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From Alan Conway <acon...@redhat.com>
Subject Re: C++ messaging client: fractional values for reconnect parameters?
Date Fri, 03 Feb 2012 16:28:29 GMT
On 02/01/2012 11:21 AM, Andrew Stitcher wrote:
> On Wed, 2012-02-01 at 10:21 -0500, Alan Conway wrote:
>> Presently the C++ client takes options for reconnecting (reconnect-timeout,
>> reconnect-interval-min/max etc.) in seconds. A second is too long for
>> applications that require rapid fail-over. I'd like to make these values more
>> fine grained, but I don't want to break the existing interface.
>> Proposal: Have C++ treat reconnect time values as floats, so e.g.
>> reconnect-interval-min=0.001 sets a millisecond as the minimum interval.
>> Existing code will be unaffected. I believe this is already the case for the
>> python client, since python normally expresses time in floating-point seconds.
>> Does anyone see a problem with this approach or have an alternative suggestion?
>> The only alternatives I can think of are:
>> - break backward compatibility and re-interpret reconnect values as milliseconds
>> or nanoseconds rather than seconds.
>> - add another set of reconnect-timeout-ms or reconnect-timeout-ns options on top
>> of the existing second options.
> How about interpreting the value as a string and allowing suffixes to
> modify the time value:
> so
> --reconnect-timeout 1 == 1s [existing]
> --reconnect-timeout 1s == the same as above but explicit
> --reconnect-timeout 20ms == new mode less than a second
> --reconnect-timeout 100us == 100 microsecs
> --reconnect-timeout 1000ns == 1 microsecond (probably uselessly short)

I feel like the float approach is simpler. There's already a convenient and 
_standard_ notation for expressing small values e.g. 1e-6 is a microsecond, 
100e-6 is 100 microseconds, 1e-9 is a nanosecond etc. No need to introduce a 
parser for a new notation.

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