我有一个使用Hystrix断路器模式的服务,它调用第三方服务。在的帮助下
@HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "1000")我已经为第三方服务定义了超时。
由于Hystrix处于维护模式,因此我将从Hystrix模式迁移到resilience4j断路器模式。如何在resiience4j中实现类似的超时处理。
我知道类似的事情可以通过使用@TimeLimiter来实现,它是resilience4j-timelimiter的一部分。但是根据这个问题:https://github.com/resilience4j/resilience4j/issues/849,我必须将我的方法的返回类型修改为CompletableFuture。它将涉及到我现有服务的大量代码更改。我如何使用resilience4j实现这一点?
发布于 2021-09-10 18:25:50
我不得不处理和你一样的问题。
对我来说,resilience4j的TimeLimiter解决了我的问题,不再需要使用Hystrix了。
这是我的application.properties:
resilience4j.timelimiter.configs.default.timeout-duration=3s
resilience4j.timelimiter.instances.paymentCalc.base-config=default
# The max amount of time a call can last
resilience4j.timelimiter.instances.paymentCalc.timeout-duration=1s
# Cancel the Running Completable Futures After TimeOut.
resilience4j.timelimiter.instances.paymentCalc.cancel-running-future=true
# Max amount of parallel executions allowed by the bulkhead
resilience4j.bulkhead.configs.default.max-concurrent-calls=2
# Max amount of time a thread should be blocked for when attempting to enter a saturated bulkhead.
resilience4j.bulkhead.configs.default.max-wait-duration=0
resilience4j.bulkhead.instances.paymentCalc.base-config=default这是我的实现:
// Bulkhead module is added because TimeLimiter needs separate execution thread instead of request thread
@Bulkhead(name = "paymentCalc", fallbackMethod = "localPaymentGenerate", type = Bulkhead.Type.THREADPOOL)
@TimeLimiter(name = "paymentCalc", fallbackMethod = "localPaymentGenerate")
@GetMapping(value = "/{workerId}/days/{days}")
public CompletableFuture<ResponseEntity<Payment>> getPayment(@PathVariable Long workerId, @PathVariable Integer days){
...
}
public CompletableFuture<ResponseEntity<Payment>> localPaymentGenerate(Long workerId, Integer days, Exception e){
System.out.println(e.getMessage()); // prints "TimeLimiter 'paymentCalc' recorded a timeout exception"
...
}但是,要小心,代码不能使用spring-cloud-starter-circuitbreaker-resilience4j依赖来工作,我花了很多时间试图解决这个问题。要让@TimeLimiter get正常工作,我需要做的唯一一件事就是更改依赖项。
我使用的是spring-boot <version>2.5.4</version>,<java.version>16</java.version>和我的依赖项是:
<dependency>
<groupId>io.github.resilience4j</groupId>
<artifactId>resilience4j-spring-boot2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>https://stackoverflow.com/questions/61276120
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