CacheLoader

[klchan]

I presume the CacheLoader Interface is used for persisting the cache to either file or database. Correct me if I am wrong?

I like to know if there is any implementation of the CacheLoader right now? If not, when will there be an implementation or how should I implement/use it?

I like to use it to re-populate the cache from database after a server restart. I have a cluster of 2 machines and each machine has its own local database.

Any advice or help is greatly appreciated.

thanks.

[belaban]

// I presume the CacheLoader Interface is used for
// persisting the cache to either file or database.
// Correct me if I am wrong?

Yes.


// I like to know if there is any implementation of the
// CacheLoader right now? If not, when will there be
// an implementation or how should I implement/use it?


No, there is not yet an implementation. I'm still working on the use cases. You can look at the use case document, it is in cache/docs/design/CacheLoader.txt (CVS head).

I have the use case down for a shared cacheloader, but I want to go through use cases in which each node has its own local DB. This might change the interfaces slightly. I hope to be done by mid April.
The tasks that remain are
- flesh out the interface, see whether it covers all use cases
- Call the cacheloader at the right time from TreeCache

// I like to use it to re-populate the cache from
// database after a server restart. I have a cluster of
// 2 machines and each machine has its own local
// database.

You could do this using a client app, which reads from the DB and simply inserts. The CacheLoader will do a state transfer for the 2nd node and (optionally) lazily populate the cache.

Bela

[klchan]

Thanks Bela for yr reponse.

Do u mean to say that u will have [1] the use cases or [2] the implementation ready by mid April?

If [2], then I would be glad to test and use it, else I may have to decide to find another solution.

thanks again.

[belaban]

I should have the hooks in place by mid April. I might also provide a simple file-based implementation to see whether everything works.

We plane to provide a file-based impl, a DB impl, and maybe an impl based on Sleepycat's Java DB.

Bela