| /* |
| * 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.LinkedHashMap; |
| import java.util.Map; |
| import org.apache.beam.runners.core.StepContext; |
| import org.apache.beam.runners.core.TimerInternals; |
| import org.apache.beam.runners.direct.WatermarkManager.TimerUpdate; |
| import org.apache.beam.runners.direct.WatermarkManager.TransformWatermarks; |
| import org.apache.beam.runners.local.StructuralKey; |
| |
| /** |
| * Execution Context for the {@link DirectRunner}. |
| * |
| * <p>This implementation is not thread safe. A new {@link DirectExecutionContext} must be created |
| * for each thread that requires it. |
| */ |
| class DirectExecutionContext { |
| private final Clock clock; |
| private final StructuralKey<?> key; |
| private final CopyOnAccessInMemoryStateInternals existingState; |
| private final TransformWatermarks watermarks; |
| private Map<String, DirectStepContext> cachedStepContexts = new LinkedHashMap<>(); |
| |
| public DirectExecutionContext( |
| Clock clock, |
| StructuralKey<?> key, |
| CopyOnAccessInMemoryStateInternals existingState, |
| TransformWatermarks watermarks) { |
| this.clock = clock; |
| this.key = key; |
| this.existingState = existingState; |
| this.watermarks = watermarks; |
| } |
| |
| private DirectStepContext createStepContext() { |
| return new DirectStepContext(); |
| } |
| |
| /** Returns the {@link StepContext} associated with the given step. */ |
| public DirectStepContext getStepContext(String stepName) { |
| return cachedStepContexts.computeIfAbsent(stepName, k -> createStepContext()); |
| } |
| |
| /** Step Context for the {@link DirectRunner}. */ |
| public class DirectStepContext implements StepContext { |
| private CopyOnAccessInMemoryStateInternals<?> stateInternals; |
| private DirectTimerInternals timerInternals; |
| |
| public DirectStepContext() {} |
| |
| @Override |
| public CopyOnAccessInMemoryStateInternals<?> stateInternals() { |
| if (stateInternals == null) { |
| stateInternals = CopyOnAccessInMemoryStateInternals.withUnderlying(key, existingState); |
| } |
| return stateInternals; |
| } |
| |
| @Override |
| public DirectTimerInternals timerInternals() { |
| if (timerInternals == null) { |
| timerInternals = DirectTimerInternals.create(clock, watermarks, TimerUpdate.builder(key)); |
| } |
| return timerInternals; |
| } |
| |
| /** |
| * Commits the state of this step, and returns the committed state. If the step has not accessed |
| * any state, return null. |
| */ |
| public CopyOnAccessInMemoryStateInternals commitState() { |
| if (stateInternals != null) { |
| return stateInternals.commit(); |
| } |
| return null; |
| } |
| |
| /** |
| * Gets the timer update of the {@link TimerInternals} of this {@link DirectStepContext}, which |
| * is empty if the {@link TimerInternals} were never accessed. |
| */ |
| public TimerUpdate getTimerUpdate() { |
| if (timerInternals == null) { |
| return TimerUpdate.empty(); |
| } |
| return timerInternals.getTimerUpdate(); |
| } |
| } |
| } |