@Retryable @backoff @recover retry the use of annotations

@Retryable Note the functions of each parameter as follows

Use scenarios ：

 Handle RetryableException.class abnormal , If it throws RetryableException.class abnormal (value = RetryableException.class), Then start the retry mechanism .
 The maximum number of retries is 5 Time (maxAttempts = 5), The first is 100 millisecond .
 Every subsequent retry is the previous 1.5 times (Backoff(delay = 100L, multiplier = 1.5))

@Backoff Note the functions of each parameter as follows

Be careful ：

In the use of @Retryable and @Recover When the annotation , There are several points to pay attention to ：
First , You want to add maven rely on
<dependency>
   <groupId>org.springframework.retry</groupId>
  <artifactId>spring-retry</artifactId>
</dependency>
And add @EnableRetry Annotation makes @Retryable and @Recover Annotations to take effect .
in addition @Retryable and @Recover The method of modification should be in the same class , And be @Retryable The marked method cannot have a return value , such Recover The method works .
Last , because @Retryable Annotations are implemented through facets , So we should avoid @Retryable The caller and callee of the annotated method are in the same class , Because it will make @Retryable Note invalid
 

Examples ：

    @ApiOperation(" Test retry ")
    @PostMapping("/testRetry")
    public XXFResponseResult<Void> testRetry(){

        recordService.testRetry();
        return new XXFResponseResult<>();
    }

   void testRetry();

    @Retryable(value = {RetryException.class},// Specifies the exception that occurred to try again 
            maxAttempts=3,                   // Retry count , Default is 3
            backoff = @Backoff(value = 2000))// Delay milliseconds per retry 
    @Override
    public void testRetry() {
        log.info("retry start");
        throw new RetryException("retry fail");
    }

    @Recover
    public void recover (RetryException e) {
        log.info("recovery,{}",e.getMessage());

    }