Created
December 4, 2011 19:34
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A small library to get Workers from Data/Blob URIs where supported
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="inline-worker.js"></script> | |
| </script> | |
| </head> | |
| <body> | |
| <div id="log"></div> | |
| <script> | |
| inlineWorker.onready(function(){ | |
| if (inlineWorker.working) { | |
| console.log('It works'); | |
| console.log('Worker type: ' + inlineWorker.type); | |
| } else { | |
| console.log('It doesn\'t work.'); | |
| } | |
| }); | |
| inlineWorker.onready(function(){ | |
| var log = document.getElementById('log'), | |
| worker = inlineWorker.working && inlineWorker('var x = 0; setInterval(function(){ postMessage("Hello, I am inside your Worker, sending messages. #" + x++); }, 1000);'); | |
| if (worker) { | |
| worker.onmessage = function (e) { | |
| log.innerHTML = e.data; | |
| }; | |
| } else { | |
| log.innerHTML = 'Failed to create the worker :('; | |
| } | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| var inlineWorker = (function(){ | |
| var BlobBuilder = typeof window === 'undefined' ? undefined : | |
| window.MozBlobBuilder || window.WebKitBlobBuilder || window.MSBlobBuilder || window.OBlobBuilder || window.BlobBuilder, | |
| URL = typeof window === 'undefined' ? undefined : (window.MozURL || window.webkitURL || window.MSURL || window.OURL || window.URL); | |
| /** | |
| * Creates an inline worker using a data/blob URL, if possible. | |
| * | |
| * @arg {String} script | |
| * | |
| * @return {Worker} A web worker, or null if impossible to create. | |
| */ | |
| function inlineWorker (script) { | |
| var worker = null, | |
| url, bb; | |
| try { | |
| bb = new BlobBuilder(); | |
| bb.append(script); | |
| url = URL.createObjectURL(bb.getBlob()); | |
| worker = new Worker(url); | |
| worker._terminate = worker.terminate; | |
| worker._url = url; | |
| bb = null; | |
| worker.terminate = function () { | |
| this._terminate; | |
| URL.revokeObjectURL(this._url); | |
| }; | |
| inlineWorker.type = 'blob'; | |
| return worker; | |
| } catch (e) {} | |
| try { | |
| worker = new Worker('data:text/javascript;base64,' + btoa(script)); | |
| inlineWorker.type = 'data'; | |
| return worker; | |
| } catch (e) {} | |
| return worker; | |
| } | |
| inlineWorker.ready = inlineWorker.working = false; | |
| inlineWorker.events = []; | |
| inlineWorker.test = function () { | |
| var worker = inlineWorker('this.onmessage=function(e){postMessage(e.data)}'), | |
| data = 'inlineWorker'; | |
| inlineWorker.ready = inlineWorker.working = false; | |
| function ready(success) { | |
| if (inlineWorker.ready) return; | |
| inlineWorker.ready = true; | |
| inlineWorker.working = success; | |
| while (inlineWorker.events.length) { | |
| inlineWorker.events.shift()(); | |
| } | |
| success && worker && worker.terminate(); | |
| worker = null; | |
| } | |
| if (!worker) { | |
| ready(false); | |
| } else { | |
| worker.onmessage = function (e) { | |
| ready(e.data === data); | |
| }; | |
| worker.postMessage(data); | |
| setTimeout(function () { | |
| ready(false); | |
| }, 1000); | |
| } | |
| }; | |
| inlineWorker.onready = function (callback) { | |
| inlineWorker.ready ? callback() : inlineWorker.events.push(callback); | |
| }; | |
| inlineWorker.test(); | |
| return inlineWorker; | |
| }()); |
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