content: /*
   * 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.spark.coders;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import com.esotericsoftware.kryo.Kryo;
  import com.esotericsoftware.kryo.Registration;
  import org.apache.beam.runners.spark.SparkContextRule;
  import org.apache.beam.runners.spark.coders.SparkRunnerKryoRegistratorTest.Others.TestKryoRegistrator;
  import org.apache.beam.runners.spark.io.MicrobatchSource;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.values.KV;
  import org.junit.ClassRule;
  import org.junit.Test;
  import org.junit.experimental.runners.Enclosed;
  import org.junit.runner.RunWith;
  
  /**
   * Testing of beam registrar. Note: There can only be one Spark context at a time. For that reason
   * tests requiring a different context have to be forked using separate test classes.
   */
  @SuppressWarnings({
    "rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
  })
  @RunWith(Enclosed.class)
  public class SparkRunnerKryoRegistratorTest {
  
    public static class WithKryoSerializer {
  
      @ClassRule
      public static SparkContextRule contextRule =
          new SparkContextRule(
              KV.of("spark.serializer", "org.apache.spark.serializer.KryoSerializer"),
              KV.of("spark.kryo.registrator", TestKryoRegistrator.class.getName()));
  
      @Test
      public void testKryoRegistration() {
        TestKryoRegistrator.wasInitiated = false;
        runSimplePipelineWithSparkContextOptions(contextRule);
        assertTrue(TestKryoRegistrator.wasInitiated);
      }
    }
  
    public static class WithoutKryoSerializer {
      @ClassRule
      public static SparkContextRule contextRule =
          new SparkContextRule(KV.of("spark.kryo.registrator", TestKryoRegistrator.class.getName()));
  
      @Test
      public void testDefaultSerializerNotCallingKryo() {
        TestKryoRegistrator.wasInitiated = false;
        runSimplePipelineWithSparkContextOptions(contextRule);
        assertFalse(TestKryoRegistrator.wasInitiated);
      }
    }
  
    // Hide TestKryoRegistrator from the Enclosed JUnit runner
    interface Others {
      class TestKryoRegistrator extends SparkRunnerKryoRegistrator {
  
        static boolean wasInitiated = false;
  
        public TestKryoRegistrator() {
          wasInitiated = true;
        }
  
        @Override
        public void registerClasses(Kryo kryo) {
          super.registerClasses(kryo);
          // verify serializer for MicrobatchSource
          Registration registration = kryo.getRegistration(MicrobatchSource.class);
          assertTrue(registration.getSerializer() instanceof StatelessJavaSerializer);
        }
      }
    }
  
    private static void runSimplePipelineWithSparkContextOptions(SparkContextRule context) {
      Pipeline p = Pipeline.create(context.createPipelineOptions());
      p.apply(Create.of("a")); // some operation to trigger pipeline construction
      p.run().waitUntilFinish();
    }
  }
  