com.gilt.gfc.util

Retry

object Retry

Helper to retry potentially failing functions

Since

10/Apr/2015 16:55

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  17. def retry[T](maxRetryTimes: Long = Long.MaxValue)(f: ⇒ T)(implicit log: (Throwable) ⇒ Unit = _.printStackTrace): T

    Retries a function until it succeeds or a maximum number of retries has been reached.

    Retries a function until it succeeds or a maximum number of retries has been reached.

    maxRetryTimes

    The maximum number of retries, defaults to Long.MaxValue. The function f is called at most maxRetryTimes + 1 times. In other words, iff maxRetryTimes == 0, f will be called exactly once, iff maxRetryTimes == 1, it will be called at most twice, etc.

    f

    The function to (re)try

    log

    An optional log function to report failed iterations to. By default prints the thrown Exception to the console.

    returns

    A successful T if the function succeeded within maxRetryTimes or the last thrown NonFatal Exception otherwise. If the function throws a fatal Error, it is not retried and the error is rethrown.

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  18. def retryWithExponentialDelay[T](maxRetryTimes: Long = Long.MaxValue, maxRetryTimeout: Deadline = 1 day fromNow, initialDelay: Duration = 1 millisecond, maxDelay: FiniteDuration = 1 day, exponentFactor: Double = 2)(f: ⇒ T)(implicit log: (Throwable) ⇒ Unit = _.printStackTrace): T

    Retries a function until it succeeds, a maximum number of retries has been reached, or a retry timeout has been reached.

    Retries a function until it succeeds, a maximum number of retries has been reached, or a retry timeout has been reached. Each retry iteration is being exponentially delayed. The delay grows from a given start value and by a given factor until it reaches a given maximum delay value. If maxRetryTimeout is reached, the last function call is at the point of the timeout. E.g. if the initial delay is 1 second, the retry timeout 10 seconds and all other parameters at their default, the function will be retried after 1, 3 (1+2), 7 (1+2+4) and finally 10 seconds before it fails.

    maxRetryTimes

    The maximum number of retries, defaults to Long.MaxValue. The function f is called at most maxRetryTimes + 1 times. In other words, iff maxRetryTimes == 0, f will be called exactly once, iff maxRetryTimes == 1, it will be called at most twice, etc.

    maxRetryTimeout

    The retry Deadline until which to retry the function, defaults to 1 day from now

    initialDelay

    The initial delay value, defaults to 1 nanosecond

    maxDelay

    The maximum delay value, defaults to 1 day

    exponentFactor

    The factor by which the delay increases between retry iterations

    f

    The function to (re)try

    log

    An optional log function to report failed iterations to. By default prints the thrown Exception to the console.

    returns

    A successful T if the function succeeded within maxRetryTimes and maxRetryTimeout or the last thrown NonFatal Exception otherwise. If the function throws a fatal Error, it is not retried and the error is rethrown.

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