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.utils;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.slf4j.Logger;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  class ThreadUtilsTest {
      
      private ExecutorService executorService;
      
      @BeforeEach
      void setUp() throws Exception {
          System.setProperty("nacos.common.processors", "2");
          executorService = Executors.newFixedThreadPool(1);
      }
      
      @AfterEach
      void tearDown() throws Exception {
          System.setProperty("nacos.common.processors", "");
          ThreadUtils.shutdownThreadPool(executorService);
      }
      
      @Test
      void testLatchAwait() {
          final CountDownLatch countDownLatch = new CountDownLatch(1);
          long currentTime = System.currentTimeMillis();
          executorService.execute(() -> {
              ThreadUtils.sleep(100);
              ThreadUtils.countDown(countDownLatch);
          });
          ThreadUtils.latchAwait(countDownLatch);
          assertTrue(System.currentTimeMillis() - currentTime >= 100);
      }
      
      @Test
      void testLatchAwaitForTimeout() {
          final CountDownLatch countDownLatch = new CountDownLatch(1);
          long currentTime = System.currentTimeMillis();
          ThreadUtils.latchAwait(countDownLatch, 50, TimeUnit.MILLISECONDS);
          assertTrue(System.currentTimeMillis() - currentTime >= 50);
          
      }
      
      @Test
      void testGetSuitableThreadCount() {
          assertEquals(4, ThreadUtils.getSuitableThreadCount());
          assertEquals(8, ThreadUtils.getSuitableThreadCount(3));
      }
      
      @Test
      void testShutdownThreadPoolWithInterruptedException() throws InterruptedException {
          ExecutorService executor = mock(ExecutorService.class);
          when(executor.awaitTermination(100, TimeUnit.MILLISECONDS)).thenThrow(new InterruptedException());
          ThreadUtils.shutdownThreadPool(executor);
          verify(executor, times(4)).shutdownNow();
      }
      
      @Test
      void testShutdownThreadPoolWithOtherException() throws InterruptedException {
          ExecutorService executor = mock(ExecutorService.class);
          Logger logger = mock(Logger.class);
          Throwable cause = new RuntimeException();
          when(executor.awaitTermination(100, TimeUnit.MILLISECONDS)).thenThrow(cause);
          ThreadUtils.shutdownThreadPool(executor, logger);
          verify(executor).shutdownNow();
          verify(logger, times(3)).error("ThreadPoolManager shutdown executor has error : ", cause);
      }
      
      @Test
      void testAddShutdownHook() {
          Runnable shutdownHook = () -> {
          };
          ThreadUtils.addShutdownHook(shutdownHook);
          // It seems no way to check it.
      }
  }