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define('util/promise', [
'jquery',
'underscore',
'exports'
], function(
$,
_,
exports) {
'use strict';
function maybeAbort(abortable) {
abortable && abortable.abort && abortable.abort();
}
function reduce(/*...promises*/) {
var promises = Array.prototype.slice.call(arguments);
var promise = $.when.apply($, promises);
promise.abort = function() {
_.forEach(promises, maybeAbort);
};
return promise;
}
function noAbort() {
console.log("Promise does not have an abort function");
}
/**
* Return an abortable promise that combines multiple sub promises.
* When abort is called ont he output promise, all the input promises are aborted (if they support abort).
*
* @returns {{then: Function, abort: Function, thenAbortable: Function}}
*/
function whenAbortable(/*...promises*/){
var combinedPromise = $.when.apply($, arguments);
combinedPromise.abort = _.invoke.bind(_, arguments, 'abort');
return thenAbortable(combinedPromise);
}
/**
* Add `abort` to a promise chain that _tries_ to abort (advisory only). If either the initial promise or the promise returned from the `then` callbacks
* has an `abort` method, it will be called. If not, abort will do it's best: the callbacks won't be called if `abort()`
* was called while the initial promise is executing, and the result will parrot back the result of the initial promise.
*
* @param {Promise} promise
* @param {Function} [successCallback]
* @param {Function} [failureCallback]
* @returns {{ then: Function, abort: Function, thenAbortable: Function }}
*/
function thenAbortable(promise, successCallback, failureCallback) {
var aborted;
var abortable = promise;
var onAbort = $.Callbacks();
var out = {};
function doAbort() {
if (out.state() === 'pending') {
// don't call abort if we're already resolved/rejected
if (!aborted) {
// don't call abort more than once
maybeAbort(abortable);
}
aborted = true;
}
// always fire the onAbort event
// This lets us abort a thenAbortable chain from the root:
// var deferred = $.Deferred().resolve();
// var root = thenAbortable(deferred);
// var tertiary = root.thenAbortable(something).thenAbortable(other);
// root.state() === 'resolved'
// tertiary.state() === 'pending'
// root.abort(); // should still try to abort tertiary, even though root is resolved.
onAbort.fire();
}
function abortableCallback(resolveOrReject, callback) {
return function() {
if (aborted) {
return new $.Deferred()[resolveOrReject + 'With'](this, arguments);
}
abortable = callback.apply(this, arguments);
return abortable;
};
}
var outPromise = promise.then(
successCallback ? abortableCallback('resolve', successCallback) : null,
failureCallback ? abortableCallback('reject', failureCallback) : null);
out.abort = doAbort;
out.thenAbortable = function(successCallback, failureCallback) {
var newAbortable = thenAbortable(out, successCallback, failureCallback);
onAbort.add(newAbortable.abort);
return newAbortable;
};
return outPromise.promise(out);
}
/**
* Returns a function that will return a delayed promise that is `abort`able and `reset`able. This allows you to
* implement things like debounced promise resolution.
*
* Calling abort during the delay will avoid having the internal promise created at all.
* Calling reset will reset the delay to `interval` and wait longer before creating the internal promise.
*
* @param {Function} promiseFactory - a function that will return a promise when called.
* @param {number} interval - how long to delay the promise
* @returns {Function}
*/
function delay(promiseFactory, interval) {
return function() {
var defer = $.Deferred();
var self = this;
var args = Array.prototype.slice.call(arguments);
var abort;
var createTimeout = function() {
return setTimeout(function() {
var originalPromise = promiseFactory.apply(self, args);
// Don't use .then() because it returns a new promise without xhr's abort function
originalPromise.done(defer.resolve)
.fail(defer.reject);
abort = originalPromise.abort ? _.bind(originalPromise.abort, originalPromise) : noAbort;
}, interval);
};
var timeout = createTimeout();
abort = function() {
clearTimeout(timeout);
defer.reject(defer, 'abort', 'abort');
};
return defer.promise({
abort: function() {
abort();
},
/**
* Resets the timeout so that the promise will be delayed by another `interval`. Also resets the
* arguments the promiseFactory will be called with, by the arguments passed to this function.
* Calling this does nothing if the timeout has already expired, or if the promise has been aborted.
* By calling this repeatedly you can simulate a promise that is "debounced" by `interval`.
*/
reset: function() {
if (defer.state() === 'pending') {
clearTimeout(timeout);
args = Array.prototype.slice.call(arguments);
timeout = createTimeout();
}
}
});
};
}
/**
* Works like $.when, but waits for all promises to finish, regardless of any resolutions or rejects.
* The resulting promise will use the `this` param of the first rejected promise, or the first promise if none are rejected.
*
* @param {...Promise} promises - promises to be combined into a single promise
* @returns {Promise}
*/
function settle(/*...promises*/) {
return $.when.apply($, _.map(arguments, _alwaysResolve))
.then(_extractOriginalPromises, _extractOriginalPromises);
}
/**
* @private
*/
function _alwaysResolve(promise) {
return promise.then(_saveCallParams(false), _saveCallParams(true));
}
/**
* Paired with _extractOriginalPromises. Returns a promise that represents the result of the original promise
*
* @param {boolean} isRejected
* @returns {Function}
* @private
*/
function _saveCallParams(isRejected) {
return function() {
return $.Deferred().resolve({
rejectedSelf : isRejected && this,
self : this,
args : Array.prototype.slice.call(arguments)
});
};
}
/**
* Paired with _saveCallParams. Extracts the promise results from a list of promises.
* Uses the `this` from the first rejected promise, or the first promise if no promise is rejected.
* Returns a Promise that represents all results.
*
* @returns {Promise}
* @private
*/
function _extractOriginalPromises(/*...promises*/) {
var rejectedSelf = _.chain(arguments).pluck('rejectedSelf').find(_.identity).value();
var resolution = (rejectedSelf ? 'reject' : 'resolve') + 'With';
var self = rejectedSelf || arguments[0].self;
var args = _.pluck(arguments, 'args');
return $.Deferred()[resolution](self, args);
}
/**
* Display a spinner while the promise is pending.
*
* @param {string|HTMLElement|jQuery} selector - where to place the spinner
* @param {Promise} promise - spin while this is pending
* @param {string} size - size of the spinner
* @returns {Promise}
*/
function spinner(selector, promise, size) {
var $spinner = $(selector).spin(size || 'small');
return promise.always(function() {
$spinner.remove();
});
}
exports.delay = delay;
exports.reduce = reduce;
exports.settle = settle;
exports.spinner = spinner;
exports.thenAbortable = thenAbortable;
exports.whenAbortable = whenAbortable;
});
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