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.streams.processor.internals.assignment;
  
  import org.apache.kafka.streams.processor.assignment.AssignmentConfigs;
  
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.EnumSource;
  import org.mockito.junit.jupiter.MockitoExtension;
  import org.mockito.junit.jupiter.MockitoSettings;
  import org.mockito.quality.Strictness;
  
  import java.util.Collections;
  import java.util.List;
  
  import static java.util.Collections.singletonList;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  @ExtendWith(MockitoExtension.class)
  @MockitoSettings(strictness = Strictness.STRICT_STUBS)
  public class StandbyTaskAssignorFactoryTest {
      private static final long ACCEPTABLE_RECOVERY_LAG = 0L;
      private static final int MAX_WARMUP_REPLICAS = 1;
      private static final int NUMBER_OF_STANDBY_REPLICAS = 1;
      private static final long PROBING_REBALANCE_INTERVAL_MS = 60000L;
  
      enum State {
          DISABLED,
          ENABLED,
          NULL
      }
  
      private RackAwareTaskAssignor rackAwareTaskAssignor;
  
      public void setUp(final State state, final boolean needValidRack) {
          if (state == State.ENABLED || state == State.DISABLED) {
              rackAwareTaskAssignor = mock(RackAwareTaskAssignor.class);
              if (needValidRack) {
                  when(rackAwareTaskAssignor.validClientRack()).thenReturn(state.equals(State.ENABLED));
              }
          } else {
              rackAwareTaskAssignor = null;
          }
      }
  
      @ParameterizedTest
      @EnumSource(State.class)
      public void shouldReturnClientTagAwareStandbyTaskAssignorWhenRackAwareAssignmentTagsIsSet(final State state) {
          setUp(state, false);
          final StandbyTaskAssignor standbyTaskAssignor = StandbyTaskAssignorFactory.create(newAssignmentConfigs(singletonList("az")), rackAwareTaskAssignor);
          assertInstanceOf(ClientTagAwareStandbyTaskAssignor.class, standbyTaskAssignor);
          if (state != State.NULL) {
              verify(rackAwareTaskAssignor, never()).racksForProcess();
              verify(rackAwareTaskAssignor, never()).validClientRack();
          }
      }
  
      @ParameterizedTest
      @EnumSource(State.class)
      public void shouldReturnDefaultOrRackAwareStandbyTaskAssignorWhenRackAwareAssignmentTagsIsEmpty(final State state) {
          setUp(state, true);
          final StandbyTaskAssignor standbyTaskAssignor = StandbyTaskAssignorFactory.create(newAssignmentConfigs(Collections.emptyList()), rackAwareTaskAssignor);
          if (state == State.ENABLED) {
              assertInstanceOf(ClientTagAwareStandbyTaskAssignor.class, standbyTaskAssignor);
              verify(rackAwareTaskAssignor, times(1)).racksForProcess();
              verify(rackAwareTaskAssignor, times(1)).validClientRack();
          } else if (state == State.DISABLED) {
              assertInstanceOf(DefaultStandbyTaskAssignor.class, standbyTaskAssignor);
              verify(rackAwareTaskAssignor, never()).racksForProcess();
              verify(rackAwareTaskAssignor, times(1)).validClientRack();
          } else {
              assertInstanceOf(DefaultStandbyTaskAssignor.class, standbyTaskAssignor);
          }
      }
  
      private static AssignmentConfigs newAssignmentConfigs(final List<String> rackAwareAssignmentTags) {
          return new AssignmentConfigs(ACCEPTABLE_RECOVERY_LAG,
                                       MAX_WARMUP_REPLICAS,
                                       NUMBER_OF_STANDBY_REPLICAS,
                                       PROBING_REBALANCE_INTERVAL_MS,
                                       rackAwareAssignmentTags);
      }
  }