/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    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 org.apache.ibatis.submitted.blocking_cache;
  
  import java.io.Reader;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  import org.apache.ibatis.BaseDataTest;
  import org.apache.ibatis.io.Resources;
  import org.apache.ibatis.session.SqlSession;
  import org.apache.ibatis.session.SqlSessionFactory;
  import org.apache.ibatis.session.SqlSessionFactoryBuilder;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  // issue #524
  class BlockingCacheTest {
  
    private static SqlSessionFactory sqlSessionFactory;
  
    @BeforeEach
    void setUp() throws Exception {
      // create a SqlSessionFactory
      try (Reader reader = Resources.getResourceAsReader("org/apache/ibatis/submitted/blocking_cache/mybatis-config.xml")) {
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
      }
  
      // populate in-memory database
      BaseDataTest.runScript(sqlSessionFactory.getConfiguration().getEnvironment().getDataSource(),
              "org/apache/ibatis/submitted/blocking_cache/CreateDB.sql");
    }
  
    @Test
    void testBlockingCache() {
      ExecutorService defaultThreadPool = Executors.newFixedThreadPool(2);
  
      long init = System.currentTimeMillis();
  
      for (int i = 0; i < 2; i++) {
        defaultThreadPool.execute(this::accessDB);
      }
  
      defaultThreadPool.shutdown();
  
      while (!defaultThreadPool.isTerminated()) {
      }
  
      long totalTime = System.currentTimeMillis() - init;
      Assertions.assertTrue(totalTime > 1000);
    }
  
    private void accessDB() {
      try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
        PersonMapper pm = sqlSession.getMapper(PersonMapper.class);
        pm.findAll();
        try {
          Thread.sleep(500);
        } catch (InterruptedException e) {
          Assertions.fail(e.getMessage());
        }
      }
    }
  
    @Test
    void ensureLockIsAcquiredBeforePut() {
      try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
        PersonMapper mapper = sqlSession.getMapper(PersonMapper.class);
        mapper.delete(-1);
        mapper.findAll();
        sqlSession.commit();
      }
    }
  
    @Test
    void ensureLockIsReleasedOnRollback() {
      try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
        PersonMapper mapper = sqlSession.getMapper(PersonMapper.class);
        mapper.delete(-1);
        mapper.findAll();
        sqlSession.rollback();
      }
      try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
        PersonMapper mapper = sqlSession.getMapper(PersonMapper.class);
        mapper.findAll();
     }
   }
 }