Sentinelresource annotation details

SentinelResource annotation Attribute summary .

> This article is based on Sentinel 1.6.2, theoretical support 1.4.0+

attribute	effect	Whether must
value	Resource name	yes
entryType	entry type , Mark the direction of the flow , Value IN/OUT, The default is OUT	no
blockHandler	Handle BlockException The function name of . Function requirements ： 1. Must be  public 2. The return type is the same as the original method 3. The parameter type needs to match the original method , And add... At the end  BlockException  Parameters of type . 4. By default, it needs to be in the same class as the original method . If you want to use functions of other classes , Configurable  blockHandlerClass , And designate blockHandlerClass The method inside .	no
blockHandlerClass	Deposit blockHandler Class . The corresponding processing function must be static modification , Otherwise, it cannot be parsed , Other requirements ： Same as blockHandler.	no
fallback	Used to provide... When an exception is thrown fallback Processing logic .fallback Functions can be used for all types of exceptions （ except  exceptionsToIgnore  The types of exceptions excluded ） To deal with . Function requirements ： 1. The return type is the same as the original method 2. The parameter type needs to match the original method ,Sentinel 1.6 Start , Or at the end of the method Add  Throwable  Parameters of type . 3. By default, it needs to be in the same class as the original method . If you want to use functions of other classes , Configurable  fallbackClass , And designate fallbackClass The method inside .	no
fallbackClass【1.6】	Deposit fallback Class . The corresponding processing function must be static modification , Otherwise, it cannot be parsed , Other requirements ： Same as fallback.	no
defaultFallback【1.6】	For general purpose fallback Logic . Default fallback Functions can be used for all types of exceptions （ except  exceptionsToIgnore  The types of exceptions excluded ） To deal with . If you configure fallback and defaultFallback, With fallback Subject to . Function requirements ： 1. The return type is the same as the original method 2. The method parameter list is empty , Or there's a  Throwable  Parameters of type . 3. By default, it needs to be in the same class as the original method . If you want to use functions of other classes , Configurable  fallbackClass , And designate  fallbackClass  The method inside .	no
exceptionsToIgnore【1.6】	Specify which exceptions to exclude . Excluded exceptions are not counted in the exception statistics , And will not enter fallback Logic , It's the same thing .	no
exceptionsToTrace	need trace It's abnormal	Throwable

> TIPS
>
> - 1.6.0 Previous version fallback Function is only for degraded exceptions （DegradeException） To deal with , Can't handle business exceptions .
> - if blockHandler and fallback It's all configured , It is degraded by current limiting and thrown  BlockException  It will only enter  blockHandler  Processing logic . If not configured  blockHandler、fallback  and  defaultFallback, When it is degraded by current limiting, it will  BlockException  Direct selling .
> - from 1.4.0 Version start , Annotation method definition resource supports automatic statistics of business exceptions , No manual call required  Tracer.trace(ex)  To record business exceptions .Sentinel 1.4.0 Previous versions needed to call themselves  Tracer.trace(ex)  To record business exceptions .