content: /*
   * Copyright 1999-2023 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.common.notify;
  
  import com.alibaba.nacos.common.notify.listener.Subscriber;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mock;
  import org.mockito.junit.jupiter.MockitoExtension;
  
  import java.util.concurrent.Executor;
  import java.util.concurrent.TimeUnit;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.doThrow;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.reset;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  @ExtendWith(MockitoExtension.class)
  class DefaultPublisherTest {
      
      private DefaultPublisher publisher;
      
      @Mock
      private Subscriber<MockEvent> subscriber;
      
      @BeforeEach
      void setUp() throws Exception {
          publisher = new DefaultPublisher();
          publisher.init(MockEvent.class, 1);
      }
      
      @AfterEach
      void tearDown() throws Exception {
          try {
              publisher.shutdown();
          } catch (Exception ignored) {
          }
      }
      
      @Test
      void testInitWithIllegalSize() {
          publisher.shutdown();
          publisher = new DefaultPublisher();
          publisher.init(MockEvent.class, -1);
          assertTrue(publisher.isInitialized());
      }
      
      @Test
      void testCheckIsStart() {
          assertThrows(IllegalStateException.class, () -> {
              publisher.shutdown();
              publisher = new DefaultPublisher();
              publisher.checkIsStart();
          });
      }
      
      @Test
      void testCurrentEventSize() {
          assertEquals(0, publisher.currentEventSize());
          publisher.publish(new MockEvent());
          assertEquals(1, publisher.currentEventSize());
      }
      
      @Test
      void testRemoveSubscriber() {
          publisher.addSubscriber(subscriber);
          assertEquals(1, publisher.getSubscribers().size());
          publisher.removeSubscriber(subscriber);
          assertEquals(0, publisher.getSubscribers().size());
      }
      
      @Test
      void publishEventWhenQueueFull() {
          // Stop the publisher thread to mock queue full.
          publisher.shutdown();
          publisher.publish(new MockEvent());
          // Test throw event when no subscribers.
          publisher.publish(new MockEvent());
          verify(subscriber, never()).onEvent(any(MockEvent.class));
          // Add subscriber to test
          publisher.addSubscriber(subscriber);
          publisher.publish(new MockEvent());
          // Test scopeMatches not pass
          verify(subscriber, never()).onEvent(any(MockEvent.class));
          // Test scopeMatches pass
          when(subscriber.scopeMatches(any(MockEvent.class))).thenReturn(true);
          publisher.publish(new MockEvent());
          verify(subscriber).onEvent(any(MockEvent.class));
      }
      
      @Test
      void publishEventQueueNotFull() throws InterruptedException {
          when(subscriber.scopeMatches(any(MockEvent.class))).thenReturn(true);
          MockEvent mockEvent = new MockEvent();
          // Make sure Publisher entry waiting subscribers.
          TimeUnit.MILLISECONDS.sleep(500);
          publisher.addSubscriber(subscriber);
          publisher.publish(mockEvent);
          // Make sure Publisher find the subscribers.
          TimeUnit.MILLISECONDS.sleep(600);
          verify(subscriber).onEvent(mockEvent);
          // Test subscriber ignore expired event.
          publisher.publish(new MockEvent());
          TimeUnit.MILLISECONDS.sleep(100);
          reset(subscriber);
          when(subscriber.scopeMatches(any(MockEvent.class))).thenReturn(true);
          when(subscriber.ignoreExpireEvent()).thenReturn(true);
          publisher.publish(mockEvent);
          TimeUnit.MILLISECONDS.sleep(100);
          verify(subscriber, never()).onEvent(mockEvent);
      }
      
      @Test
      void testHandleEventWithThrowable() throws InterruptedException {
          when(subscriber.scopeMatches(any(MockEvent.class))).thenReturn(true);
          doThrow(new RuntimeException("test")).when(subscriber).onEvent(any(MockEvent.class));
          publisher.addSubscriber(subscriber);
          publisher.publish(new MockEvent());
          TimeUnit.MILLISECONDS.sleep(1100);
          verify(subscriber).onEvent(any(MockEvent.class));
      }
      
      @Test
      void testHandleEventWithExecutor() throws InterruptedException {
          Executor executor = mock(Executor.class);
          when(subscriber.scopeMatches(any(MockEvent.class))).thenReturn(true);
          when(subscriber.executor()).thenReturn(executor);
          publisher.addSubscriber(subscriber);
          publisher.publish(new MockEvent());
          TimeUnit.MILLISECONDS.sleep(1100);
          verify(executor).execute(any(Runnable.class));
      }
      
      @Test
      void testReceiveEventWithException() throws InterruptedException {
          Executor executor = mock(Executor.class);
          when(subscriber.scopeMatches(any(MockEvent.class))).thenReturn(true);
          when(subscriber.executor()).thenThrow(new RuntimeException("test"));
          publisher.addSubscriber(subscriber);
          publisher.publish(new MockEvent());
          TimeUnit.MILLISECONDS.sleep(1100);
          verify(executor, never()).execute(any(Runnable.class));
      }
      
      private static class MockEvent extends Event {
          
          private static final long serialVersionUID = -4081244883427311461L;
      }
  }