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27 lines
692 B
JavaScript
27 lines
692 B
JavaScript
// Limit cache size, LRU (least recently used) algorithm.
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'use strict';
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var toPosInteger = require('es5-ext/number/to-pos-integer')
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, lruQueue = require('lru-queue')
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, extensions = require('../lib/registered-extensions');
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extensions.max = function (max, conf, options) {
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var postfix, queue, hit;
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max = toPosInteger(max);
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if (!max) return;
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queue = lruQueue(max);
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postfix = (options.async && extensions.async) ? 'async' : '';
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conf.on('set' + postfix, hit = function (id) {
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id = queue.hit(id);
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if (id === undefined) return;
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conf.delete(id);
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});
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conf.on('get' + postfix, hit);
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conf.on('delete' + postfix, queue.delete);
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conf.on('clear' + postfix, queue.clear);
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};
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