On 4/2/13 9:44 AM, Romeo Kenfack Tsakem wrote:
Hi Werner,you are right, passing back a unique key when subscribing could be an enhancement. Please open a bug and we will have a look into it. Regards, Romeo -----Ursprüngliche Nachricht----- Von: Werner Thie [mailto:[email protected]] Gesendet: Sonntag, 31. März 2013 19:42 An: qooxdoo Development Betreff: [qooxdoo-devel] Managing subscriptions to q.e.message.Bus Hi all what's the envisioned pattern for managing subscriptions, where a lot of participating objects distributed among a hierarchy do subscribe/unsubscribe a lot to the bus (say for a simple status change) var bus = qx.event.message.Bus.getInstance(); bus.subscribe("statuschange", function(e) { //do some status changing } }, this); : : bus.unsubscribe(???); With this elegant registration I completely lose the possibility to unsubscribe, the function has be to be defined locally in some embracing function, such that I can pass the proper params to unsubscribe, namely (message, subscriber, context), with subscriber being the function. var bus = qx.event.message.Bus.getInstance(); function status(e) { //do some status changing } bus.subscribe("statuschange", status, this); : : bus.unsubscribe("statuschange", status, this); Now, what's the reason for not passing back a unique key when subscribing, which could be used as a weak link to the subscription and thus passed to unsubscribe to allow for a coding style like var bus = qx.event.message.Bus.getInstance(); var sub = bus.subscribe("statuschange", function(e) { //do some status changing } }, this); : : bus.unsubscribe(sub); Thxs for enlightening me, I might be groping for something obvious, which I simply do not see. Werner
Hi I'm currently using the attached solution Thxs, Werner
idbus.js
Description: JavaScript source
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