cleanup Ox.queue

source/Ox/js/Function.js

@@ -82,3 +82,40 @@ Ox.noop = function() {
     var callback = Ox.last(arguments);
     Ox.isFunction(callback) && callback();
 };
+
+/*@
+Ox.queue <f> Queue of asynchronous function calls with cached results
+    The results are cached based on all but the last argument, which is the
+    callback.
+    fn <f> function
+    maxThreads <n> Number of parallel function calls
+    callback <f> Callback function
+        result <*> Result
+@*/
+Ox.queue = function(fn, maxThreads) {
+    var maxThreads = maxThreads || 10,
+        queue = [],
+        threads = 0;
+    function process() {
+        var n = Math.min(queue.length, maxThreads - threads);
+        if (n) {
+            threads += n;
+            Ox.parallelForEach(queue.splice(0, n), function(args, index, array, callback) {
+                fn.apply(this, args.slice(0, -1).concat(function(result) {
+                    threads--;
+                    args.slice(-1)[0](result);
+                    callback();
+                }));
+            }, process);
+        }
+    }
+    return Ox.cache(function() {
+        queue.push(Ox.toArray(arguments));
+        process();
+    }, {
+        async: true,
+        key: function(args) {
+            return JSON.stringify(args.slice(0, -1));
+        }
+    });
+};