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/*! Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
/**
* Icinga.Timer
*
* Timer events are triggered once a second. Runs all reegistered callback
* functions and is able to preserve a desired scope.
*/
(function(Icinga, $) {
'use strict';
Icinga.Timer = function (icinga) {
/**
* We keep a reference to the Icinga instance even if we don't need it
*/
this.icinga = icinga;
/**
* The Interval object
*/
this.ticker = null;
/**
* Fixed default interval is 250ms
*/
this.interval = 250;
/**
* Our registerd observers
*/
this.observers = [];
/**
* Counter
*/
this.stepCounter = 0;
this.start = (new Date()).getTime();
this.lastRuntime = [];
this.isRunning = false;
};
Icinga.Timer.prototype = {
/**
* The initialization function starts our ticker
*/
initialize: function () {
this.isRunning = true;
var _this = this;
var f = function () {
if (_this.isRunning) {
_this.tick();
setTimeout(f, _this.interval);
}
};
f();
},
/**
* We will trigger our tick function once a second. It will call each
* registered observer.
*/
tick: function () {
var icinga = this.icinga;
$.each(this.observers, function (idx, observer) {
if (observer.isDue()) {
observer.run();
} else {
// Not due
}
});
icinga = null;
},
/**
* Register a given callback function to be run within an optional scope.
*/
register: function (callback, scope, interval) {
var observer;
try {
if (typeof scope === 'undefined') {
observer = new Icinga.Timer.Interval(callback, interval);
} else {
observer = new Icinga.Timer.Interval(
callback.bind(scope),
interval
);
}
this.observers.push(observer);
} catch(err) {
this.icinga.logger.error(err);
}
return observer;
},
unregister: function (observer) {
var idx = $.inArray(observer, this.observers);
if (idx > -1) {
this.observers.splice(idx, 1);
}
return this;
},
/**
* Our destroy function will clean up everything. Unused right now.
*/
destroy: function () {
this.isRunning = false;
this.icinga = null;
$.each(this.observers, function (idx, observer) {
observer.destroy();
});
this.observers = [];
}
};
Icinga.Timer.Interval = function (callback, interval) {
if ('undefined' === typeof interval) {
throw 'Timer interval is required';
}
if (interval < 100) {
throw 'Timer interval cannot be less than 100ms, got ' + interval;
}
this.lastRun = (new Date()).getTime();
this.interval = interval;
this.scheduledNextRun = this.lastRun + interval;
this.callback = callback;
};
Icinga.Timer.Interval.prototype = {
isDue: function () {
return this.scheduledNextRun < (new Date()).getTime();
},
run: function () {
this.lastRun = (new Date()).getTime();
while (this.scheduledNextRun < this.lastRun) {
this.scheduledNextRun += this.interval;
}
this.callback();
},
destroy: function () {
this.callback = null;
}
};
}(Icinga, jQuery));
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