@SchedulerLock基于 redis 配置

SchedulerLock的作用，确保任务在同一时刻最多执行一次。如果一个任务正在一个节点上执行，则它将获得一个锁，该锁将阻止从另一个节点（或线程）执行同一任务。如果一个任务已经在一个节点上执行，则在其他节点上的执行不会等待，只需跳过它即可 。
ShedLock使用Mongo，JDBC数据库，Redis，Hazelcast，ZooKeeper或其他外部存储进行协调，即通过外部存储来实现锁机制；

1. maven 引入依赖

 <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-redis-spring</artifactId>
            <version>2.3.0</version>
        </dependency>     

3. 配置 redis信息 格式不要错 若用keewidb 关键字也需要用redis .

spring:
  profiles: prod
  redis:
    host:  
    port: 
    password: 
    connectTimeout: 2000
    soTimeout: 2000
    jedis:
      pool:
        max-idle: 30
        min-idle: 20
        max-wait: -1
        max-active: 30
        minEvictableIdleTimeMillis: 600000
        time-between-eviction-runs: 300000

1. redisson 单例配置

2. `@Configuration
   public class RedissonConfig {

   @Value(“$spring.keewidb.host")privateStringhost;@Value("${spring.keewidb.port}”)
   private String port;
   @Value(“${spring.keewidb.password}”)
   private String password;

   @Bean(destroyMethod=“shutdown”)
   public RedissonClient redissonClient() throws IOException {
   Config config = new Config();
   SingleServerConfig singleServerConfig = config.useSingleServer().setAddress(“redis://”+host+“:”+port);

   if (StringUtils.isNotEmpty(password)) {
       singleServerConfig.setPassword(password);
   }
   System.out.println("redisson: "+config.getTransportMode());
   return Redisson.create(config);
   

   }
   }`

3. ScheduledLockConfig 配置

4. `@Configuration
   @EnableScheduling
   @EnableSchedulerLock(defaultLockAtMostFor = “PT10M”)
   public class ScheduledLockConfig {
   @Value(“${spring.profiles}”)
   private String env;

   @Bean
   public LockProvider lockProvider(RedisConnectionFactory connectionFactory) {
   return new RedisLockProvider(connectionFactory,env);
   }

   @Bean
   public ScheduledLockConfiguration scheduledLockConfiguration(LockProvider lockProvider) {
   return ScheduledLockConfigurationBuilder.withLockProvider(lockProvider)
   .withPoolSize(10)
   .withDefaultLockAtMostFor(Duration.ofMinutes(10)).build();
   }
   }
   `

5. 设置定时任务（注解）

6. @Scheduled(cron = "10 1 10 * * ?") @SchedulerLock(name = "lock", lockAtLeastForString = "PT1M", lockAtMostForString = "PT5M") public void checkEquipmentNumTasks() {}