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/**
* Copyright (c) 2015, Arthur Schiwon <blizzz@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or later.
* See the COPYING-README file.
*/
OCA = OCA || {};
(function() {
/**
* @classdesc only run detector is allowed to run at a time. Basically
* because we cannot have parallel LDAP connections per session. This
* queue is takes care of running all the detectors one after the other.
*
* @constructor
*/
var WizardDetectorQueue = OCA.LDAP.Wizard.WizardObject.subClass({
/**
* initializes the instance. Always call it after creating the instance.
*/
init: function() {
this.queue = [];
this.isRunning = false;
},
/**
* empties the queue and cancels a possibly running request
*/
reset: function() {
this.queue = [];
if(!_.isUndefined(this.runningRequest)) {
this.runningRequest.abort();
delete this.runningRequest;
}
this.isRunning = false;
},
/**
* a parameter-free callback that eventually executes the run method of
* the detector.
*
* @callback detectorCallBack
* @see OCA.LDAP.Wizard.ConfigModel._processSetResult
*/
/**
* adds a detector to the queue and attempts to trigger to run the
* next job, because it might be the first.
*
* @param {detectorCallBack} callback
*/
add: function(callback) {
this.queue.push(callback);
this.next();
},
/**
* Executes the next detector if none is running. This method is also
* automatically invoked after a detector finished.
*/
next: function() {
if(this.isRunning === true || this.queue.length === 0) {
return;
}
this.isRunning = true;
var callback = this.queue.shift();
var request = callback();
// we receive either false or a jqXHR object
// false in case the detector decided against executing
if(request === false) {
this.isRunning = false;
this.next();
return;
}
this.runningRequest = request;
var detectorQueue = this;
$.when(request).then(function() {
detectorQueue.isRunning = false;
detectorQueue.next();
});
}
});
OCA.LDAP.Wizard.WizardDetectorQueue = WizardDetectorQueue;
})();