43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
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/**
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* How to use:
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*
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* 1. Insert "ReferenceCounter.add('unique key'); after "addEventListener()"
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* 2. Insert "ReferenceCounter.remove('unique key'); after "removeEventListener()"
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* 3. Open and close windows multiple times.
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* 4. Go to the browser console and run the script:
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* (function() { let { ReferenceCounter } = Components.utils.import('resource://treestyletab-modules/ReferenceCounter.js', {}); return ReferenceCounter.report() })();
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*
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* Expected result for good case:
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*
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* Blank array is returned.
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*
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* Expected result for bad case:
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*
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* Not-removed counters are reported as the elements of the returned array.
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*/
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"use strict";
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var EXPORTED_SYMBOLS = ['ReferenceCounter'];
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var ReferenceCounter = {
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_listeners: {},
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add: function(aKey) {
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this._listeners[aKey] = this._listeners[aKey] || 0;
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this._listeners[aKey]++;
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},
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remove: function(aKey) {
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this._listeners[aKey] = this._listeners[aKey] || 0;
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this._listeners[aKey]--;
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},
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report: function() {
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var keys = [];
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Object.keys(this._listeners).forEach(function(aKey) {
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if (this._listeners[aKey] <= 1)
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return;
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keys.push(aKey+'('+this._listeners[aKey]+')');
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}, this);
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return keys;
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}
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};
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