Created
December 17, 2014 06:56
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Observable and event emitters and event handlers practice
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| Observable = { | |
| observers : { | |
| start_observers : [], | |
| processing_observers : [], | |
| end_observers : [] | |
| }, | |
| messages : [], | |
| events : [], | |
| notifyObservers : function(event, message) { | |
| this.observers[event+'_observers'][0](message); | |
| }, | |
| doCrazyoperation : function() { | |
| this.notifyObservers('start', 'we are going to start'); | |
| for (var i = 0; i < 9999999999; i++) { | |
| if (i == 999999999) { | |
| this.notifyObservers('processing', 'we are at' + i); | |
| } | |
| } | |
| this.notifyObservers('end', 'operation ended'); | |
| }, | |
| on : function(event, observer) { | |
| this.events.push(event); | |
| this.observers[event+'_observers'].push(observer); | |
| } | |
| } | |
| ObserverOne = { | |
| callback : function(message) { | |
| if (message != undefined) | |
| console.log("Ob1" + message); | |
| } | |
| } | |
| Observable.on('start', function(message) { | |
| console.log('start event handler:' + message); | |
| }); | |
| Observable.on('processing', function(message) { | |
| console.log('processing event handler:' + message); | |
| }); | |
| Observable.on('end', function(message) { | |
| console.log('end event handler:' + message); | |
| }); | |
| Observable.doCrazyoperation(); |
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