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 com.datastax.oss.driver.internal.core.loadbalancing;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.ArgumentMatchers.eq;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.reset;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.api.core.loadbalancing.NodeDistance;
  import com.datastax.oss.driver.api.core.loadbalancing.NodeDistanceEvaluator;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableMap;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableSet;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import java.util.UUID;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.mockito.Mock;
  import org.mockito.junit.MockitoJUnitRunner;
  
  // TODO fix unnecessary stubbing of config option in parent class (and stop using "silent" runner)
  @RunWith(MockitoJUnitRunner.Silent.class)
  public class BasicLoadBalancingPolicyEventsTest extends LoadBalancingPolicyTestBase {
  
    @Mock private NodeDistanceEvaluator nodeDistanceEvaluator;
  
    private BasicLoadBalancingPolicy policy;
  
    @Before
    @Override
    public void setup() {
      super.setup();
      when(context.getNodeDistanceEvaluator(DriverExecutionProfile.DEFAULT_NAME))
          .thenReturn(nodeDistanceEvaluator);
      when(metadataManager.getContactPoints()).thenReturn(ImmutableSet.of(node1));
      policy = createAndInitPolicy();
      reset(distanceReporter);
    }
  
    @Test
    public void should_remove_down_node_from_live_set() {
      // When
      policy.onDown(node2);
  
      // Then
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1);
      verify(distanceReporter, never()).setDistance(eq(node2), any(NodeDistance.class));
      // should have been called only once, during initialization, but not during onDown
      verify(nodeDistanceEvaluator).evaluateDistance(node2, "dc1");
    }
  
    @Test
    public void should_remove_removed_node_from_live_set() {
      // When
      policy.onRemove(node2);
  
      // Then
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1);
      verify(distanceReporter, never()).setDistance(eq(node2), any(NodeDistance.class));
      // should have been called only once, during initialization, but not during onRemove
      verify(nodeDistanceEvaluator).evaluateDistance(node2, "dc1");
    }
  
    @Test
    public void should_set_added_node_to_local() {
      // When
      policy.onAdd(node3);
  
      // Then
      verify(distanceReporter).setDistance(node3, NodeDistance.LOCAL);
      verify(nodeDistanceEvaluator).evaluateDistance(node3, "dc1");
      // Not added to the live set yet, we're waiting for the pool to open
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2);
    }
  
    @Test
    public void should_ignore_added_node_when_filtered() {
      // Given
      when(nodeDistanceEvaluator.evaluateDistance(node3, "dc1")).thenReturn(NodeDistance.IGNORED);
  
      // When
      policy.onAdd(node3);
  
      // Then
      verify(distanceReporter).setDistance(node3, NodeDistance.IGNORED);
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2);
    }
  
    @Test
    public void should_ignore_added_node_when_remote_dc() {
      // Given
      when(node3.getDatacenter()).thenReturn("dc2");
  
      // When
      policy.onAdd(node3);
  
      // Then
      verify(distanceReporter).setDistance(node3, NodeDistance.IGNORED);
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2);
      assertThat(policy.getLiveNodes().dc("dc2")).isEmpty();
    }
  
    @Test
    public void should_add_up_node_to_live_set() {
      // When
      policy.onUp(node3);
  
      // Then
      verify(distanceReporter).setDistance(node3, NodeDistance.LOCAL);
      verify(nodeDistanceEvaluator).evaluateDistance(node3, "dc1");
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2, node3);
    }
  
    @Test
    public void should_ignore_up_node_when_filtered() {
      // Given
      when(nodeDistanceEvaluator.evaluateDistance(node3, "dc1")).thenReturn(NodeDistance.IGNORED);
  
      // When
      policy.onUp(node3);
  
      // Then
      verify(distanceReporter).setDistance(node3, NodeDistance.IGNORED);
      verify(nodeDistanceEvaluator).evaluateDistance(node3, "dc1");
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2);
    }
  
    @Test
    public void should_ignore_up_node_when_remote_dc() {
      // Given
      when(node3.getDatacenter()).thenReturn("dc2");
  
      // When
      policy.onUp(node3);
  
      // Then
      verify(distanceReporter).setDistance(node3, NodeDistance.IGNORED);
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2);
      assertThat(policy.getLiveNodes().dc("dc2")).isEmpty();
    }
  
    @NonNull
    protected BasicLoadBalancingPolicy createAndInitPolicy() {
      BasicLoadBalancingPolicy policy =
          new BasicLoadBalancingPolicy(context, DriverExecutionProfile.DEFAULT_NAME);
      policy.init(
          ImmutableMap.of(UUID.randomUUID(), node1, UUID.randomUUID(), node2), distanceReporter);
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2);
      return policy;
    }
  }
  