TO DO - Uize.Services.Store
This is a TO DO document for the Uize.Services.Store module.
1. Adapter Base Class
In order to endow all adapters of the Uize.Services.Store service with certain useful features, an adapter base class should be provided that can be subclassed by any adapter implementation.
Responsibilities of the adapter...
| access caching to improve performance | |
| provide a caching layer, to avoid constant setItem and getItem calls | |
| serialize / deserialize to and from string, for adapters that only support string storage |
2. Adapters
The following adapters could be implemented for the Uize.Services.Store service.
Uize.Services.StoreAdapter.FileSytem - would use the Uize.Services.FileSystem service to store data in a file using the file system |
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Uize.Services.StoreAdapter.BrowserLocalStorage - would use the browser's local storage facility |
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Uize.Services.StoreAdapter.Flash - would store using a Flash swf |
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Uize.Services.StoreAdapter.IeActiveX - would store using an ActiveX control in MSIE |
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Uize.Services.StoreAdapter.Cookies - would use the browser cookies |
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Uize.Services.StoreAdapter.Memory - would store in JavaScript memory |
3. Caching Behavior
The adapter base class for the store service could provide a generic caching layer, to minimize usage of the external storage system which can be costly for some storage mechanisms.
3.1. Cache Warming
The adapter base class can provide a mechanism for warming the cache by getting items from the external storage system and seeding them into the in-memory cache object.
| ability to specify maxItems to load into cache | |
| ability to specify maxTime spent warming cache | |
| ability to specify specific items to cache | |
| lazy warming of cache, if cache enabled and item not cached | |
| ability to warm cache as part of initialization |
3.2. Cache Requirements
| enable or disable caching at any time | |
| ability to clear items from cache | |
| ability to clear entire cache |
4. Serialization / Deserilization
| per adapter subclass, ability to declare if adapter only supports storage in string form | |
| per instance of service, ability to configure serializer / deserializer for adapters that only support storage in string form |
5. Data Persistence
Adapters for the Uize.Services.Store can provide varying degrees of persistence of the data.