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116 lines
2.3 KiB
JavaScript
116 lines
2.3 KiB
JavaScript
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/**
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* @provides javelin-router
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* @requires javelin-install
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* javelin-util
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* @javelin
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*/
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/**
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* Route requests. Primarily, this class provides a quality-of-service
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* priority queue so large numbers of background loading tasks don't block
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* interactive requests.
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*/
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JX.install('Router', {
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construct: function() {
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this._queue = [];
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},
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events: ['queue', 'start', 'done'],
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members: {
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_queue: null,
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_active: 0,
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_limit: 5,
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queue: function(routable) {
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this._queue.push(routable);
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this.invoke('queue', routable);
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this._update();
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},
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getRoutableByKey: function(key) {
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for (var ii = 0; ii < this._queue.length; ii++) {
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if (this._queue[ii].getKey() == key) {
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return this._queue[ii];
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}
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}
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return null;
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},
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/**
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* Start new requests if we have slots free for them.
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*/
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_update: function() {
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var active = this._active;
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var limit = this._limit;
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if (active >= limit) {
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// If we're already at the request limit, we can't add any more
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// requests.
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return;
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}
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// If we only have one free slot, we reserve it for a request with
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// at least priority 1000.
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var minimum;
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if ((active + 1) == limit) {
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minimum = 1000;
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} else {
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minimum = 0;
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}
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var idx = this._getNextRoutable(minimum);
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if (idx === null) {
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return;
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}
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var routable = this._queue[idx];
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this._queue.splice(idx, 1);
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routable.listen('done', JX.bind(this, this._done, routable));
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this._active++;
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routable.start();
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this.invoke('start', routable);
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this._update();
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},
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_done: function(routable) {
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this._active--;
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this.invoke('done', routable);
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this._update();
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},
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_getNextRoutable: function(minimum) {
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var best = (minimum - 1);
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var routable = null;
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for (var ii = 0; ii < this._queue.length; ii++) {
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var priority = this._queue[ii].getPriority();
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if (priority > best) {
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best = priority;
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routable = ii;
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}
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}
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return routable;
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}
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},
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statics: {
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_instance: null,
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getInstance: function() {
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if (!JX.Router._instance) {
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JX.Router._instance = new JX.Router();
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}
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return JX.Router._instance;
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}
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}
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});
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