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| /* | |
| function queue | |
| based on | |
| https://stackoverflow.com/questions/17528749/semaphore-like-queue-in-javascript/17528961#17528961 | |
| */ | |
| var Queue = (function(){ | |
| function Queue(autorun) { | |
| if (typeof autorun !== "undefined") { | |
| this.autorun = autorun; | |
| } | |
| this.queue = []; //initialize the queue | |
| } | |
| Queue.prototype.autorun = true; | |
| Queue.prototype.running = false; | |
| Queue.prototype.queue = []; | |
| Queue.prototype.add = function(callback) { | |
| var _this = this; | |
| //add callback to the queue | |
| this.queue.push(function() { | |
| var finished = callback(); | |
| if (typeof finished === "undefined" || finished) { | |
| // if callback returns `false`, then you have to | |
| // call `next` somewhere in the callback | |
| _this.dequeue(); | |
| } | |
| }); | |
| if (this.autorun && !this.running) { | |
| // if nothing is running, then start the engines! | |
| this.dequeue(); | |
| } | |
| return this; // for chaining fun! | |
| }; | |
| Queue.prototype.dequeue = function() { | |
| this.running = false; | |
| //get the first element off the queue | |
| var shift = this.queue.shift(); | |
| if (shift) { | |
| this.running = true; | |
| shift(); | |
| } | |
| return shift; | |
| }; | |
| Queue.prototype.next = Queue.prototype.dequeue; | |
| return Queue; | |
| })(); | |
| // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
| var fqueue = new Queue(); | |
| function say(msg,cb){ | |
| console.log('say:',msg); | |
| cb(); | |
| } | |
| function shout(msg,cb){ | |
| console.log('shout:',msg); | |
| } | |
| function wisper(msg,cb){ | |
| console.log('wisper:',msg); | |
| } | |
| function cb(){ | |
| console.log('done'); | |
| } | |
| fqueue.add(function(){say('hello',cb);}); | |
| setTimeout(function(){ | |
| fqueue.add(function(){shout('Hey');}); | |
| },1000); | |
| setTimeout(function(){ | |
| fqueue.add(function(){wisper('can you hear me?');}); | |
| },2000); | |
| setTimeout(function(){ | |
| for (i=0;i<50;i++){ | |
| fqueue.add(function(){say('job id='+ i.toString(),cb);}); | |
| } | |
| },3000); |
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