import Foundation

import Dispatch

/// `CallbackQueue` represents queue where `handler` of `Session.send(_:handler:)` runs.

public enum CallbackQueue {

/// Dispatches callback closure on main queue asynchronously.

case main

/// Dispatches callback closure on the queue where backend adapter callback runs.

case sessionQueue

/// Dispatches callback closure on associated operation queue.

case operationQueue(OperationQueue)

/// Dispatches callback closure on associated dispatch queue.

case dispatchQueue(DispatchQueue)

public func execute(closure: @escaping () -> Void) {

switch self {

case .main:

DispatchQueue.main.async {

closure()

}

case .sessionQueue:

closure()

case .operationQueue(let operationQueue):

operationQueue.addOperation {

closure()

}

case .dispatchQueue(let dispatchQueue):

dispatchQueue.async {

closure()

}

}

}

}