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From "Antonio Gallardo" <>
Subject Re: XSP not working in CVS head?
Date Mon, 17 May 2004 14:38:36 GMT
Sylvain Wallez dijo:
> The transient store (role Store.TRANSIENT_STORE) is used for objects
> that are not serializable, or whose storage doesn't make sense across
> server restart. The transient store lives on its own and has no relation
> with other stores. This is a mandatory component within Cocoon (i.e.
> used by Cocoon's code).
> The store (role Store.ROLE) is used to store objects that are
> serializable. As the transient store, it is a mandatory component.
> Some store (Store.ROLE) implementations (but not all) may actually be
> just an in-memory cache that swap objects by calling the persistent
> store (Store.PERSISTENT_STORE) when needed. So transient store is an
> _optional_ component which is used only by MRUMemoryStore, and _nowhere
> else_ in the code. When using JISP, we had this mechanism : the store
> was a MRUMemoryStore swapping to the persistent store which was a
> JISPStore.
> To sum up :
> - Store.TRANSIENT_STORE : used by Cocoon to store non-serializable objects
> - Store.ROLE : used by Cocoon to store serializable objects
> - Store.PERSISTENT_STORE : optional component that _may_ be used by
> in-memory implementations of Store.ROLE to delegate persistent storage.
> AFAIU, JCS has its own in-memory front end to the persistent storage. In
> this configuration Store.ROLE will be a JCSStore and
> Store.PERSISTENT_STORE will have no implementation (because we don't
> need it).
> But we still and will always need a TRANSIENT_STORE that doesn't require
> objects to be serializable. If JCS cannot handle this, then let's keep
> the current DefaultTransientStore (which extends MRUMemoryStore).
> Hope this clear things a bit.

Thanks master!

This piece is great! We need to add it to the documentation!

BTW, that means we can also get rid of JISPStore, right?

Best Regards,

Antonio Gallardo

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