Spring Cloud分布式定时器之ShedLock的实现

 <!--shedlock-->
    <dependency>
      <groupId>net.javacrumbs.shedlock</groupId>
      <artifactId>shedlock-spring</artifactId>
      <version>2.2.0</version>
    </dependency>
    <dependency>
      <groupId>net.javacrumbs.shedlock</groupId>
      <artifactId>shedlock-provider-jdbc-template</artifactId>
      <version>2.2.0</version>
    </dependency>

@EnableScheduling
@EnableSchedulerLock(defaultLockAtMostFor = "PT30S")
public class OneStopServiceApplication {
  public static void main(String[] args) {
    SpringApplication.run(OneStopServiceApplication.class, args);
  }

}

@Configuration
public class ScheduledLockConfig {
  @Bean
  public LockProvider lockProvider(DataSource dataSource) {
    //自定义表名
    return new JdbcTemplateLockProvider(dataSource,"ccsy_shedlock");
  }
}

@Component
public class HourTask {
  /**
   * 最小锁定时间,一般设置成定时任务小一点
   */
  private static final int MIN_LOCK_TIME = 1000;//单位毫秒
  /**
   * 最大锁定时间,一般设置成比正常执行时间长的值
   */
  private static final int MAX_LOCK_TIME = 1000 * 2;//单位毫秒

  
  @Scheduled(cron = "0/1 * * * * ? ")
  @SchedulerLock(name = "测试", lockAtMostFor = MAX_LOCK_TIME, lockAtLeastFor = MIN_LOCK_TIME)
  public void visitCountTaskByTwoHour() {
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    System.out.println("现在时间是" + format.format(new Date())+ Thread.currentThread().getName());
  }
}

CREATE TABLE ccsy_shedlock (
 NAME VARCHAR ( 64 ),
 lock_until TIMESTAMP ( 3 ) NULL,
 locked_at TIMESTAMP ( 3 ) NULL,
locked_by VARCHAR ( 255 ),
PRIMARY KEY ( NAME ))