| /* |
| * 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.direct; |
| |
| import java.util.Collection; |
| import org.apache.beam.sdk.Pipeline; |
| 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.PInput; |
| |
| /** |
| * Provides {@link CommittedBundle bundles} that will be provided to the {@link PTransform |
| * PTransforms} that are at the root of a {@link Pipeline}. |
| */ |
| interface RootInputProvider<T, ShardT, InputT extends PInput> { |
| /** |
| * Get the initial inputs for the {@link AppliedPTransform}. The {@link AppliedPTransform} will be |
| * provided with these {@link CommittedBundle bundles} as input when the {@link Pipeline} runs. |
| * |
| * <p>For source transforms, these should be sufficient that, when provided to the evaluators |
| * produced by {@link TransformEvaluatorFactory#forApplication(AppliedPTransform, |
| * CommittedBundle)}, all of the elements contained in the source are eventually produced. |
| * |
| * @param transform the {@link AppliedPTransform} to get initial inputs for. |
| * @param targetParallelism the target amount of parallelism to obtain from the source. Must be |
| * greater than or equal to 1. |
| */ |
| Collection<CommittedBundle<ShardT>> getInitialInputs( |
| AppliedPTransform<InputT, PCollection<T>, PTransform<InputT, PCollection<T>>> transform, |
| int targetParallelism) |
| throws Exception; |
| } |