基于SpringBoot AOP面向切面编程实现Redis分布式锁
基于SpringBoot AOP面向切面编程实现Redis分布式锁
基于SpringBoot AOP面向切面编程实现Redis分布式锁
锁定的目标是确保相互排斥其访问的资源。实际上,此资源通常是字符串。使用redis实现锁主要是将资源放入redis中并利用其原子性。当其他线程访问时,如果Redis中已经存在此资源,则不允许进行某些后续操作。
Spring Boot通过RedisTemplate使用Redis,在实际使用过程中,分布式锁可以在封装后在方法级别使用,这样使用起来就更方便了,无需到处获取和释放锁。
@Target({ElementType.METHOD}) @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface RedisLock { //锁定的资源,redis的键 String value() default "default"; //锁定保持时间(以毫秒为单位) long keepMills() default 30000; //失败时执行的操作 LockFailAction action() default LockFailAction.CONTINUE; //失败时执行的操作--枚举 public enum LockFailAction{ GIVEUP, CONTINUE; } //重试的间隔 long sleepMills() default 200; //重试次数 int retryTimes() default 5; }
@Configuration @AutoConfigureAfter(RedisAutoConfiguration.class) public class DistributedLockAutoConfiguration { @Bean @ConditionalOnBean(RedisTemplate.class) public DistributedLock redisDistributedLock(RedisTemplate redisTemplate){ return new RedisDistributedLock(redisTemplate); } }
@Aspect @Configuration @ConditionalOnClass(DistributedLock.class) @AutoConfigureAfter(DistributedLockAutoConfiguration.class) public class DistributedLockAspectConfiguration { private final Logger logger = LoggerFactory.getLogger(DistributedLockAspectConfiguration.class); @Autowired private DistributedLock distributedLock; @Pointcut("@annotation(com.itopener.lock.redis.spring.boot.autoconfigure.annotations.RedisLock)") private void lockPoint(){ } @Around("lockPoint()") public Object around(ProceedingJoinPoint pjp) throws Throwable{ Method method = ((MethodSignature) pjp.getSignature()).getMethod(); RedisLock redisLock = method.getAnnotation(RedisLock.class); String key = redisLock.value(); if(StringUtils.isEmpty(key)){ Object/[/] args = pjp.getArgs(); key = Arrays.toString(args); } int retryTimes = redisLock.action().equals(LockFailAction.CONTINUE) ? redisLock.retryTimes() : 0; //获取分布式锁 boolean lock = distributedLock.lock(key, redisLock.keepMills(), retryTimes, redisLock.sleepMills()); if(!lock) { logger.debug("get lock failed : " + key); return null; } //执行方法之后,释放分布式锁 logger.debug("get lock success : " + key); try { return pjp.proceed(); //执行方法 } catch (Exception e) { logger.error("execute locked method occured an exception", e); } finally { boolean releaseResult = distributedLock.releaseLock(key); //释放分布式锁 logger.debug("release lock :" + key + (releaseResult ?" success" : "failed")); } return null; } }
@RedisLock(value="your-custom-service-redis-key") public void serviceMethod(){ //正常写方法实现 }
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