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public class Pool<Element> | |
{ | |
/// Los elementos que gestionamos | |
public private(set) var elements: [Element] | |
/// La queue de tipo serial | |
private let queue: DispatchQueue | |
/// El semáforo de control de acceso | |
private let semaphore: DispatchSemaphore | |
/// Elementos disponibles en un momento dado | |
public var elementsAvailables: Int | |
{ | |
var count = 0 | |
self.queue.sync | |
{ | |
count = self.elements.count | |
} | |
return count | |
} | |
/** | |
Nuevo Pool | |
*/ | |
public init(elements: [Element]) | |
{ | |
self.elements = elements | |
self.queue = DispatchQueue(label: "com.desappstre.Pool./serial_queue") | |
self.semaphore = DispatchSemaphore(value: elements.count) | |
} | |
/** | |
Recupera un elemento | |
*/ | |
public func getElement() -> Element? | |
{ | |
// Esperamos a que haya un elemento disponible | |
// y decrementamos el contador del semáforo | |
self.semaphore.wait() | |
var the_element: Element? | |
self.queue.sync | |
{ | |
the_element = self.elements.removeFirst() | |
} | |
return the_element | |
} | |
/** | |
*/ | |
public func restore(_ element: Element) -> Void | |
{ | |
self.queue.async | |
{ | |
self.elements.append(element) | |
// Aumentamos el contador del semáforo | |
self.semaphore.signal() | |
} | |
} | |
} |
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