TealiumQueue Class Reference

public class TealiumQueue

A wrapper class around DispatchQueue to only dispatch asynchronously when we are on a different queue.

Making it dispatch synchronously in a generic library would instead be not safe and could lead to deadlocks. An example of deadlock that would look safe is this:

 DispatchQueue.main.async {
     let queue = TealiumQueue(label: "something")
     queue.ensureOnQueue {
         print("This will print")
         DispatchQueue.main.sync { // This is something that a user might do on one of our completions
             print("This will never print")
         }
     }
     queue.syncOnQueue { // This is something that might be part of our library if we do introduce a method like this
         print("This will never print")
     }
 }

Therefore we only have, and only should have, an async method which is ensureOnQueue.