Created
July 16, 2014 00:03
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Objective: I have 3 workers doing independent things, but I only want to update the app's state once they're all in the "same (synchronous) page" - meaning that if one updates, I want to wait for the others to update as well before showing the result. Reference implementation:
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="http://code.jquery.com/jquery-2.1.0.min.js"></script> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <div id="out"></div> | |
| </body> | |
| </html> |
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| // Objective: I have 3 workers doing independent things, but I only want to update the app's state once they're all in the "same (synchronous) page" - meaning that if one updates, I want to wait for the others to update as well before showing the result. Reference implementation: | |
| var wall = function(workers){ | |
| var self = {}; | |
| self.run = function(){ | |
| // when all the promises are resolved... | |
| $.when.apply(null, workers.map(function(el){ return el.promise; })).done(function(){ | |
| log(Array.prototype.splice.call(arguments, 0)); | |
| }).then(function(){ | |
| workers.forEach(function(w){ | |
| w.createNewPromise(); | |
| }); | |
| // cycle - wait for these new promises to reload | |
| self.run(); | |
| }); | |
| }; | |
| return self; | |
| }; | |
| var worker = function(name){ | |
| var self = {}; | |
| self.promise = $.Deferred(); | |
| self.load = function(){ | |
| log(name + ' loaded'); | |
| self.promise.resolve(' * Resolving for '+name); | |
| }; | |
| self.createNewPromise = function(){ | |
| self.promise = $.Deferred(); | |
| }; | |
| return self; | |
| }; | |
| var w1 = worker('worker1'); | |
| var w2 = worker('worker2'); | |
| var w3 = worker('worker3'); | |
| var wall = wall([w1,w2,w3]); | |
| wall.run(); | |
| w1.load(); | |
| w3.load(); | |
| setTimeout(function(){w2.load();}, 500); | |
| setTimeout(function(){ w3.load(); }, 2000); | |
| setTimeout(function(){ w2.load(); }, 2700); | |
| setTimeout(function(){ w1.load(); }, 3200); | |
| setTimeout(function(){ w1.load(); }, 4000); | |
| setTimeout(function(){ w3.load(); }, 4500); | |
| setTimeout(function(){ w2.load(); }, 5000); | |
| // end | |
| function log(msg){ | |
| if(!(msg instanceof Array) ){ msg = [msg]; } | |
| msg.forEach(function(m){ | |
| $('#out').append($('<p/>').text(m)); | |
| }); | |
| } |
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