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27 lines
737 B
27 lines
737 B
// 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) || (options.promise && extensions.promise) |
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? "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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