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/** @license MIT License (c) copyright B Cavalier & J Hann */
/**
* cancelable.js
* @deprecated
*
* Decorator that makes a deferred "cancelable". It adds a cancel() method that
* will call a special cancel handler function and then reject the deferred. The
* cancel handler can be used to do resource cleanup, or anything else that should
* be done before any other rejection handlers are executed.
*
* Usage:
*
* var cancelableDeferred = cancelable(when.defer(), myCancelHandler);
*
* @author brian@hovercraftstudios.com
*/
(function(define) {
define(function() {
/**
* Makes deferred cancelable, adding a cancel() method.
* @deprecated
*
* @param deferred {Deferred} the {@link Deferred} to make cancelable
* @param canceler {Function} cancel handler function to execute when this deferred
* is canceled. This is guaranteed to run before all other rejection handlers.
* The canceler will NOT be executed if the deferred is rejected in the standard
* way, i.e. deferred.reject(). It ONLY executes if the deferred is canceled,
* i.e. deferred.cancel()
*
* @returns deferred, with an added cancel() method.
*/
return function(deferred, canceler) {
// Add a cancel method to the deferred to reject the delegate
// with the special canceled indicator.
deferred.cancel = function() {
try {
deferred.reject(canceler(deferred));
} catch(e) {
deferred.reject(e);
}
return deferred.promise;
};
return deferred;
};
});
})(typeof define === 'function' && define.amd ? define : function (factory) { module.exports = factory(); });
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