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https://issues.apache.org/jira/browse/CAMEL-5539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185200#comment-14185200
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Yves De Moor commented on CAMEL-5539:
-------------------------------------
Simple, quick and most flexible solution could be :
Put the number of failure in an exchange property.
Put circuit state in an exchange property (2 status : Open / closed, as
halfOpen do the same as closed in term of business)
use a Content Based Router to perform something like
from("direct:a")
.loadBalance()//
.circuitBreaker(3, 3000L, MyCustomException.class)
.choice()
.when(property(Exchange.CircuitBreaker_state).isEqualTo("closed"))
.to("direct:normalMode")
.when(property(Exchange.CircuitBreaker_state).isEqualTo("opened"))
.to("direct:degradedMode")
.end()
from("direct:degradedMode")
.choice()
.when(property(Exchange.CircuitBreaker_errorCount).isEqualTo("1")) //First
error encountered, send an alert to monitoring
.to("direct:monitorging_alert_degradedMode")
.end()
I also see the current solution is not enough robust.
when halfOpen is reached, (System.currentTimeMillis() - lastFailure <
halfOpenAfter) there is no restriction on the number of calls (threads) that
will perform a retry.
When retry timeout is reached, we should let only 1 thread go in "halfOpen"
mode, all other should be kept in "open" state until an halfOpen succeed.
(will create new issue for this)
Yves.
> Circuit Breaker EIP
> -------------------
>
> Key: CAMEL-5539
> URL: https://issues.apache.org/jira/browse/CAMEL-5539
> Project: Camel
> Issue Type: New Feature
> Components: camel-core, eip
> Reporter: Claus Ibsen
> Assignee: Raúl Kripalani
> Fix For: Future
>
> Attachments: CAMEL-5539-output-82ef800.txt, CAMEL-5539-output.txt
>
>
> Look at add the circuit breaker EIP to the Camel DSL.
> http://davybrion.com/blog/2008/05/the-circuit-breaker/
> Would need some thoughts for that though. Either as an explicit in the DSL.
> Or as a interceptor for sending to an endpoint. As explicit its a kind to the
> load balancer (in fact it may be extended upon that). Either the LB selects
> the intended target, or it select the breaker, which rejects executing the
> message.
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