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@jakecraige
Created July 21, 2016 06:10
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private func cacheError(message: String) -> NSError {
return NSError(
domain: "",
code: 0,
userInfo: [NSLocalizedDescriptionKey: message]
)
}
class MyCacheDelegate: CacheDelegate {
private var modelCache: [String: SimpleModel] = [:]
private var collectionCache: [String: [SimpleModel]] = [:]
func modelForKey<T : SimpleModel>(cacheKey: String?, context: Any?, completion: (T?, NSError?) -> ()) {
guard let cacheKey = cacheKey else {
return completion(.None, cacheError("cacheKey argument required"))
}
guard let model = modelCache[cacheKey] as? T else {
return completion(.None, cacheError(
"Object '\(String(T))' not found for key '\(cacheKey)'"
))
}
completion(model, .None)
}
func setModel<T: SimpleModel>(model: T, forKey cacheKey: String, context: Any?) {
modelCache[cacheKey] = model
}
func collectionForKey<T: SimpleModel>(cacheKey: String?, context: Any?, completion: ([T]?, NSError?) -> ()) {
guard let cacheKey = cacheKey else {
return completion(.None, cacheError("cacheKey argument required"))
}
guard let model = collectionCache[cacheKey] as? [T] else {
return completion(.None, cacheError(
"Object '\(String(T))' not found for key '\(cacheKey)'"
))
}
completion(model, .None)
}
func setCollection<T: SimpleModel>(collection: [T], forKey cacheKey: String, context: Any?) {
collectionCache[cacheKey] = collection.map { $0 as SimpleModel }
}
func deleteModel(model: SimpleModel, forKey cacheKey: String?, context: Any?) {
guard let cacheKey = cacheKey else { return }
modelCache.removeValueForKey(cacheKey)
collectionCache.removeValueForKey(cacheKey)
}
}
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