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.schemas.io;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.ByteArrayInputStream;
  import java.util.ArrayList;
  import java.util.List;
  import org.apache.beam.sdk.coders.VarLongCoder;
  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.Create;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.transforms.SimpleFunction;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PDone;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class DeadLetteredTransformTest {
    @Rule public final transient TestPipeline p = TestPipeline.create();
  
    private static final String FAILURE_KEY = "KLJSDHFLKJDHF";
  
    private static final List<Failure> FAILURES = new ArrayList<>();
  
    private static synchronized void capture(Failure val) {
      FAILURES.add(val);
    }
  
    private static synchronized List<Failure> getFailures() {
      return ImmutableList.copyOf(FAILURES);
    }
  
    private static synchronized void resetFailures() {
      FAILURES.clear();
    }
  
    @Test
    @Category(NeedsRunner.class)
    public void testDeadLettersOnlyFailures() throws Exception {
      resetFailures();
      PCollection<Long> elements = p.apply(Create.of(10L, 20L).withCoder(VarLongCoder.of()));
      PCollection<Long> results =
          elements.apply(
              new DeadLetteredTransform<>(
                  SimpleFunction.fromSerializableFunctionWithOutputType(
                      x -> {
                        if (x == 10L) {
                          throw new RuntimeException(FAILURE_KEY);
                        }
                        return x;
                      },
                      TypeDescriptor.of(Long.class)),
                  new PTransform<PCollection<Failure>, PDone>() {
                    @Override
                    public PDone expand(PCollection<Failure> input) {
                      input.apply(
                          MapElements.into(TypeDescriptor.of(Void.class))
                              .via(
                                  failure -> {
                                    capture(failure);
                                    return null;
                                  }));
                      return PDone.in(input.getPipeline());
                    }
                  }));
      PAssert.that(results).containsInAnyOrder(20L);
      p.run().waitUntilFinish();
      List<Failure> failures = getFailures();
      assertEquals(1, failures.size());
      Failure failure = failures.iterator().next();
      assertEquals(
          10L, VarLongCoder.of().decode(new ByteArrayInputStream(failure.getPayload())).longValue());
      assertTrue(failure.getError().contains(FAILURE_KEY));
    }
  }
  