mirror of https://github.com/webpack/webpack.git
66 lines
1.4 KiB
JavaScript
66 lines
1.4 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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var fs = require("fs");
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function Cache(options) {
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this.options = options = options || {};
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this.map = {};
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}
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var $ = Cache.prototype;
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module.exports = Cache;
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$.get = function(request, callback) {
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var self = this;
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var item = self.map[request];
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if(!item) return callback(new Error("No Entry"));
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var count = item.files.length;
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var invalid = false;
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item.files.forEach(function(file) {
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fs.stat(file.path, function(err, stat) {
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if(err) return invalidate(err.toString());
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if(!stat) return invalidate("Cannot read stat");
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if(stat.mtime.getTime() !== file.time)
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return invalidate("File " + file.path + " has changed");
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valid();
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});
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});
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if(item.files.length === 0) valid();
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function invalidate(msg) {
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if(invalid) return;
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invalid = true;
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callback(new Error(msg));
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}
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function valid() {
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if(invalid) return;
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count--;
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if(count <= 0)
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callback(null, item.value);
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}
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}
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$.create = function(request) {
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var self = this;
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var item = {
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files: []
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};
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var cacheEntry = {
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add: function(path) {
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item.files.push({
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path: path,
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// TODO do it asynchronly
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time: fs.statSync(path).mtime.getTime()
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});
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},
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clear: function() {
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item.files.length = 0;
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},
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save: function(value) {
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item.value = value;
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self.map[request] = item;
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cacheEntry.saved = true;
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}
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}
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return cacheEntry;
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} |