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43 lines
1.1 KiB
JavaScript
43 lines
1.1 KiB
JavaScript
/*
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var q = Queue();
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q(id, function (next) {
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// whatever you need to do....
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// when you're done
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next(); // guaranteed to be asynchronous :D
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});
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*/
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var fix1 = function (f, x) {
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return function () { f(x); };
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};
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module.exports = function () {
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var map = {};
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var next = function (id) {
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setTimeout(function () {
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if (!map[id] || map[id].length === 0) { return void delete map[id]; }
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var task = map[id].shift();
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task(fix1(next, id));
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});
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};
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return function (id, task) {
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// support initialization with just a function
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if (typeof(id) === 'function' && typeof(task) === 'undefined') {
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task = id;
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id = '';
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}
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// ...but you really need to pass a function
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if (typeof(task) !== 'function') { throw new Error("Expected function"); }
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// if the intended queue already has tasks in progress, add this one to the end of the queue
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if (map[id]) { return void map[id].push(task); }
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// otherwise create a queue containing the given task
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map[id] = [task];
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next(id);
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};
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};
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