NSURLDownload mysteriously pausing
Sidney San Martín
I ran into an issue recently where file downloads seemed to take a ridiculous amount of time to finish, or never finished at all. I could reproduce it, even in a stripped-down test application.
The NSURLDownload appears to pause indefinitely whenever there is no other activity in the application. Any activity at all — a key press while the application is in front, moving a window around, etc. — makes it continue for a short amount of time (which can be observed in the log or in Activity Monitor's network activity graph).
Below is the main class of a test application with a main class called downloaderAppDelegate. The issue's reproducible for me by dropping it into a new Xcode Cocoa application project.
What the heck is going on?
-Sidney
@implementation downloaderAppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
[[NSURLDownload alloc] initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"ftp://ftp1.optonline.net/test64"]] delegate:self];
}
#pragma mark NSURLDownload delegate methods
- (void)download:(NSURLDownload *)download didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"Response: %@", response);
}
- (void)download:(NSURLDownload *)d didReceiveDataOfLength:(NSUInteger)length
{
NSLog(@"received %d", length);
}
- (void)download:(NSURLDownload *)d decideDestinationWithSuggestedFilename:(NSString *)name
{
[d setDestination:[NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/testDownload"] allowOverwrite:NO];
}
- (void)downloadDidFinish:(NSURLDownload *)d
{
NSLog(@"Download complete");
exit(0);
}
- (void)download:(NSURLDownload *)d didFailWithError:(NSError *)error
{
NSLog(@"Failed to download (%@)", [error localizedDescription]);
exit(0);
}
@end
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Michael Babin
> Greetings!
> I ran into an issue recently where file downloads seemed to take a ridiculous amount of time to finish, or never finished at all. I could reproduce it, even in a stripped-down test application.
>
> The NSURLDownload appears to pause indefinitely whenever there is no other activity in the application. Any activity at all — a key press while the application is in front, moving a window around, etc. — makes it continue for a short amount of time (which can be observed in the log or in Activity Monitor's network activity graph).
>
> Below is the main class of a test application with a main class called downloaderAppDelegate. The issue's reproducible for me by dropping it into a new Xcode Cocoa application project.
>
> What the heck is going on?
To quote from:
"For the download to work correctly the calling thread’s run loop must be operating in the default run loop mode."
Doing anything out of the ordinary with the run loop?
- Mike
Sidney San Martín
> On Feb 16, 2011, at 1:00 PM, Sidney San Martín wrote:
>
> > Greetings!
> > I ran into an issue recently where file downloads seemed to take a
> ridiculous amount of time to finish, or never finished at all. I could
> reproduce it, even in a stripped-down test application.
> >
> > The NSURLDownload appears to pause indefinitely whenever there is no
> other activity in the application. Any activity at all — a key press while
> the application is in front, moving a window around, etc. — makes it
> continue for a short amount of time (which can be observed in the log or in
> Activity Monitor's network activity graph).
> >
> > Below is the main class of a test application with a main class called
> downloaderAppDelegate. The issue's reproducible for me by dropping it into a
> new Xcode Cocoa application project.
> >
> > What the heck is going on?
>
> To quote from:
>
> <
> http://developer.apple.com/library/mac/#documentation/cocoa/reference/Foundation/Classes/NSURLDownload_Class/Reference/Reference.html
> >
>
> "For the download to work correctly the calling thread’s run loop must be
> operating in the default run loop mode."
>
> Doing anything out of the ordinary with the run loop?
>
> - Mike
>
Hey, Mike.
That's a good point, but the above code reproduces the issue for me on a
vanilla Cocoa project — no runloop weirdness.
Joar Wingfors
On 16 feb 2011, at 11.00, Sidney San Martín wrote:
> Below is the main class of a test application with a main class called downloaderAppDelegate. The issue's reproducible for me by dropping it into a new Xcode Cocoa application project.
I've not been able to reproduce that issue (with the provided URL, or any other URL). I tried it on Mac OS X 10.6.6.
j o a r