> On Mar 1, 2014, at 07:23 , Trygve Inda <cocoa...@xericdesign.com> wrote: > >> The problem is that when there is a very small change (just adding or >> removing one of the files in the package), the system does not save in >> place. >> >> Rather it reads the previous package file completely, writes out a copy of >> the package (400 MB) and then renames it. >> >> How can I get it to save in place? > > AFAIK, NSDocument never saves in place, and isn’t intended to (for safety > reasons — what happens if your app crashes after some of the files have been > updated but not others?). > > Instead, it achieves its package performance optimization by hard-linking > unchanged files in the new (saved) package to files in the old (original) > package. If your save is taking 40 seconds, that could mean: > > — The document is on a file system that doesn’t support hard linking. > > — The document is on a file system where hard linking 7500 files takes 40 > seconds. > > — You didn’t preserve the original file sub-wrappers from the directory > wrapper created when the document was opened, so NSDocument thinks all the > files have changed. Note that it’s undocumented (again, AFAIK) what criteria > NSDocument uses** to decide when a particular file wrapper represents “no > change”, so it’s safest to keep the original NSFileWrapper objects from open > time until save time. > > > > ** The most likely possibilities are ‘==’ on file wrappers, ‘isEqual:’ on file > wrappers, or comparison of mod date and/or size of the actual files, but it > could be something more obscure. >
When a file is opened, my NSDocument subclass uses -(BOOL)readFromFileWrapper:(NSFileWrapper *)fileWrapper ofType:(NSString *)typeName error:(NSError **)outError After loading it, I call [self setDocumentFileWrapper:fileWrapper]; Which stores the fileWrapper in my Document object for later use. Later, when saving I use -(NSFileWrapper *)fileWrapperOfType:(NSString *)typeName error:(NSError **)outError Even if I only call return documentFileWrapper; So the document is saved with zero changes, it takes 40 seconds on my package with 7500 sub-items. It should happen almost instantly, but it doesn't. I am using a normal Mac HFS system. I really need this to be faster. Trygve _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
