91 lines
2.7 KiB
JavaScript
91 lines
2.7 KiB
JavaScript
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/* eslint consistent-this: 0 */
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// Timeout cached values
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"use strict";
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var aFrom = require("es5-ext/array/from")
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, forEach = require("es5-ext/object/for-each")
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, nextTick = require("next-tick")
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, isPromise = require("is-promise")
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, timeout = require("timers-ext/valid-timeout")
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, extensions = require("../lib/registered-extensions");
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var noop = Function.prototype, max = Math.max, min = Math.min, create = Object.create;
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extensions.maxAge = function (maxAge, conf, options) {
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var timeouts, postfix, preFetchAge, preFetchTimeouts;
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maxAge = timeout(maxAge);
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if (!maxAge) return;
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timeouts = create(null);
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postfix =
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(options.async && extensions.async) || (options.promise && extensions.promise)
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? "async"
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: "";
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conf.on("set" + postfix, function (id) {
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timeouts[id] = setTimeout(function () { conf.delete(id); }, maxAge);
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if (typeof timeouts[id].unref === "function") timeouts[id].unref();
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if (!preFetchTimeouts) return;
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if (preFetchTimeouts[id]) {
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if (preFetchTimeouts[id] !== "nextTick") clearTimeout(preFetchTimeouts[id]);
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}
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preFetchTimeouts[id] = setTimeout(function () {
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delete preFetchTimeouts[id];
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}, preFetchAge);
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if (typeof preFetchTimeouts[id].unref === "function") preFetchTimeouts[id].unref();
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});
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conf.on("delete" + postfix, function (id) {
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clearTimeout(timeouts[id]);
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delete timeouts[id];
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if (!preFetchTimeouts) return;
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if (preFetchTimeouts[id] !== "nextTick") clearTimeout(preFetchTimeouts[id]);
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delete preFetchTimeouts[id];
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});
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if (options.preFetch) {
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if (options.preFetch === true || isNaN(options.preFetch)) {
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preFetchAge = 0.333;
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} else {
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preFetchAge = max(min(Number(options.preFetch), 1), 0);
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}
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if (preFetchAge) {
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preFetchTimeouts = {};
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preFetchAge = (1 - preFetchAge) * maxAge;
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conf.on("get" + postfix, function (id, args, context) {
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if (!preFetchTimeouts[id]) {
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preFetchTimeouts[id] = "nextTick";
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nextTick(function () {
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var result;
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if (preFetchTimeouts[id] !== "nextTick") return;
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delete preFetchTimeouts[id];
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conf.delete(id);
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if (options.async) {
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args = aFrom(args);
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args.push(noop);
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}
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result = conf.memoized.apply(context, args);
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if (options.promise) {
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// Supress eventual error warnings
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if (isPromise(result)) {
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if (typeof result.done === "function") result.done(noop, noop);
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else result.then(noop, noop);
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}
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}
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});
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}
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});
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}
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}
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conf.on("clear" + postfix, function () {
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forEach(timeouts, function (id) { clearTimeout(id); });
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timeouts = {};
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if (preFetchTimeouts) {
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forEach(preFetchTimeouts, function (id) { if (id !== "nextTick") clearTimeout(id); });
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preFetchTimeouts = {};
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}
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});
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};
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