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48 lines
1.3 KiB
48 lines
1.3 KiB
12 years ago
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var caching = function(args) {
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args = args || {};
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var self = {};
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self.store_name = args.store || 'redis';
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self.store = require('./stores/' + self.store_name).create(args);
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/**
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* Wraps a function in cache. I.e., the first time the function is run,
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* its results are stored in cache so subsequent calls retrieve from cache
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* instead of calling the function.
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*
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* @example
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*
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* var key = 'user_' + user_id;
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* cache.run(key, function(cb) {
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* user_adapter.get(user_id, cb);
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* }, function(err, user) {
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* console.log(user);
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* });
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*/
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self.run = function(key, work, cb) {
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self.store.get(key, function(err, result) {
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if (err) { return cb(err); }
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if (result) {
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return cb(null, result);
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}
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work(function() {
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var work_args = Array.prototype.slice.call(arguments, 0);
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self.store.set(key, work_args[1], function(err) {
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if (err) { return cb(err); }
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cb.apply(null, work_args);
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});
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});
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});
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};
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self.get = self.store.get;
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self.set = self.store.set;
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self.del = self.store.del;
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return self;
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};
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module.exports = caching;
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