content: /*
   *   Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   *   Licensed 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.alibaba.nacos.client.naming.event;
  
  import com.alibaba.nacos.api.naming.listener.AbstractEventListener;
  import com.alibaba.nacos.api.naming.listener.EventListener;
  import com.alibaba.nacos.api.naming.pojo.Instance;
  import com.alibaba.nacos.api.naming.pojo.ServiceInfo;
  import com.alibaba.nacos.api.naming.selector.NamingSelector;
  import com.alibaba.nacos.client.naming.selector.DefaultNamingSelector;
  import com.alibaba.nacos.client.naming.selector.NamingSelectorFactory;
  import com.alibaba.nacos.client.naming.selector.NamingSelectorWrapper;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.concurrent.Executor;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.when;
  
  class InstancesChangeNotifierTest {
      
      private static final String EVENT_SCOPE_CASE = "scope-001";
      
      private static final String GROUP_CASE = "a";
      
      private static final String SERVICE_NAME_CASE = "b";
      
      private static final String CLUSTER_STR_CASE = "c";
      
      InstancesChangeNotifier instancesChangeNotifier;
      
      @BeforeEach
      public void setUp() {
          instancesChangeNotifier = new InstancesChangeNotifier(EVENT_SCOPE_CASE);
      }
      
      @Test
      void testRegisterListener() {
          List<String> clusters = Collections.singletonList(CLUSTER_STR_CASE);
          EventListener listener = Mockito.mock(EventListener.class);
          NamingSelector selector = NamingSelectorFactory.newClusterSelector(clusters);
          NamingSelectorWrapper wrapper = new NamingSelectorWrapper(SERVICE_NAME_CASE, GROUP_CASE, CLUSTER_STR_CASE,
                  selector, listener);
          instancesChangeNotifier.registerListener(GROUP_CASE, SERVICE_NAME_CASE, wrapper);
          List<ServiceInfo> subscribeServices = instancesChangeNotifier.getSubscribeServices();
          assertEquals(1, subscribeServices.size());
          assertEquals(GROUP_CASE, subscribeServices.get(0).getGroupName());
          assertEquals(SERVICE_NAME_CASE, subscribeServices.get(0).getName());
          assertNull(subscribeServices.get(0).getClusters());
          
          List<Instance> hosts = new ArrayList<>();
          Instance ins = new Instance();
          hosts.add(ins);
          InstancesDiff diff = new InstancesDiff();
          diff.setAddedInstances(hosts);
          InstancesChangeEvent event = new InstancesChangeEvent(EVENT_SCOPE_CASE, SERVICE_NAME_CASE, GROUP_CASE,
                  CLUSTER_STR_CASE, hosts, diff);
          assertTrue(instancesChangeNotifier.scopeMatches(event));
      }
      
      @Test
      void testDeregisterListener() {
          List<String> clusters = Collections.singletonList(CLUSTER_STR_CASE);
          EventListener listener = Mockito.mock(EventListener.class);
          NamingSelector selector = NamingSelectorFactory.newClusterSelector(clusters);
          NamingSelectorWrapper wrapper = new NamingSelectorWrapper(selector, listener);
          instancesChangeNotifier.registerListener(GROUP_CASE, SERVICE_NAME_CASE, wrapper);
          List<ServiceInfo> subscribeServices = instancesChangeNotifier.getSubscribeServices();
          assertEquals(1, subscribeServices.size());
          
          instancesChangeNotifier.deregisterListener(GROUP_CASE, SERVICE_NAME_CASE, wrapper);
          
          List<ServiceInfo> subscribeServices2 = instancesChangeNotifier.getSubscribeServices();
          assertEquals(0, subscribeServices2.size());
      }
      
      @Test
      void testIsSubscribed() {
          List<String> clusters = Collections.singletonList(CLUSTER_STR_CASE);
          EventListener listener = Mockito.mock(EventListener.class);
          NamingSelector selector = NamingSelectorFactory.newClusterSelector(clusters);
          assertFalse(instancesChangeNotifier.isSubscribed(GROUP_CASE, SERVICE_NAME_CASE));
          
          NamingSelectorWrapper wrapper = new NamingSelectorWrapper(SERVICE_NAME_CASE, GROUP_CASE, CLUSTER_STR_CASE,
                  selector, listener);
          instancesChangeNotifier.registerListener(GROUP_CASE, SERVICE_NAME_CASE, wrapper);
          assertTrue(instancesChangeNotifier.isSubscribed(GROUP_CASE, SERVICE_NAME_CASE));
      }
      
      @Test
      void testOnEvent() {
          List<String> clusters = Collections.singletonList(CLUSTER_STR_CASE);
          NamingSelector selector = NamingSelectorFactory.newClusterSelector(clusters);
          EventListener listener = Mockito.mock(EventListener.class);
          
          NamingSelectorWrapper wrapper = new NamingSelectorWrapper(SERVICE_NAME_CASE, GROUP_CASE, CLUSTER_STR_CASE,
                  selector, listener);
          instancesChangeNotifier.registerListener(GROUP_CASE, SERVICE_NAME_CASE, wrapper);
          Instance instance = new Instance();
          InstancesDiff diff = new InstancesDiff(null, Collections.singletonList(instance), null);
          instance.setClusterName(CLUSTER_STR_CASE);
          InstancesChangeEvent event1 = new InstancesChangeEvent(null, SERVICE_NAME_CASE, GROUP_CASE, CLUSTER_STR_CASE,
                  Collections.emptyList(), diff);
          instancesChangeNotifier.onEvent(event1);
          Mockito.verify(listener, times(1)).onEvent(any());
      }
      
      @Test
      void testOnEventWithoutListener() {
          InstancesChangeEvent event1 = Mockito.mock(InstancesChangeEvent.class);
          when(event1.getClusters()).thenReturn(CLUSTER_STR_CASE);
          when(event1.getGroupName()).thenReturn(GROUP_CASE);
          when(event1.getServiceName()).thenReturn(SERVICE_NAME_CASE);
          EventListener listener = Mockito.mock(EventListener.class);
          instancesChangeNotifier.registerListener(GROUP_CASE, SERVICE_NAME_CASE + "c", new NamingSelectorWrapper(
                  NamingSelectorFactory.newClusterSelector(Collections.singletonList(CLUSTER_STR_CASE)), listener));
          instancesChangeNotifier.onEvent(event1);
          Mockito.verify(listener, never()).onEvent(any());
      }
      
      @Test
      void testOnEventByExecutor() {
          AbstractEventListener listener = Mockito.mock(AbstractEventListener.class);
          Executor executor = mock(Executor.class);
          when(listener.getExecutor()).thenReturn(executor);
          
          instancesChangeNotifier.registerListener(GROUP_CASE, SERVICE_NAME_CASE,
                  new NamingSelectorWrapper(new DefaultNamingSelector(instance -> true), listener));
          InstancesDiff instancesDiff = new InstancesDiff();
          instancesDiff.setRemovedInstances(Collections.singletonList(new Instance()));
          InstancesChangeEvent event = new InstancesChangeEvent(EVENT_SCOPE_CASE, SERVICE_NAME_CASE, GROUP_CASE,
                  CLUSTER_STR_CASE, new ArrayList<>(), instancesDiff);
          instancesChangeNotifier.onEvent(event);
          Mockito.verify(executor).execute(any());
      }
      
      @Test
      void testSubscribeType() {
          assertEquals(InstancesChangeEvent.class, instancesChangeNotifier.subscribeType());
      }
  }