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.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import com.google.auto.service.AutoService;
  import java.util.ArrayList;
  import java.util.List;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.transforms.PTransform;
  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;
  
  @AutoService(GenericDlqProvider.class)
  public class StoringDlqProvider implements GenericDlqProvider {
    static final String ID = "storing_dlq_provider_testonly_do_not_use";
    static final String CONFIG = "storing_dlq_provider_required_config_value";
    private static final List<Failure> FAILURES = new ArrayList<>();
  
    @Override
    public String identifier() {
      return ID;
    }
  
    public static synchronized void reset() {
      FAILURES.clear();
    }
  
    private static synchronized void addValue(Failure failure) {
      FAILURES.add(failure);
    }
  
    public static synchronized List<Failure> getFailures() {
      return ImmutableList.copyOf(FAILURES);
    }
  
    @Override
    public PTransform<PCollection<Failure>, PDone> newDlqTransform(String config) {
      checkArgument(config.equals(CONFIG));
      return new PTransform<PCollection<Failure>, PDone>() {
        @Override
        public PDone expand(PCollection<Failure> input) {
          input.apply(
              MapElements.into(TypeDescriptor.of(Void.class))
                  .via(
                      x -> {
                        addValue(x);
                        return null;
                      }));
          return PDone.in(input.getPipeline());
        }
      };
    }
  }
  