[
https://issues.apache.org/jira/browse/BEAM-6269?focusedWorklogId=178641&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-178641
]
ASF GitHub Bot logged work on BEAM-6269:
----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Dec/18 09:40
Start Date: 26/Dec/18 09:40
Worklog Time Spent: 10m
Work Description: chamikaramj commented on pull request #7316:
[BEAM-6269] Cross-SDK transform expansion protocol.
URL: https://github.com/apache/beam/pull/7316#discussion_r243969695
##########
File path:
runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/ConstructionService.java
##########
@@ -0,0 +1,214 @@
+/*
+ * 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 com.google.auto.service.AutoService;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Iterables;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Map;
+import java.util.ServiceLoader;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import org.apache.beam.model.construction.v1.ConstructionApi;
+import org.apache.beam.model.construction.v1.ConstructionServiceGrpc;
+import org.apache.beam.model.pipeline.v1.RunnerApi;
+import org.apache.beam.sdk.Pipeline;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PCollectionList;
+import org.apache.beam.sdk.values.PCollectionTuple;
+import org.apache.beam.sdk.values.PDone;
+import org.apache.beam.sdk.values.PValue;
+import org.apache.beam.sdk.values.TupleTag;
+import org.apache.beam.vendor.grpc.v1_13_1.io.grpc.Server;
+import org.apache.beam.vendor.grpc.v1_13_1.io.grpc.ServerBuilder;
+import org.apache.beam.vendor.grpc.v1_13_1.io.grpc.stub.StreamObserver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/** A service that allows pipeline construction from a remote SDK. */
+public class ConstructionService extends
ConstructionServiceGrpc.ConstructionServiceImplBase {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(ConstructionService.class);
+
+ /**
+ * A registrar that creates {@link TransformProvider} instances from {@link
+ * RunnerApi.FunctionSpec}s.
+ *
+ * <p>Transform authors have the ability to provide a registrar by creating
a {@link
+ * ServiceLoader} entry and a concrete implementation of this interface.
+ *
+ * <p>It is optional but recommended to use one of the many build time tools
such as {@link
+ * AutoService} to generate the necessary META-INF files automatically.
+ */
+ public interface ConstructionServiceRegistrar {
+ Map<String, TransformProvider> knownTransforms();
+ }
+
+ /**
+ * Provides a mapping of {@link RunnerApi.FunctionSpec} to a {@link
PTransform}, together with
+ * mappings of its inputs and outputs to maps of PCollections.
+ *
+ * @param <InputT> input {@link PValue} type of the transform
+ * @param <OutputT> output {@link PValue} type of the transform
+ */
+ public interface TransformProvider<InputT extends PValue, OutputT extends
PValue> {
+
+ default InputT createInput(Pipeline p, Map<String, PCollection<?>> inputs)
{
+ if (inputs.size() == 0) {
+ return (InputT) p.begin();
+ }
+ if (inputs.size() == 1) {
+ return (InputT) Iterables.getOnlyElement(inputs.values());
+ } else {
+ PCollectionTuple inputTuple = PCollectionTuple.empty(p);
+ for (Map.Entry<String, PCollection<?>> entry : inputs.entrySet()) {
+ inputTuple = inputTuple.and(new TupleTag(entry.getKey()),
entry.getValue());
+ }
+ return (InputT) inputTuple;
+ }
+ }
+
+ PTransform<InputT, OutputT> getTransform(RunnerApi.FunctionSpec spec);
+
+ default Map<String, PCollection<?>> extractOutputs(OutputT output) {
+ if (output instanceof PDone) {
+ return Collections.emptyMap();
+ } else if (output instanceof PCollection) {
+ return ImmutableMap.of("output", (PCollection<?>) output);
+ } else if (output instanceof PCollectionTuple) {
+ return ((PCollectionTuple) output)
+ .getAll()
+ .entrySet()
+ .stream()
+ .collect(Collectors.toMap(entry -> entry.getKey().toString(),
Map.Entry::getValue));
+ } else if (output instanceof PCollectionList<?>) {
+ PCollectionList<?> listOutput = (PCollectionList<?>) output;
+ return IntStream.range(0, listOutput.size())
+ .boxed()
+ .collect(Collectors.toMap(index -> "output_" + index,
listOutput::get));
+ } else {
+ throw new UnsupportedOperationException("Unknown output type: " +
output.getClass());
+ }
+ }
+
+ default Map<String, PCollection<?>> apply(
+ Pipeline p, String name, RunnerApi.FunctionSpec spec, Map<String,
PCollection<?>> inputs) {
+ return extractOutputs(
+ Pipeline.applyTransform(name, createInput(p, inputs),
getTransform(spec)));
+ }
+ }
+
+ private Map<String, TransformProvider> registeredTransforms =
loadRegisteredTransforms();
Review comment:
So we maintain a list of pre-registered transforms for expansion ?
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Issue Time Tracking
-------------------
Worklog Id: (was: 178641)
Time Spent: 0.5h (was: 20m)
> Support mixed-language pipelines.
> ---------------------------------
>
> Key: BEAM-6269
> URL: https://issues.apache.org/jira/browse/BEAM-6269
> Project: Beam
> Issue Type: New Feature
> Components: beam-model, runner-core, sdk-java-core, sdk-py-core
> Reporter: Robert Bradshaw
> Assignee: Kenneth Knowles
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
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