polly retry

// polly retry
pollyRetry_ExecuteAndCapture(
        work, retryCount, delayer,
        handlesException, handlesResult):
    pollyResult = new
    for i = 0, i <= retryCount, i++:
        // default if success or ends in exception
        pollyResult.finalHandledResult  = default
        pollyResult.finalException      = default
        pollyResult.faultType           = default
        pollyResult.exceptionType       = default
        if i > 0:
            delay(delayer(i))
        try:
            result = work()
            if handlesResult(result):
                pollyResult.outcome = outcome.failure
                pollyResult.faultType = faultType.handledResult
                pollyResult.finalHandledResult = result
                // retry
                continue
            else:
                pollyResult.outcome = outcome.successful
                pollyResult.result = result
                break
        catch ex:
            pollyResult.finalException = ex
            if handlesException(ex):
                pollyResult.outcome = outcome.failure
                pollyResult.faultType = faultType.handledException
                pollyResult.exceptionType = exceptionType.handled
                // swallow, retry
                continue
            else:
                // do not throw
                pollyResult.outcome = outcome.failure
                pollyResult.faultType = faultType.unhandledException
                pollyResult.exceptionType = exceptionType.unhandled
                break
    return pollyResult

// polly retry
pollyRetry_Execute(
        work, retryCount, delayer,
        handlesException, handlesResult):
    pollyResult = pollyRetry_ExecuteAndCapture(work, retryCount, delayer,
        handlesException, handlesResult)
    if pollyResult.finalException != null:
        throw pollyResult.finalException
    return pollyResult.result