michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 'use strict';
michael@0: 
michael@0: module.metadata = {
michael@0:   'stability': 'experimental'
michael@0: };
michael@0: 
michael@0: const method = require('../../method/core');
michael@0: const { uuid } = require('../util/uuid');
michael@0: 
michael@0: // NOTE: use lang/functional memoize when it is updated to use WeakMap
michael@0: function memoize(f) {
michael@0:   const memo = new WeakMap();
michael@0: 
michael@0:   return function memoizer(o) {
michael@0:     let key = o;
michael@0:     if (!memo.has(key))
michael@0:       memo.set(key, f.apply(this, arguments));
michael@0:     return memo.get(key);
michael@0:   };
michael@0: }
michael@0: 
michael@0: let identify = method('identify');
michael@0: identify.define(Object, memoize(function() { return uuid(); }));
michael@0: exports.identify = identify;