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runners/spark/src/test/java/org/apache/beam/runners/spark/ForceStreamingTest.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.beam.runners.spark; | ||
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| import static org.hamcrest.MatcherAssert.assertThat; | ||
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| import java.io.IOException; | ||
| import java.util.List; | ||
| import org.apache.beam.sdk.Pipeline; | ||
| import org.apache.beam.sdk.coders.Coder; | ||
| import org.apache.beam.sdk.io.BoundedReadFromUnboundedSource; | ||
| import org.apache.beam.sdk.io.Read; | ||
| import org.apache.beam.sdk.io.UnboundedSource; | ||
| import org.apache.beam.sdk.options.PipelineOptions; | ||
| import org.apache.beam.sdk.options.PipelineOptionsFactory; | ||
| import org.apache.beam.sdk.runners.TransformHierarchy; | ||
| import org.apache.beam.sdk.transforms.PTransform; | ||
| import org.junit.Test; | ||
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| /** | ||
| * Test that we can "force streaming" on pipelines with {@link BoundedReadFromUnboundedSource} | ||
| * inputs using the {@link TestSparkRunner}. | ||
| * | ||
| * <p>The test validates that when a pipeline reads from a {@link BoundedReadFromUnboundedSource}, | ||
| * with {@link SparkPipelineOptions#setStreaming(boolean)} true | ||
| * and using the {@link TestSparkRunner}; the {@link Read.Bounded} transform | ||
| * is replaced by an {@link Read.Unbounded} transform. | ||
| * | ||
| * <p>This test does not execute a pipeline. | ||
| */ | ||
| public class ForceStreamingTest { | ||
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| @Test | ||
| public void test() throws IOException { | ||
| SparkPipelineOptions options = PipelineOptionsFactory.create().as(SparkPipelineOptions.class); | ||
| options.setRunner(TestSparkRunner.class); | ||
| // force streaming. | ||
| options.setStreaming(true); | ||
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| Pipeline pipeline = Pipeline.create(options); | ||
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| // apply the BoundedReadFromUnboundedSource. | ||
| @SuppressWarnings("unchecked") | ||
| BoundedReadFromUnboundedSource boundedRead = | ||
| Read.from(new FakeUnboundedSource()).withMaxNumRecords(-1); | ||
| //noinspection unchecked | ||
| pipeline.apply(boundedRead); | ||
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| UnboundedReadDetector unboundedReadDetector = new UnboundedReadDetector(); | ||
| pipeline.traverseTopologically(unboundedReadDetector); | ||
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| // assert that the applied BoundedReadFromUnboundedSource | ||
| // is being treated as an unbounded read. | ||
| assertThat("Expected to have an unbounded read.", unboundedReadDetector.isUnbounded); | ||
| } | ||
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| /** | ||
| * Traverses the Pipeline to check if the input is indeed a {@link Read.Unbounded}. | ||
| */ | ||
| private class UnboundedReadDetector extends Pipeline.PipelineVisitor.Defaults { | ||
| private boolean isUnbounded = false; | ||
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| @Override | ||
| public void visitPrimitiveTransform(TransformHierarchy.Node node) { | ||
| Class<? extends PTransform> transformClass = node.getTransform().getClass(); | ||
| if (transformClass == Read.Unbounded.class) { | ||
| isUnbounded = true; | ||
| } | ||
| } | ||
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| } | ||
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| /** | ||
| * A fake {@link UnboundedSource} to satisfy the compiler. | ||
| */ | ||
| private static class FakeUnboundedSource extends UnboundedSource { | ||
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| @Override | ||
| public List<? extends UnboundedSource> generateInitialSplits( | ||
| int desiredNumSplits, | ||
| PipelineOptions options) throws Exception { | ||
| return null; | ||
| } | ||
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| @Override | ||
| public UnboundedReader createReader( | ||
| PipelineOptions options, | ||
| CheckpointMark checkpointMark) throws IOException { | ||
| return null; | ||
| } | ||
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| @Override | ||
| public Coder getCheckpointMarkCoder() { | ||
| return null; | ||
| } | ||
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| @Override | ||
| public void validate() { } | ||
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| @Override | ||
| public Coder getDefaultOutputCoder() { | ||
| return null; | ||
| } | ||
| } | ||
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| } |
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