What's the correct way to modify the Duration Break on Polly? I know in the documentation they mention implementing (PolicyRegistry). Is there any example of this? I was implementing Polly CircuitBreaker in one WinService.
Polly CircuitBreaker - Dynamic Duration of Break
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Circuit Breaker was not designed to use different sleep duration whenever it breaks.
In case of Retry you have the ability to provide a function, called
sleepDurationProvider
which is called by the policy to determine the actual sleep duration before issuing the next attempt.So, in short by design it is not supported. I will show you a workaround, but I do not recommend to use it. I will provide a reasoning after the sample code.
For the sake of simplicity let's have the following method:
Let's define a helper method which increases the time period (>> sleep duration) each and every time whenever it is called:
sleepDurationProvider
.Now it's time to define our Circuit Breaker policy:
GetSleepDuration
Probe
call the CB will breakdurationOfBreak
to zero because we will wait inside theonBreak
<< the workaroundIn order to ease our testing let's define a retry policy:
Probe
's exceptionLet's wire up the policies and run the test:
The output will be:
Probe
has been called and failedOpen
toBroken
onBreak
has been called, which block the execution for 1 secondPolicyWrap
escalates the problem to RetryBroken
toHal-Open
Probe
has been called and failedThe biggest problem with this solution that it is blocking. Unfortunately there is no async version of
onBreak
. (Retry does haveonRetryAsync
, in which you could useTask.Delay
instead ofThread.Sleep
)The second problem is that it relies on the current implementation. This solution won't work if for example the
onBreak
is executed on a different thread and the exception is thrown immediately.