| /* |
| * 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.fn.harness; |
| |
| import com.google.auto.service.AutoService; |
| import java.io.IOException; |
| import java.util.Map; |
| import org.apache.beam.model.pipeline.v1.RunnerApi.PTransform; |
| import org.apache.beam.model.pipeline.v1.RunnerApi.SdkFunctionSpec; |
| import org.apache.beam.model.pipeline.v1.RunnerApi.StandardPTransforms; |
| import org.apache.beam.runners.core.construction.BeamUrns; |
| import org.apache.beam.runners.core.construction.PCollectionViewTranslation; |
| import org.apache.beam.sdk.function.ThrowingFunction; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.transforms.windowing.WindowMappingFn; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableMap; |
| |
| /** |
| * Represents mapping of main input window onto side input window. |
| * |
| * <p>Side input window mapping function: |
| * |
| * <ul> |
| * <li>Input: {@code KV<nonce, MainInputWindow>} |
| * <li>Output: {@code KV<nonce, SideInputWindow>} |
| * </ul> |
| * |
| * <p>For each main input window, the side input window is returned. The nonce is used by a runner |
| * to associate each input with its output. The nonce is represented as an opaque set of bytes. |
| */ |
| public class WindowMappingFnRunner { |
| static final String URN = BeamUrns.getUrn(StandardPTransforms.Primitives.MAP_WINDOWS); |
| |
| /** |
| * A registrar which provides a factory to handle mapping main input windows onto side input |
| * windows. |
| */ |
| @AutoService(PTransformRunnerFactory.Registrar.class) |
| public static class Registrar implements PTransformRunnerFactory.Registrar { |
| |
| @Override |
| public Map<String, PTransformRunnerFactory> getPTransformRunnerFactories() { |
| return ImmutableMap.of( |
| URN, |
| MapFnRunners.forValueMapFnFactory(WindowMappingFnRunner::createMapFunctionForPTransform)); |
| } |
| } |
| |
| static <T, W1 extends BoundedWindow, W2 extends BoundedWindow> |
| ThrowingFunction<KV<T, W1>, KV<T, W2>> createMapFunctionForPTransform( |
| String ptransformId, PTransform pTransform) throws IOException { |
| SdkFunctionSpec windowMappingFnPayload = |
| SdkFunctionSpec.parseFrom(pTransform.getSpec().getPayload()); |
| WindowMappingFn<W2> windowMappingFn = |
| (WindowMappingFn<W2>) |
| PCollectionViewTranslation.windowMappingFnFromProto(windowMappingFnPayload); |
| return (KV<T, W1> input) -> |
| KV.of(input.getKey(), windowMappingFn.getSideInputWindow(input.getValue())); |
| } |
| } |