spring retry 重試機制完整例子

 public  static Boolean vpmsRetryCoupon(final String userId) {
        // 構建重試模板實例
        RetryTemplate retryTemplate = new RetryTemplate();
        // 設置重試策略，主要設置重試次數
        SimpleRetryPolicy policy = new SimpleRetryPolicy(10, Collections.<Class<? extends Throwable>, Boolean> singletonMap(Exception.class, true));
        // 設置重試回退操作策略，主要設置重試間隔時間
        FixedBackOffPolicy fixedBackOffPolicy = new FixedBackOffPolicy();
        fixedBackOffPolicy.setBackOffPeriod(100);
        retryTemplate.setRetryPolicy(policy);
        retryTemplate.setBackOffPolicy(fixedBackOffPolicy);
        // 通過RetryCallback 重試回調實例包裝正常邏輯邏輯，第一次執行和重試執行執行的都是這段邏輯
        final RetryCallback<Object, Exception> retryCallback = new RetryCallback<Object, Exception>() {
            //RetryContext 重試操作上下文約定，統一spring-try包裝
            public Object doWithRetry(RetryContext context) throws Exception {
               boolean result = pushCouponByVpmsaa(userId);
               if(!result){
                   throw new RuntimeException();//這個點特別注意，重試的根源通過Exception返回
               }
               return true;
            }
        };
        // 通過RecoveryCallback 重試流程正常結束或者達到重試上限后的退出恢復操作實例
        final RecoveryCallback<Object> recoveryCallback = new RecoveryCallback<Object>() {
            public Object recover(RetryContext context) throws Exception {
//                logger.info("正在重試發券::::::::::::"+userId);
                return null;
            }
        };
        try {
            // 由retryTemplate 執行execute方法開始邏輯執行
            retryTemplate.execute(retryCallback, recoveryCallback);
        } catch (Exception e) {
//            logger.info("發券錯誤異常========"+e.getMessage());
            e.printStackTrace();
        }
        return true;
    }

    public static void main(String[] args) {
        vpmsRetryCoupon("43333");
    }


    public static Boolean pushCouponByVpmsaa(String userId){
        Random random = new Random();
        int a= random.nextInt(10);
        System.out.println("a是"+a);
        if(a==8){
            return  true;
        }else{
            return false;
        }