SpringCloud-Sentinel的服务熔断(Day15)

我们当前没有配置对服务的降级和限流，所以如果当接口出现异常时就会直接将异常打印到前端。

我们当前配置对服务的异常兜底的处理方法，当接口出现异常或者超时等就会直接把我们指定的异常方法打印到前端。

@RequestMapping("/consumer/fallback/{id}")
@SentinelResource(value = "fallback", fallback = "handlerFallback" )
public CommonResult fallback(@PathVariable Long id) {
    CommonResult result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);
    if (id == 4) {
        throw new IllegalArgumentException ("IllegalArgumentException,非法参数异常....");
    }else if (result.getData() == null) {
        throw new NullPointerException ("NullPointerException,该ID没有对应记录,空指针异常");
    }
    return result;
}

//本例是fallback
public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {
    Payment payment = new Payment(id,"null");
    return new CommonResult<>(444,"兜底异常handlerFallback,exception内容  "+e.getMessage(),payment);
}

我们当前配置对服务的限流规则的处理方法，当接口出现被限流或者服务降级就直接把我们指定的异常方法打印到前端。

@RequestMapping("/consumer/fallback/{id}")
@SentinelResource(value = "fallback", blockHandler = "blockHandler" )
public CommonResult fallback(@PathVariable Long id) {
    CommonResult result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);
    if (id == 4) {
        throw new IllegalArgumentException ("IllegalArgumentException,非法参数异常....");
    }else if (result.getData() == null) {
        throw new NullPointerException ("NullPointerException,该ID没有对应记录,空指针异常");
    }
    return result;
}

//本例是blockHandler
public CommonResult blockHandler(@PathVariable  Long id, BlockException blockException) {
    Payment payment = new Payment(id,"null");
    return new CommonResult<>(445,"blockHandler-sentinel限流,无此流水: blockException  "+blockException.getMessage(),payment);
}

我们当前配置对服务的限流规则以及异常超时的处理方法，当接口出现被限流或者服务降级以及接口异常或超时就直接把我们相应指定的异常方法打印到前端。

@RequestMapping("/consumer/fallback/{id}")
@SentinelResource(value = "fallback",fallback = "handlerFallback",blockHandler = "blockHandler")
public CommonResult fallback(@PathVariable Long id) {
    CommonResult result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);
    if (id == 4) {
        throw new IllegalArgumentException ("IllegalArgumentException,非法参数异常....");
    }else if (result.getData() == null) {
        throw new NullPointerException ("NullPointerException,该ID没有对应记录,空指针异常");
    }
    return result;
}

//本例是blockHandler
public CommonResult blockHandler(@PathVariable  Long id, BlockException blockException) {
    Payment payment = new Payment(id,"null");
    return new CommonResult<>(445,"blockHandler-sentinel限流,无此流水: blockException  "+blockException.getMessage(),payment);
}

//本例是fallback
public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {
    Payment payment = new Payment(id,"null");
    return new CommonResult<>(444,"兜底异常handlerFallback,exception内容  "+e.getMessage(),payment);
}

我们配置了exceptionsToIgnore的参数，即忽略这种异常，当接口报出IllegalArgumentException异常时将直接返回给前端，不返回兜底的方法了。

@RequestMapping("/consumer/fallback/{id}")
@SentinelResource(value = "fallback",fallback = "handlerFallback",blockHandler = "blockHandler", exceptionsToIgnore = {IllegalArgumentException.class} )
public CommonResult fallback(@PathVariable Long id) {
    CommonResult result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id,CommonResult.class,id);
    if (id == 4) {
        throw new IllegalArgumentException ("IllegalArgumentException,非法参数异常....");
    }else if (result.getData() == null) {
        throw new NullPointerException ("NullPointerException,该ID没有对应记录,空指针异常");
    }
    return result;
}

//本例是blockHandler
public CommonResult blockHandler(@PathVariable  Long id, BlockException blockException) {
    Payment payment = new Payment(id,"null");
    return new CommonResult<>(445,"blockHandler-sentinel限流,无此流水: blockException  "+blockException.getMessage(),payment);
}

//本例是fallback
public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {
    Payment payment = new Payment(id,"null");
    return new CommonResult<>(444,"兜底异常handlerFallback,exception内容  "+e.getMessage(),payment);
}