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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.dataflow.worker.streaming.config;
  
  import static com.google.common.truth.Truth.assertThat;
  import static java.util.stream.Collectors.toMap;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertThrows;
  import static org.junit.Assert.assertTrue;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import com.google.api.services.dataflow.model.MapTask;
  import java.io.IOException;
  import java.util.List;
  import java.util.NoSuchElementException;
  import java.util.Optional;
  import org.apache.beam.runners.dataflow.worker.windmill.Windmill;
  import org.apache.beam.runners.dataflow.worker.windmill.WindmillServerStub;
  import org.apache.beam.sdk.extensions.gcp.util.Transport;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class StreamingApplianceComputationConfigFetcherTest {
    private final WindmillServerStub mockWindmillServer = mock(WindmillServerStub.class);
  
    @Test
    public void testGetComputationConfig() throws IOException {
      List<Windmill.GetConfigResponse.NameMapEntry> nameMapEntries =
          ImmutableList.of(
              Windmill.GetConfigResponse.NameMapEntry.newBuilder()
                  .setUserName("userName1")
                  .setSystemName("systemName1")
                  .build(),
              Windmill.GetConfigResponse.NameMapEntry.newBuilder()
                  .setUserName("userName2")
                  .setSystemName("userName2")
                  .build());
      String serializedMapTask =
          Transport.getJsonFactory()
              .toString(
                  new MapTask()
                      .setSystemName("systemName")
                      .setStageName("stageName")
                      .setInstructions(ImmutableList.of()));
      Windmill.GetConfigResponse getConfigResponse =
          Windmill.GetConfigResponse.newBuilder()
              .addAllNameMap(nameMapEntries)
              .addComputationConfigMap(
                  Windmill.GetConfigResponse.ComputationConfigMapEntry.newBuilder()
                      .setComputationId("systemName")
                      .setComputationConfig(
                          Windmill.ComputationConfig.newBuilder()
                              .addTransformUserNameToStateFamily(
                                  Windmill.ComputationConfig.TransformUserNameToStateFamilyEntry
                                      .newBuilder()
                                      .setStateFamily("stateFamilyName")
                                      .setTransformUserName("transformUserName")
                                      .build())
                              .build())
                      .build())
              .addCloudWorks(serializedMapTask)
              .build();
      ComputationConfig expectedConfig =
          ComputationConfig.create(
              Transport.getJsonFactory().fromString(serializedMapTask, MapTask.class),
              getConfigResponse.getComputationConfigMapList().stream()
                  .map(Windmill.GetConfigResponse.ComputationConfigMapEntry::getComputationConfig)
                  .flatMap(
                      computationConfig ->
                          computationConfig.getTransformUserNameToStateFamilyList().stream())
                  .collect(
                      toMap(
                          Windmill.ComputationConfig.TransformUserNameToStateFamilyEntry
                              ::getTransformUserName,
                          Windmill.ComputationConfig.TransformUserNameToStateFamilyEntry
                              ::getStateFamily)),
              nameMapEntries.stream()
                  .collect(
                      toMap(
                          Windmill.GetConfigResponse.NameMapEntry::getUserName,
                          Windmill.GetConfigResponse.NameMapEntry::getSystemName)));
      StreamingApplianceComputationConfigFetcher configLoader =
          createStreamingApplianceConfigLoader();
      when(mockWindmillServer.getConfig(any())).thenReturn(getConfigResponse);
      Optional<ComputationConfig> config = configLoader.fetchConfig("someComputationId");
      assertTrue(config.isPresent());
      assertThat(config.get()).isEqualTo(expectedConfig);
    }
  
    @Test
    public void testGetComputationConfig_whenNoConfigReturned() {
      StreamingApplianceComputationConfigFetcher configLoader =
          createStreamingApplianceConfigLoader();
      when(mockWindmillServer.getConfig(any())).thenReturn(null);
      Optional<ComputationConfig> configResponse = configLoader.fetchConfig("someComputationId");
      assertFalse(configResponse.isPresent());
    }
  
    @Test
    public void testGetComputationConfig_errorOnNoComputationConfig() {
      StreamingApplianceComputationConfigFetcher configLoader =
          createStreamingApplianceConfigLoader();
      when(mockWindmillServer.getConfig(any()))
          .thenReturn(Windmill.GetConfigResponse.newBuilder().build());
      assertThrows(NoSuchElementException.class, () -> configLoader.fetchConfig("someComputationId"));
    }
  
    @Test
    public void testGetComputationConfig_onFetchConfigError() {
      StreamingApplianceComputationConfigFetcher configLoader =
          createStreamingApplianceConfigLoader();
      RuntimeException e = new RuntimeException("something bad happened.");
      when(mockWindmillServer.getConfig(any())).thenThrow(e);
      Throwable fetchConfigError =
          assertThrows(RuntimeException.class, () -> configLoader.fetchConfig("someComputationId"));
      assertThat(fetchConfigError).isSameInstanceAs(e);
    }
  
    private StreamingApplianceComputationConfigFetcher createStreamingApplianceConfigLoader() {
      return new StreamingApplianceComputationConfigFetcher(
          mockWindmillServer::getConfig,
          new FixedGlobalConfigHandle(StreamingGlobalConfig.builder().build()));
    }
  }
  