CODEWITHSUNDEEP
iphoneobjective-ciosipadnsoperationqueue
xonegirlz
xonegirlz

Reputation: 8977

checking if URL request is already in NSOperationQueue

I have a NSOperationQueue that takes in a bunch of operation download request. The question is how do I check if I have a specific URL already on the NSOperationQueue? Because if it's alreayd in the queue I don't want to enqueue it again.

Upvotes: 1

Views: 897

Answers (1)

omz
omz

Reputation: 53561

You could subclass NSOperation (if you haven't done so already), add a URL property to your subclass, and check whether an operation with the URL you're about to add is already in the queue:

if (![[queue.operations valueForKey:@"URL"] containsObject:myURL]) {
   //add operation...
} else {
   //operation with this URL is already in the queue...
}

If you have lots of operations going on, you might want to track the URLs separately in an NSMutableSet which is more efficient for membership testing. You'd then have to remove the URL from the set when an operation completes.

Upvotes: 3

Related Questions