Resource management

Benjamin Gruenbaum benjamingr at gmail.com
Tue Jan 10 07:32:03 UTC 2017


Promise.using solves all that - give it a spin :)

On Tue, Jan 10, 2017 at 2:23 AM, Isiah Meadows <isiahmeadows at gmail.com>
wrote:

> I'll note that the disposer pattern is a lot like Ruby's resource
> management idioms as well (probably closer). The biggest issue I've seen
> with it so far is only how hard it is to compose while still avoiding
> leaks. Using one resource like that is easy, but joining multiple resources
> to use them simultaneously is much harder, and really requires some sort of
> abstraction. Promises complicate that further in that you have to
> effectively save an async continuation for each resource just to call back
> into them when done. Another complication is that some may end up
> unsuccessful, so you have to continue those that do succeed.
>
> As for any decent resource management, the current idioms suck, but I'm
> not sure what would be better.
>
> On Fri, Jan 6, 2017, 04:38 Benjamin Gruenbaum <benjamingr at gmail.com>
> wrote:
>
>> Oh, Bluebird's `Promise.using` does that with very high certainly. The
>> reason we introduced `using` rather than let people just use the disposer
>> pattern is because it is very tricky to get right in userland - so the
>> library provided it.
>>
>> On Fri, Jan 6, 2017 at 2:51 AM, Isiah Meadows <isiahmeadows at gmail.com>
>> wrote:
>>
>> It'd be nice to have something like that reified into the language
>> somehow. I'll note that Bluebird's gotcha with `Promise.using`
>> multiple resources simultaneously is a huge issue, though, and it
>> should be avoided for anything standardized. (If one of them fail, the
>> rest should be closed either immediately or as soon as they are
>> available, to avoid resource leaks.)
>> -----
>>
>> Isiah Meadows
>> me at isiahmeadows.com
>>
>>
>> On Mon, Jan 2, 2017 at 10:04 AM, Benjamin Gruenbaum
>> <benjamingr at gmail.com> wrote:
>> > And, on a similar note - a pattern has emerged in userland libraries all
>> > over:
>> > http://stackoverflow.com/questions/28915677/what-is-
>> the-promise-disposer-pattern
>> >
>> > _______________________________________________
>> > es-discuss mailing list
>> > es-discuss at mozilla.org
>> > https://mail.mozilla.org/listinfo/es-discuss
>> >
>>
>>
>>
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