On Oct 21, 2013, at 7:57 PM, Maxthon Chan <[email protected]> wrote:
> What about the “database” object? Is that yours? If so, can you
> retain/autorelease it (using runtime functions documented by LLVM) when
> purging?
Let me copy and paste what I said before: "I’m not in control of the cache
purge — it seems to be triggered as part of the app going into the background."
If you want to see the backtrace, it’s here (I tried to link to it before but
the listserv stripped the HTML link):
https://github.com/couchbase/couchbase-lite-ios/issues/164
The purge happens like so:
frame #25: 0x39445730 libcache.dylib`cache_remove_with_block + 132
frame #26: 0x2e7e6834
CoreFoundation`__CFNotificationCenterAddObserver_block_invoke + 124
frame #27: 0x2e870120
CoreFoundation`__CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
frame #28: 0x2e7e4316 CoreFoundation`_CFXNotificationPost + 1718
frame #29: 0x2f1c8dcc Foundation`-[NSNotificationCenter
postNotificationName:object:userInfo:] + 76
frame #30: 0x310a3040 UIKit`-[UIApplication
_handleApplicationSuspend:eventInfo:] + 908
…
That is, it looks like NSCache has registered itself for the
going-into-the-background notification. I have no control over this. There is
no way I can call anything before/after the purge. I cannot retain anything
while purging.
—Jens
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