IdentifiableLock

Identifiable mutex lock which does thread locking of Hashable instances per their identifiers Allows only one identifier to be changed at the same time

• Per identifier locking is implented using a Dictionary of objects with hasValue string as key and DispatchSemaphore as value
• When performChanges: is called with given object a semaphore.wait() is called synchronously until ongoing changes to identifier in question are finished