Created
November 25, 2012 18:56
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Backbone Collection Cache
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| define [], ()-> | |
| CollectionCache = -> | |
| cache = {} | |
| # returns true if the cache has the given key already | |
| cacheHasKey = (key)-> | |
| cache.hasOwnProperty key | |
| # generates a unique key from given arguments | |
| genKey = (args)-> | |
| MD5(JSON.stringify(args)) | |
| # creates an instance, caches it, and returns the instance | |
| # the trick here is how the instance is created with a dynamic set of arguments | |
| set = (klass, args, key)-> | |
| F = (args)-> | |
| return klass.apply(@, args) | |
| F.prototype = klass.prototype | |
| instance = new F(args) | |
| cache[key] = instance | |
| # returns a collection instance and caches it if needed | |
| get: ()-> | |
| klass = Array::shift.call arguments | |
| key = genKey arguments | |
| if cacheHasKey(key) | |
| cache[key] | |
| else | |
| set klass, arguments, key | |
| CollectionCache |
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