Read this article , Dealt with top 20 GC articles.

Repository, A new pattern

Most of the client -- Server application use a pattern called repository http://en.wikipedia.org/wiki/Repository.

Responsibilities :
- Cache (use it internally).
- reducing calling the server.
- Storage
- Provide base funtionllilty and abstract implementation over the repository,
- Offline warehouse.
- Middle tier between the client and server.

Repository problems,
- Decrease performance.
- Redundant calls to server.
- Not an abstract - Coupled to concrete implication.

The following new design of - ITEM SET repository, Give a new way of repository implementation.

So,

Item set

To be continue...