与反应式 Flux 一起使用的 Resilience4j 断路器永远不会因错误而更改为 OPEN
Resilience4j circuit breaker used with reactive Flux never changes to OPEN on errors
我正在评估 resilience4j 以将其包含在我们的反应 APIs 中,到目前为止我正在使用模拟 Fluxes。
下面的服务总是失败,因为我想测试电路是否因多个错误而打开:
@Service
class GamesRepositoryImpl : GamesRepository {
override fun findAll(): Flux<Game> {
return if (Math.random() <= 1.0) {
Flux.error(RuntimeException("fail"))
} else {
Flux.just(
Game("The Secret of Monkey Island"),
Game("Loom"),
Game("Maniac Mansion"),
Game("Day of the Tentacle")).log()
}
}
}
这是使用存储库的处理程序,打印电路的状态:
@Component
class ApiHandlers(private val gamesRepository: GamesRepository) {
var circuitBreaker : CircuitBreaker = CircuitBreaker.ofDefaults("gamesCircuitBreaker")
fun getGames(serverRequest: ServerRequest) : Mono<ServerResponse> {
println("*********${circuitBreaker.state}")
return ok().body(gamesRepository.findAll().transform(CircuitBreakerOperator.of(circuitBreaker)), Game::class.java)
}
}
我多次调用 API 端点,总是得到这个堆栈跟踪:
*********CLOSED
2018-03-14 12:02:28.153 ERROR 1658 --- [ctor-http-nio-3] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET http://localhost:8081/api/v1/games]
java.lang.RuntimeException: FAIL
at com.codependent.reactivegames.repository.GamesRepositoryImpl.findAll(GamesRepositoryImpl.kt:12) ~[classes/:na]
at com.codependent.reactivegames.web.handler.ApiHandlers.getGames(ApiHandlers.kt:20) ~[classes/:na]
...
2018-03-14 12:05:48.973 DEBUG 1671 --- [ctor-http-nio-2] i.g.r.c.i.CircuitBreakerStateMachine : No Consumers: Event ERROR not published
2018-03-14 12:05:48.975 ERROR 1671 --- [ctor-http-nio-2] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET http://localhost:8081/api/v1/games]
java.lang.RuntimeException: fail
at com.codependent.reactivegames.repository.GamesRepositoryImpl.findAll(GamesRepositoryImpl.kt:12) ~[classes/:na]
at com.codependent.reactivegames.web.handler.ApiHandlers.getGames(ApiHandlers.kt:20) ~[classes/:na]
at com.codependent.reactivegames.web.route.ApiRoutes$apiRouter.invoke(ApiRoutes.kt:14) ~[classes/:na]
如您所见,电路始终处于关闭状态。我不知道它是否有任何作用,但请注意此消息 No Consumers: Event ERROR not published
.
为什么这不起作用?
问题是默认的 ringBufferSizeInClosedState
是 100 个请求,我从来没有发出过这么多的手动请求。
我为测试设置了自己的 CircuitBreakerConfig
,现在电路立即打开:
val circuitBreakerConfig : CircuitBreakerConfig = CircuitBreakerConfig.custom()
.failureRateThreshold(50f)
.waitDurationInOpenState(Duration.ofMillis(10000))
.ringBufferSizeInHalfOpenState(5)
.ringBufferSizeInClosedState(5)
.build()
var circuitBreaker: CircuitBreaker = CircuitBreaker.of("gamesCircuitBreaker", circuitBreakerConfig)
我正在评估 resilience4j 以将其包含在我们的反应 APIs 中,到目前为止我正在使用模拟 Fluxes。
下面的服务总是失败,因为我想测试电路是否因多个错误而打开:
@Service
class GamesRepositoryImpl : GamesRepository {
override fun findAll(): Flux<Game> {
return if (Math.random() <= 1.0) {
Flux.error(RuntimeException("fail"))
} else {
Flux.just(
Game("The Secret of Monkey Island"),
Game("Loom"),
Game("Maniac Mansion"),
Game("Day of the Tentacle")).log()
}
}
}
这是使用存储库的处理程序,打印电路的状态:
@Component
class ApiHandlers(private val gamesRepository: GamesRepository) {
var circuitBreaker : CircuitBreaker = CircuitBreaker.ofDefaults("gamesCircuitBreaker")
fun getGames(serverRequest: ServerRequest) : Mono<ServerResponse> {
println("*********${circuitBreaker.state}")
return ok().body(gamesRepository.findAll().transform(CircuitBreakerOperator.of(circuitBreaker)), Game::class.java)
}
}
我多次调用 API 端点,总是得到这个堆栈跟踪:
*********CLOSED
2018-03-14 12:02:28.153 ERROR 1658 --- [ctor-http-nio-3] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET http://localhost:8081/api/v1/games]
java.lang.RuntimeException: FAIL
at com.codependent.reactivegames.repository.GamesRepositoryImpl.findAll(GamesRepositoryImpl.kt:12) ~[classes/:na]
at com.codependent.reactivegames.web.handler.ApiHandlers.getGames(ApiHandlers.kt:20) ~[classes/:na]
...
2018-03-14 12:05:48.973 DEBUG 1671 --- [ctor-http-nio-2] i.g.r.c.i.CircuitBreakerStateMachine : No Consumers: Event ERROR not published
2018-03-14 12:05:48.975 ERROR 1671 --- [ctor-http-nio-2] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET http://localhost:8081/api/v1/games]
java.lang.RuntimeException: fail
at com.codependent.reactivegames.repository.GamesRepositoryImpl.findAll(GamesRepositoryImpl.kt:12) ~[classes/:na]
at com.codependent.reactivegames.web.handler.ApiHandlers.getGames(ApiHandlers.kt:20) ~[classes/:na]
at com.codependent.reactivegames.web.route.ApiRoutes$apiRouter.invoke(ApiRoutes.kt:14) ~[classes/:na]
如您所见,电路始终处于关闭状态。我不知道它是否有任何作用,但请注意此消息 No Consumers: Event ERROR not published
.
为什么这不起作用?
问题是默认的 ringBufferSizeInClosedState
是 100 个请求,我从来没有发出过这么多的手动请求。
我为测试设置了自己的 CircuitBreakerConfig
,现在电路立即打开:
val circuitBreakerConfig : CircuitBreakerConfig = CircuitBreakerConfig.custom()
.failureRateThreshold(50f)
.waitDurationInOpenState(Duration.ofMillis(10000))
.ringBufferSizeInHalfOpenState(5)
.ringBufferSizeInClosedState(5)
.build()
var circuitBreaker: CircuitBreaker = CircuitBreaker.of("gamesCircuitBreaker", circuitBreakerConfig)