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.config.server.utils;
  
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
  import org.springframework.test.context.web.WebAppConfiguration;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  @RunWith(SpringJUnit4ClassRunner.class)
  @WebAppConfiguration
  public class SimpleReadWriteLockTest {
  
      @Test
      public void test_双重读锁_全部释放_加写锁() {
          SimpleReadWriteLock lock = new SimpleReadWriteLock();
          assertTrue(lock.tryReadLock());
          assertTrue(lock.tryReadLock());
  
          lock.releaseReadLock();
          lock.releaseReadLock();
  
          assertTrue(lock.tryWriteLock());
      }
  
      @Test
      public void test_加写锁() {
          SimpleReadWriteLock lock = new SimpleReadWriteLock();
          assertTrue(lock.tryWriteLock());
          lock.releaseWriteLock();
      }
  
      @Test
      public void test_双重写锁() {
          SimpleReadWriteLock lock = new SimpleReadWriteLock();
  
          assertTrue(lock.tryWriteLock());
          assertFalse(lock.tryWriteLock());
      }
  
      @Test
      public void test_先读锁后写锁() {
          SimpleReadWriteLock lock = new SimpleReadWriteLock();
  
          assertTrue(lock.tryReadLock());
          assertFalse(lock.tryWriteLock());
      }
  
      @Test
      public void test_双重读锁_释放一个_加写锁失败() {
          SimpleReadWriteLock lock = new SimpleReadWriteLock();
          assertTrue(lock.tryReadLock());
          assertTrue(lock.tryReadLock());
  
          lock.releaseReadLock();
  
          assertFalse(lock.tryWriteLock());
      }
  }
  