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.kafka.connect.runtime;
  
  import org.apache.kafka.common.internals.Plugin;
  import org.apache.kafka.connect.connector.ConnectRecord;
  import org.apache.kafka.connect.runtime.distributed.ExtendedAssignment;
  import org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator;
  import org.apache.kafka.connect.runtime.isolation.TestPlugins;
  import org.apache.kafka.connect.storage.AppliedConnectorConfig;
  import org.apache.kafka.connect.storage.ClusterConfigState;
  import org.apache.kafka.connect.transforms.Transformation;
  import org.apache.kafka.connect.transforms.predicates.Predicate;
  import org.apache.kafka.connect.util.ConnectorTaskId;
  
  import org.mockito.Mockito;
  import org.mockito.stubbing.OngoingStubbing;
  
  import java.util.AbstractMap.SimpleEntry;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  import java.util.stream.IntStream;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  public class WorkerTestUtils {
  
      public static ClusterConfigState clusterConfigState(long offset,
                                                          int connectorNum,
                                                          int taskNum) {
          Map<String, Map<String, String>> connectorConfigs = connectorConfigs(1, connectorNum);
          Map<String, AppliedConnectorConfig> appliedConnectorConfigs = connectorConfigs.entrySet().stream()
                  .collect(Collectors.toMap(
                          Map.Entry::getKey,
                          e -> new AppliedConnectorConfig(e.getValue())
                  ));
          return new ClusterConfigState(
                  offset,
                  null,
                  connectorTaskCounts(1, connectorNum, taskNum),
                  connectorConfigs,
                  connectorTargetStates(1, connectorNum, TargetState.STARTED),
                  taskConfigs(0, connectorNum, connectorNum * taskNum),
                  Collections.emptyMap(),
                  Collections.emptyMap(),
                  appliedConnectorConfigs,
                  Collections.emptySet(),
                  Collections.emptySet());
      }
  
      public static Map<String, Integer> connectorTaskCounts(int start,
                                                             int connectorNum,
                                                             int taskCounts) {
          return IntStream.range(start, connectorNum + 1)
                  .mapToObj(i -> new SimpleEntry<>("connector" + i, taskCounts))
                  .collect(Collectors.toMap(SimpleEntry::getKey, SimpleEntry::getValue));
      }
  
      public static Map<String, Map<String, String>> connectorConfigs(int start, int connectorNum) {
          return IntStream.range(start, connectorNum + 1)
                  .mapToObj(i -> new SimpleEntry<>("connector" + i, new HashMap<String, String>()))
                  .collect(Collectors.toMap(SimpleEntry::getKey, SimpleEntry::getValue));
      }
  
      public static Map<String, TargetState> connectorTargetStates(int start,
                                                                   int connectorNum,
                                                                   TargetState state) {
          return IntStream.range(start, connectorNum + 1)
                  .mapToObj(i -> new SimpleEntry<>("connector" + i, state))
                  .collect(Collectors.toMap(SimpleEntry::getKey, SimpleEntry::getValue));
      }
  
      public static Map<ConnectorTaskId, Map<String, String>> taskConfigs(int start,
                                                                          int connectorNum,
                                                                          int taskNum) {
          return IntStream.range(start, taskNum + 1)
                  .mapToObj(i -> new SimpleEntry<>(
                          new ConnectorTaskId("connector" + i / connectorNum + 1, i),
                          new HashMap<String, String>())
                  ).collect(Collectors.toMap(SimpleEntry::getKey, SimpleEntry::getValue));
      }
  
      public static String expectedLeaderUrl(String givenLeader) {
          return "http://" + givenLeader + ":8083";
      }
  
      public static void assertAssignment(String expectedLeader,
                                          long expectedOffset,
                                          List<String> expectedAssignedConnectors,
                                          int expectedAssignedTaskNum,
                                          List<String> expectedRevokedConnectors,
                                          int expectedRevokedTaskNum,
                                          ExtendedAssignment assignment) {
          assertAssignment(false, expectedLeader, expectedOffset,
                  expectedAssignedConnectors, expectedAssignedTaskNum,
                  expectedRevokedConnectors, expectedRevokedTaskNum,
                  0,
                  assignment);
      }
  
      public static void assertAssignment(String expectedLeader,
                                          long expectedOffset,
                                          List<String> expectedAssignedConnectors,
                                          int expectedAssignedTaskNum,
                                          List<String> expectedRevokedConnectors,
                                          int expectedRevokedTaskNum,
                                          int expectedDelay,
                                          ExtendedAssignment assignment) {
          assertAssignment(false, expectedLeader, expectedOffset,
                  expectedAssignedConnectors, expectedAssignedTaskNum,
                  expectedRevokedConnectors, expectedRevokedTaskNum,
                  expectedDelay,
                  assignment);
      }
  
      public static void assertAssignment(boolean expectFailed,
                                          String expectedLeader,
                                          long expectedOffset,
                                          List<String> expectedAssignedConnectors,
                                          int expectedAssignedTaskNum,
                                          List<String> expectedRevokedConnectors,
                                          int expectedRevokedTaskNum,
                                          int expectedDelay,
                                          ExtendedAssignment assignment) {
          assertNotNull(assignment, "Assignment can't be null");
  
          assertEquals(expectFailed, assignment.failed(), "Wrong status in " + assignment);
  
          assertEquals(expectedLeader, assignment.leader(), "Wrong leader in " + assignment);
  
          assertEquals(expectedLeaderUrl(expectedLeader),
                  assignment.leaderUrl(), "Wrong leaderUrl in " + assignment);
  
          assertEquals(expectedOffset, assignment.offset(), "Wrong offset in " + assignment);
  
          assertEquals(expectedAssignedConnectors, assignment.connectors(), "Wrong set of assigned connectors in " + assignment);
  
          assertEquals(expectedAssignedTaskNum, assignment.tasks().size(),
                  "Wrong number of assigned tasks in " + assignment);
  
          assertEquals(expectedRevokedConnectors, assignment.revokedConnectors(), "Wrong set of revoked connectors in " + assignment);
  
          assertEquals(expectedRevokedTaskNum, assignment.revokedTasks().size(),
                  "Wrong number of revoked tasks in " + assignment);
  
          assertEquals(expectedDelay, assignment.delay(),
                  "Wrong rebalance delay in " + assignment);
      }
  
      public static <T, R extends ConnectRecord<R>> TransformationChain<T, R> getTransformationChain(
              RetryWithToleranceOperator<T> toleranceOperator,
              List<Object> results) {
          Transformation<R> transformation = mock(Transformation.class);
          OngoingStubbing<R> stub = when(transformation.apply(any()));
          for (Object result: results) {
              if (result instanceof Exception) {
                  stub = stub.thenThrow((Exception) result);
              } else {
                  stub = stub.thenReturn((R) result);
              }
          }
          return buildTransformationChain(transformation, toleranceOperator);
      }
  
      @SuppressWarnings("unchecked")
      public static <T, R extends ConnectRecord<R>> TransformationChain<T, R> buildTransformationChain(
              Transformation<R> transformation,
              RetryWithToleranceOperator<T> toleranceOperator) {
          Predicate<R> predicate = mock(Predicate.class);
          when(predicate.test(any())).thenReturn(true);
          Plugin<Predicate<R>> predicatePlugin = mock(Plugin.class);
          when(predicatePlugin.get()).thenReturn(predicate);
          Plugin<Transformation<R>> transformationPlugin = mock(Plugin.class);
          when(transformationPlugin.get()).thenReturn(transformation);
          TransformationStage<R> stage = new TransformationStage<>(
                  predicatePlugin,
                  "testPredicate",
                  null,
                  false,
                  transformationPlugin,
                  "testTransformation",
                  null,
                  TestPlugins.noOpLoaderSwap());
          TransformationChain<T, R> realTransformationChainRetriableException = new TransformationChain<>(List.of(stage), toleranceOperator);
          return Mockito.spy(realTransformationChainRetriableException);
      }
  }
  