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.context.bus;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import com.datastax.oss.driver.internal.core.context.EventBus;
  import java.util.HashMap;
  import java.util.Map;
  import org.junit.Before;
  import org.junit.Test;
  
  public class EventBusTest {
  
    private EventBus bus;
    private Map<String, ParentEvent> results;
    private ChildEvent event = new ChildEvent();
  
    @Before
    public void setup() {
      bus = new EventBus("test");
      results = new HashMap<>();
    }
  
    @Test
    public void should_notify_registered_listeners() {
      // Given
      bus.register(ChildEvent.class, (e) -> results.put("listener1", e));
      bus.register(ChildEvent.class, (e) -> results.put("listener2", e));
  
      // When
      bus.fire(event);
  
      // Then
      assertThat(results)
          .hasSize(2)
          .containsEntry("listener1", event)
          .containsEntry("listener2", event);
    }
  
    @Test
    public void should_unregister_listener() {
      // Given
      Object key1 = bus.register(ChildEvent.class, (e) -> results.put("listener1", e));
      bus.register(ChildEvent.class, (e) -> results.put("listener2", e));
      bus.unregister(key1, ChildEvent.class);
  
      // When
      bus.fire(event);
  
      // Then
      assertThat(results).hasSize(1).containsEntry("listener2", event);
    }
  
    @Test
    public void should_use_exact_class() {
      // Given
      bus.register(ChildEvent.class, (e) -> results.put("listener1", e));
      bus.register(ParentEvent.class, (e) -> results.put("listener2", e));
  
      // When
      bus.fire(event);
  
      // Then
      assertThat(results).hasSize(1).containsEntry("listener1", event);
  
      // When
      results.clear();
      ParentEvent parentEvent = new ParentEvent();
      bus.fire(parentEvent);
  
      // Then
      assertThat(results).hasSize(1).containsEntry("listener2", parentEvent);
    }
  
    private static class ParentEvent {}
  
    private static class ChildEvent extends ParentEvent {}
  }
  