| /* |
| * 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.portable; |
| |
| import org.apache.beam.runners.core.construction.graph.PipelineNode.PTransformNode; |
| import org.apache.beam.runners.direct.ExecutableGraph; |
| import org.apache.beam.sdk.Pipeline; |
| import org.apache.beam.sdk.PipelineResult.State; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.joda.time.Duration; |
| |
| /** |
| * An executor that schedules and executes {@link PTransformNode PTransformNodes} for both source |
| * and intermediate {@link PTransform PTransforms}. |
| */ |
| interface PipelineExecutor { |
| /** |
| * Starts this executor on the provided graph. The {@link RootProviderRegistry} will be used to |
| * create initial inputs for the provide {@link ExecutableGraph graph}. |
| */ |
| void start(); |
| |
| /** |
| * Blocks until the job being executed enters a terminal state. A job is completed after all root |
| * {@link PTransformNode PTransformNodes} have completed, and all {@link CommittedBundle Bundles} |
| * have been consumed. Jobs may also terminate abnormally. |
| * |
| * <p>Waits for up to the provided duration, or forever if the provided duration is less than or |
| * equal to zero. |
| * |
| * @return The terminal state of the Pipeline. |
| * @throws Exception whenever an executor thread throws anything, transfers to the waiting thread |
| * and rethrows it |
| */ |
| State waitUntilFinish(Duration duration) throws Exception; |
| |
| /** Gets the current state of the {@link Pipeline}. */ |
| State getPipelineState(); |
| |
| /** |
| * Shuts down the executor. |
| * |
| * <p>The executor may continue to run for a short time after this method returns. |
| */ |
| void stop(); |
| } |