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[BEAM-2915] Add support for handling bag user state to the java-fn-ex…
…ecution library to support runner integration. Note that we specifically use an optimization which significantly simplifies the logical stream handling during get/append since we don't need to encode/decode elements to actually find the element boundaries. We just store and replay the chunks the user gave us significantly reducing the amount of pipeline manipulation the needs to happen.
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85
...ava/src/main/java/org/apache/beam/runners/core/construction/graph/UserStateReference.java
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| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.beam.runners.core.construction.graph; | ||
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| import com.google.auto.value.AutoValue; | ||
| import com.google.common.collect.Iterables; | ||
| import com.google.common.collect.Sets; | ||
| import java.util.Collections; | ||
| import java.util.Set; | ||
| import org.apache.beam.model.pipeline.v1.RunnerApi; | ||
| import org.apache.beam.model.pipeline.v1.RunnerApi.ExecutableStagePayload.UserStateId; | ||
| import org.apache.beam.model.pipeline.v1.RunnerApi.PCollection; | ||
| import org.apache.beam.model.pipeline.v1.RunnerApi.PTransform; | ||
| import org.apache.beam.model.pipeline.v1.RunnerApi.ParDoPayload; | ||
| import org.apache.beam.runners.core.construction.PTransformTranslation; | ||
| import org.apache.beam.runners.core.construction.graph.PipelineNode.PCollectionNode; | ||
| import org.apache.beam.runners.core.construction.graph.PipelineNode.PTransformNode; | ||
| import org.apache.beam.vendor.protobuf.v3.com.google.protobuf.InvalidProtocolBufferException; | ||
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|
||
| /** | ||
| * A reference to user state. This includes the PTransform that references the user state as well as | ||
| * the local name. Both are necessary in order to fully resolve user state. | ||
| */ | ||
| @AutoValue | ||
| public abstract class UserStateReference { | ||
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| /** Create a user state reference. */ | ||
| public static UserStateReference of( | ||
| PTransformNode transform, String localName, PCollectionNode collection) { | ||
| return new AutoValue_UserStateReference(transform, localName, collection); | ||
| } | ||
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| /** Create a user state reference from a UserStateId proto and components. */ | ||
| public static UserStateReference fromUserStateId( | ||
| UserStateId userStateId, RunnerApi.Components components) { | ||
| String transformId = userStateId.getTransformId(); | ||
| String localName = userStateId.getLocalName(); | ||
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| PTransform transform = components.getTransformsOrThrow(transformId); | ||
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| Set<String> sideInputNames = Collections.emptySet(); | ||
| if (PTransformTranslation.PAR_DO_TRANSFORM_URN.equals(transform.getSpec().getUrn())) { | ||
| try { | ||
| sideInputNames = | ||
| ParDoPayload.parseFrom(transform.getSpec().getPayload()).getSideInputsMap().keySet(); | ||
| } catch (InvalidProtocolBufferException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| // Get the main input PCollection id. | ||
| String collectionId = | ||
| transform.getInputsOrThrow( | ||
| Iterables.getOnlyElement( | ||
| Sets.difference(transform.getInputsMap().keySet(), sideInputNames))); | ||
| PCollection collection = components.getPcollectionsOrThrow(collectionId); | ||
| return UserStateReference.of( | ||
| PipelineNode.pTransform(transformId, transform), | ||
| localName, | ||
| PipelineNode.pCollection(collectionId, collection)); | ||
| } | ||
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| /** The id of the PTransform that uses this user state. */ | ||
| public abstract PTransformNode transform(); | ||
| /** The local name the referencing PTransform uses to refer to this user state. */ | ||
| public abstract String localName(); | ||
| /** The PCollection that represents the input to the PTransform. */ | ||
| public abstract PCollectionNode collection(); | ||
| } |
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