO: ParDoPayload, WindowIntoPayload, ReadPayload, CombinePayload |
| // TODO: "Flatten Payload", etc? |
| // TODO: Load via service loader. |
| private PTransforms() {} |
| |
| /** |
| * Translates an {@link AppliedPTransform} into a runner API proto. |
| * |
| * <p>Does not register the {@code appliedPTransform} within the provided {@link SdkComponents}. |
| */ |
| static RunnerApi.PTransform toProto( |
| AppliedPTransform<?, ?, ?> appliedPTransform, |
| List<AppliedPTransform<?, ?, ?>> subtransforms, |
| SdkComponents components) |
| throws IOException { |
| RunnerApi.PTransform.Builder transformBuilder = RunnerApi.PTransform.newBuilder(); |
| for (Map.Entry<TupleTag<?>, PValue> taggedInput : appliedPTransform.getInputs().entrySet()) { |
| checkArgument( |
| taggedInput.getValue() instanceof PCollection, |
| "Unexpected input type %s", |
| taggedInput.getValue().getClass()); |
| transformBuilder.putInputs( |
| toProto(taggedInput.getKey()), |
| components.registerPCollection((PCollection<?>) taggedInput.getValue())); |
| } |
| for (Map.Entry<TupleTag<?>, PValue> taggedOutput : appliedPTransform.getOutputs().entrySet()) { |
| // TODO: Remove gating |
| if (taggedOutput.getValue() instanceof PCollection) { |
| checkArgument( |
| taggedOutput.getValue() instanceof PCollection, |
| "Unexpected output type %s", |
| taggedOutput.getValue().getClass()); |
| transformBuilder.putOutputs( |
| toProto(taggedOutput.getKey()), |
| components.registerPCollection((PCollection<?>) taggedOutput.getValue())); |
| } |
| } |
| for (AppliedPTransform<?, ?, ?> subtransform : subtransforms) { |
| transformBuilder.addSubtransforms(components.getExistingPTransformId(subtransform)); |
| } |
| |
| transformBuilder.setUniqueName(appliedPTransform.getFullName()); |
| // TODO: Display Data |
| |
| PTransform<?, ?> transform = appliedPTransform.getTransform(); |
| if (KNOWN_PAYLOAD_TRANSLATORS.containsKey(transform.getClass())) { |
| FunctionSpec payload = |
| KNOWN_PAYLOAD_TRANSLATORS |
| .get(transform.getClass()) |
| .translate(appliedPTransform, components); |
| transformBuilder.setSpec(payload); |
| } |
| |
| return transformBuilder.build(); |
| } |
| |
| private static String toProto(TupleTag<?> tag) { |
| return tag.getId(); |
| } |
| |
| /** |
| * A translator consumes a {@link PTransform} application and produces the appropriate |
| * FunctionSpec for a distinguished or primitive transform within the Beam runner API. |
| */ |
| public interface TransformPayloadTranslator<T extends PTransform<?, ?>> { |
| FunctionSpec translate(AppliedPTransform<?, ?, T> transform, SdkComponents components); |
| } |
| } |