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// Reference counter, useful for garbage collector like functionality
"use strict";
var d = require("d")
, extensions = require("../lib/registered-extensions")
, create = Object.create
, defineProperties = Object.defineProperties;
extensions.refCounter = function (ignore, conf, options) {
var cache, postfix;
cache = create(null);
postfix =
(options.async && extensions.async) || (options.promise && extensions.promise)
? "async"
: "";
conf.on("set" + postfix, function (id, length) { cache[id] = length || 1; });
conf.on("get" + postfix, function (id) { ++cache[id]; });
conf.on("delete" + postfix, function (id) { delete cache[id]; });
conf.on("clear" + postfix, function () { cache = {}; });
defineProperties(conf.memoized, {
deleteRef: d(function () {
var id = conf.get(arguments);
if (id === null) return null;
if (!cache[id]) return null;
if (!--cache[id]) {
conf.delete(id);
return true;
}
return false;
}),
getRefCount: d(function () {
var id = conf.get(arguments);
if (id === null) return 0;
if (!cache[id]) return 0;
return cache[id];
}),
});
};