I am in need of a PeriodicalExecuter that I would start and stop
regularly and quite a lot. The doc tells me that I should create a new
one each time, but it doesn't looks like good memory management
practice to me.
So here is a proposition for an upgrade to PeriodicalExecuter (note
that I am only really interested in the 'start' method, the rest is
just there for completion).
Pascal (aka pvk in the comments)
var PeriodicalExecuter = Class.create({
initialize: function(callback, frequency) {
this.callback = callback;
this.frequency = frequency;
this.currentlyExecuting = false;
// Modif PVK : public flag that could be query to check if a
timer had been paused
this.active = false;
this.registerCallback();
},
registerCallback: function() {
this.timer = setInterval(this.onTimerEvent.bind(this),
this.frequency * 1000);
// Modif PVK : public flag that could be query to check if a
timer had been paused
this.active = true;
},
execute: function() {
this.callback(this);
},
stop: function() {
if (!this.timer) return;
clearInterval(this.timer);
this.timer = null;
// Modif PVK
this.active = false;
},
// Addition PVK : just make sure that the timer is active, in case we
stop it earlier
start: function() {
if (this.timer) return;
this.registerCallback();
},
// Addition PVK : force a restart : not sure it this is meaningfull
for public use, but there for
// the following additions
restart: function() {
this.stop();
this.registerCallback();
},
// Addition PVK
changeFrequency: function(frequency) {
this.frequency = frequency;
this.restart();
},
// Addition PVK
changeCallback: function(callback) {
this.callback = callback;
this.restart();
},
onTimerEvent: function() {
if (!this.currentlyExecuting) {
try {
this.currentlyExecuting = true;
this.execute();
} finally {
this.currentlyExecuting = false;
}
}
}
});
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