In order to fix a problem with the cache, I would like to add a pointer type to
the storage api.
The problem with the cache is there are multiple names which, when asked of the
persistent store,
return the same document. There is no effective way to know what all names
which will return that
document. When a document is modified, it is removed from the cache but the
only version removed is it's
"real" name. All of the other names for it linger in the cache eating up memory
and threatening to
provide someone stale data.
Instead of caching the document, we could cache a pointer to the document and
when it became stale,
the pointer could be set to null and then any other name under which that
document was cached would look
up a null pointer and the cache logic could remove it.
I would like to add it to xwiki-platform-store-api module and it will look
roughly like this:
package org.xwiki.store;
public final class Pointer<T>
{
/** The thing which this pointer points to. */
public T target;
}
WDYT?
Caleb
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