Locks.swift

class Locks {
	private var queuedDocuments = [String:Document]()
	private var inFlightDocuments = [String:Document]()

	private let queuedQueue = dispatch_queue_create("com.lucidchart.DocumentStateStoreLocks.queued", DISPATCH_QUEUE_SERIAL)
	private let inFlightQueue = dispatch_queue_create("com.lucidchart.DocumentStateStoreLocks.inFlight", DISPATCH_QUEUE_SERIAL)

	func queued(block: [String:Document] -> [String:Document]) {
		dispatch_sync(queuedQueue) {
			self.queuedDocuments = block(self.queuedDocuments)
		}
	}

	func inFlight(block: [String:Document] -> [String:Document]) {
		dispatch_sync(inFlightQueue) {
			self.inFlightDocuments = block(self.inFlightDocuments)
		}
	}
}