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.cloudstack.mom.inmemory;
  
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  
  import java.util.UUID;
  
  import org.apache.cloudstack.framework.events.Event;
  import org.apache.cloudstack.framework.events.EventBusException;
  import org.apache.cloudstack.framework.events.EventSubscriber;
  import org.apache.cloudstack.framework.events.EventTopic;
  import org.junit.Test;
  
  import com.cloud.utils.UuidUtils;
  
  public class InMemoryEventBusTest {
  
      @Test
      public void testConfigure() throws Exception {
          String name = "test001";
  
          InMemoryEventBus bus = new InMemoryEventBus();
          boolean success = bus.configure(name, null);
  
          assertTrue(success);
          assertTrue(name.equals(bus.getName()));
      }
  
      @Test
      public void testSubscribe() throws Exception {
          EventTopic topic = mock(EventTopic.class);
          EventSubscriber subscriber = mock(EventSubscriber.class);
  
          InMemoryEventBus bus = new InMemoryEventBus();
  
          UUID uuid = bus.subscribe(topic, subscriber);
          assertNotNull(uuid);
  
          String uuidStr = uuid.toString();
          assertTrue(UuidUtils.isUuid(uuidStr));
          assertTrue(bus.totalSubscribers() == 1);
  
          bus.unsubscribe(uuid, subscriber);
          assertTrue(bus.totalSubscribers() == 0);
      }
  
      @Test(expected = EventBusException.class)
      public void testSubscribeFailTopic() throws Exception {
          EventSubscriber subscriber = mock(EventSubscriber.class);
  
          InMemoryEventBus bus = new InMemoryEventBus();
  
          bus.subscribe(null, subscriber);
      }
  
      @Test(expected = EventBusException.class)
      public void testSubscribeFailSubscriber() throws Exception {
          EventTopic topic = mock(EventTopic.class);
  
          InMemoryEventBus bus = new InMemoryEventBus();
  
          bus.subscribe(topic, null);
      }
  
      @Test
      public void testUnsubscribe() throws Exception {
          EventTopic topic = mock(EventTopic.class);
          EventSubscriber subscriber = mock(EventSubscriber.class);
  
          InMemoryEventBus bus = new InMemoryEventBus();
  
          UUID uuid = bus.subscribe(topic, subscriber);
          assertNotNull(uuid);
  
          String uuidStr = uuid.toString();
  
          assertTrue(UuidUtils.isUuid(uuidStr));
          assertTrue(bus.totalSubscribers() == 1);
          //
          bus.unsubscribe(uuid, subscriber);
          assertTrue(bus.totalSubscribers() == 0);
      }
  
      @Test(expected = EventBusException.class)
      public void testUnsubscribeFailEmpty() throws Exception {
          UUID uuid = UUID.randomUUID();
  
          InMemoryEventBus bus = new InMemoryEventBus();
          bus.unsubscribe(uuid, null);
      }
  
      @Test(expected = EventBusException.class)
      public void testUnsubscribeFailNull() throws Exception {
          InMemoryEventBus bus = new InMemoryEventBus();
          bus.unsubscribe(null, null);
      }
  
      @Test(expected = EventBusException.class)
      public void testUnsubscribeFailWrongUUID() throws Exception {
          EventSubscriber subscriber = mock(EventSubscriber.class);
          InMemoryEventBus bus = new InMemoryEventBus();
          UUID uuid = UUID.randomUUID();
  
          bus.unsubscribe(uuid, subscriber);
      }
  
      @Test
      public void testPublish() throws Exception {
          EventTopic topic = mock(EventTopic.class);
          EventSubscriber subscriber = mock(EventSubscriber.class);
          Event event = mock(Event.class);
  
          InMemoryEventBus bus = new InMemoryEventBus();
  
          UUID uuid = bus.subscribe(topic, subscriber);
          assertNotNull(uuid);
  
          String uuidStr = uuid.toString();
          assertTrue(UuidUtils.isUuid(uuidStr));
          assertTrue(bus.totalSubscribers() == 1);
  
          bus.publish(event);
  
          verify(subscriber, times(1)).onEvent(event);
  
          bus.unsubscribe(uuid, subscriber);
          assertTrue(bus.totalSubscribers() == 0);
      }
  
      @Test
      public void testPublishEmpty() throws Exception {
          EventSubscriber subscriber = mock(EventSubscriber.class);
          Event event = mock(Event.class);
  
          InMemoryEventBus bus = new InMemoryEventBus();
          bus.publish(event);
  
          verify(subscriber, times(0)).onEvent(event);
      }
  }
  