Actor (Swift 5.5+) vs GCD (DispatchQueue) Karşılaştırması

actor UserCache {
    private var cache: [String: User] = [:]

    func get(id: String) -> User? {
        return cache[id]
    }

    func set(id: String, user: User) {
        cache[id] = user
    }
}

// Usage
let cache = UserCache()
let user = await cache.get(id: "123")  // actor hop automatic

import Foundation

class UserCache {
    private let queue = DispatchQueue(label: "cache", attributes: .concurrent)
    private var cache: [String: User] = [:]

    func get(id: String, completion: @escaping (User?) -> Void) {
        queue.async {
            completion(self.cache[id])
        }
    }

    func set(id: String, user: User) {
        queue.async(flags: .barrier) {
            self.cache[id] = user
        }
    }
}