| 1 | module.exports = ChainInstance; |
| 2 | |
| 3 | function ChainInstance(chain, cb) { |
| 4 | var instances = null; |
| 5 | var loading = false; |
| 6 | var queue = []; |
| 7 | |
| 8 | var load = function () { |
| 9 | loading = true; |
| 10 | chain.run(function (err, items) { |
| 11 | instances = items; |
| 12 | |
| 13 | return next(); |
| 14 | }); |
| 15 | }; |
| 16 | var promise = function(hwd, next) { |
| 17 | return function () { |
| 18 | if (!loading) { |
| 19 | load(); |
| 20 | } |
| 21 | |
| 22 | queue.push({ hwd: hwd, args: arguments }); |
| 23 | |
| 24 | return calls; |
| 25 | }; |
| 26 | }; |
| 27 | var next = function () { |
| 28 | if (queue.length === 0) return; |
| 29 | |
| 30 | var item = queue.shift(); |
| 31 | |
| 32 | item.hwd.apply(calls, item.args); |
| 33 | }; |
| 34 | var calls = { |
| 35 | filter: promise(function (cb) { |
| 36 | instances = instances.filter(cb); |
| 37 | |
| 38 | return next(); |
| 39 | }), |
| 40 | forEach: promise(function (cb) { |
| 41 | instances.forEach(cb); |
| 42 | |
| 43 | return next(); |
| 44 | }), |
| 45 | sort: promise(function (sortFn) { |
| 46 | instances.sort(sortFn); |
| 47 | |
| 48 | return next(); |
| 49 | }), |
| 50 | count: promise(function (cb) { |
| 51 | cb(instances.length); |
| 52 | |
| 53 | return next(); |
| 54 | }), |
| 55 | get: promise(function (cb) { |
| 56 | cb(instances); |
| 57 | |
| 58 | return next(); |
| 59 | }), |
| 60 | save: promise(function (cb) { |