> On Aug 14, 2015, at 5:46 PM, Carl Hoefs <[email protected]>
> wrote:
>
>
>> On Aug 14, 2015, at 4:15 PM, Ken Thomases <[email protected]> wrote:
>>
>> You'll need to create a new operation each time you want to queue a
>> particular invocation.
>
> Yes, I'm doing that. The problem is finding a mechanism to re-queue a new
> operation from the current one after it is done, so the queue can be empty
> for a time.
Here's what I'm trying to do, but in code rather than words:
. . .
[self doStatusChecks]; // start endless checking at 1-min intervals
. . .
- (void)doStatusChecks
{
[jobQueue addOperation:[[NSInvocationOperation alloc] initWithTarget:self
selector:@selector(checkStatus) object:nil]];
}
- (void)checkStatus
{
// Access device & read status
// If bad, do work...
// Enqueue another operation, but after 60 sec delay
[self performSelector:@selector(doStatusChecks)
withObject:nil
afterDelay:60.0]; // <-- This never fires!
[self doStatusChecks]; // <-- Fires immediately, but not what I want
}
-Carl
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