Re: FileWrapper & iCloud
Re: FileWrapper & iCloud
- Subject: Re: FileWrapper & iCloud
- From: Mike Abdullah <email@hidden>
- Date: Sat, 01 Dec 2012 16:42:59 +0000
On 30 Nov 2012, at 23:05, Dave Fernandes <email@hidden> wrote:
>
> On 2012-11-30, at 4:46 PM, Mike Abdullah <email@hidden> wrote:
>
>>
>> On 30 Nov 2012, at 18:59, Dave Fernandes <email@hidden> wrote:
>>
>>>
>>> On 2012-11-30, at 6:42 AM, Mike Abdullah <email@hidden> wrote:
>>>
>>>> One way to look at it is that NSPersistentDocument pretty much painted itself into a corner from day 1, and it's too messy for Apple to untangle that.
>>>
>>> Can you elaborate?
>>
>> Well it makes the assumptions that your document:
>>
>> - is comprised of a single Core Data store
>> - has a single managed object context
>
> This definitely limits your options. But, is it necessary to support file wrappers and iCloud? (Just trying to educate myself about how documents work.)
I don't understand your question here. Are you asking if my list of assumptions are necessary conditions for iCloud and file wrapper support?
>
>> - works entirely on the main thread
> This one is already opt-in for both opening and saving, so fragility shouldn't be an issue to upgrading the class.
>
> [Aside: As far as I know you *can* actually open an NSPersistentDocument asynchronously. At least I haven't seen anything that says you can't, and it seems to work on every system I've tried it on.]
Well you would appear to be breaking Core Data's threading contract by doing so. In theory, MOCs know the thread they were created on. So by creating the document on a background thread, you are also creating the MOC on that thread and giving it the wrong idea about the thread it will be used on.
On 10.7+ you can of course tell the context at creation time it's for the main thread, but I'd be a little surprised if NSPersistentDocument is doing that.
I also covered the topic fairly recently: http://www.mikeabdullah.net/concurrently-open-core-data-docs.html
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