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.sdk.transforms;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.hasKey;
  import static org.hamcrest.Matchers.hasSize;
  import static org.junit.Assert.assertEquals;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.sdk.testing.NeedsRunner;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.WithFailures.ExceptionAsMapHandler;
  import org.apache.beam.sdk.transforms.WithFailures.ThrowableHandler;
  import org.apache.beam.sdk.values.EncodableThrowable;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionList;
  import org.apache.beam.sdk.values.TypeDescriptors;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link WithFailures}. */
  @RunWith(JUnit4.class)
  public class WithFailuresTest implements Serializable {
  
    @Rule public final transient TestPipeline pipeline = TestPipeline.create();
  
    @Test
    @Category(NeedsRunner.class)
    public void testDirectException() {
      List<PCollection<KV<Integer, EncodableThrowable>>> errorCollections = new ArrayList<>();
      PCollection<Integer> output =
          pipeline
              .apply(Create.of(0, 1))
              .apply(
                  MapElements.into(TypeDescriptors.integers())
                      .via((Integer i) -> 1 / i)
                      .exceptionsVia(new ThrowableHandler<Integer>() {}))
              .failuresTo(errorCollections);
  
      PAssert.that(output).containsInAnyOrder(1);
  
      PAssert.thatSingleton(PCollectionList.of(errorCollections).apply(Flatten.pCollections()))
          .satisfies(
              kv -> {
                assertEquals(Integer.valueOf(0), kv.getKey());
  
                Throwable throwable = kv.getValue().throwable();
                assertEquals("java.lang.ArithmeticException", throwable.getClass().getName());
                assertEquals("/ by zero", throwable.getMessage());
                return null;
              });
  
      pipeline.run();
    }
  
    /** Test of {@link WithFailures.Result#failuresTo(List)}. */
    @Test
    @Category(NeedsRunner.class)
    public void testExceptionAsMap() {
      List<PCollection<KV<Integer, Map<String, String>>>> errorCollections = new ArrayList<>();
      PCollection<Integer> output =
          pipeline
              .apply(Create.of(0, 1))
              .apply(
                  MapElements.into(TypeDescriptors.integers())
                      .via((Integer i) -> 1 / i)
                      .exceptionsVia(new ExceptionAsMapHandler<Integer>() {}))
              .failuresTo(errorCollections);
  
      PAssert.that(output).containsInAnyOrder(1);
  
      PAssert.thatSingleton(PCollectionList.of(errorCollections).apply(Flatten.pCollections()))
          .satisfies(
              kv -> {
                assertEquals(Integer.valueOf(0), kv.getKey());
                assertThat(kv.getValue().entrySet(), hasSize(3));
                assertThat(kv.getValue(), hasKey("stackTrace"));
                assertEquals("java.lang.ArithmeticException", kv.getValue().get("className"));
                assertEquals("/ by zero", kv.getValue().get("message"));
                return null;
              });
  
      pipeline.run();
    }
  }
  