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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.flink.translation.functions;
  
  import java.util.Collections;
  import java.util.Map;
  import org.apache.beam.runners.flink.metrics.FlinkMetricContainer;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.DoFnSchemaInformation;
  import org.apache.beam.sdk.values.TupleTag;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.apache.flink.api.common.functions.RuntimeContext;
  import org.apache.flink.configuration.Configuration;
  import org.junit.Test;
  import org.mockito.Mockito;
  import org.powermock.reflect.Whitebox;
  
  /** Tests for {@link FlinkStatefulDoFnFunction}. */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
  })
  public class FlinkStatefulDoFnFunctionTest {
  
    @Test
    public void testAccumulatorRegistrationOnOperatorClose() throws Exception {
      FlinkStatefulDoFnFunction doFnFunction =
          new TestDoFnFunction(
              "step",
              WindowingStrategy.globalDefault(),
              Collections.emptyMap(),
              PipelineOptionsFactory.create(),
              Collections.emptyMap(),
              new TupleTag<>(),
              null,
              Collections.emptyMap(),
              DoFnSchemaInformation.create(),
              Collections.emptyMap());
  
      doFnFunction.open(new Configuration());
  
      String metricContainerFieldName = "metricContainer";
      FlinkMetricContainer monitoredContainer =
          Mockito.spy(
              (FlinkMetricContainer)
                  Whitebox.getInternalState(doFnFunction, metricContainerFieldName));
      Whitebox.setInternalState(doFnFunction, metricContainerFieldName, monitoredContainer);
  
      doFnFunction.close();
      Mockito.verify(monitoredContainer).registerMetricsForPipelineResult();
    }
  
    private static class TestDoFnFunction extends FlinkStatefulDoFnFunction {
  
      public TestDoFnFunction(
          String stepName,
          WindowingStrategy windowingStrategy,
          Map sideInputs,
          PipelineOptions options,
          Map outputMap,
          TupleTag mainOutputTag,
          Coder inputCoder,
          Map outputCoderMap,
          DoFnSchemaInformation doFnSchemaInformation,
          Map sideInputMapping) {
        super(
            new IdentityFn(),
            stepName,
            windowingStrategy,
            sideInputs,
            options,
            outputMap,
            mainOutputTag,
            inputCoder,
            outputCoderMap,
            doFnSchemaInformation,
            sideInputMapping);
      }
  
      @Override
      public RuntimeContext getRuntimeContext() {
        return Mockito.mock(RuntimeContext.class);
      }
  
      private static class IdentityFn<T> extends DoFn<T, T> {
        @ProcessElement
        public void processElement(ProcessContext c) {
          c.output(c.element());
        }
      }
    }
  }
  