Hi,
I'm in a situation where I would like to have an exclusive lock on only the leaf node
in a tree.
E.g. suppose I have a tree with entries "/a/b/n1" and "/a/b/n2". When
Tx1 accesses "/a/b/n1", Tx2 should not be able to also access (either read or
write) "/a/b/n1" until Tx1 has completed and released its locks. However,
meanwhile Tx3 should be able to access "/a/b/n2".
With isolation level SERIALIZABLE, the entire tree is exclusively locked. E.g. when Tx1 in
the above example accesses "/a/b/n1" and writes to n1, it has a read lock on a
and b and a write lock on n1. If meanwhile Tx3 wants to access "/a/b/n2", it
already fails to acquire the read lock on "/a", making it impossible to reach
"/a/b" and "a/b/n2"
The lower isolation levels also don't work for my usecase. E.g. when Tx1 accesses
"/a/b/n1" and reads n1, Tx2 is also able to read n1 at the same time, which is
what should not be allowed.
In short, I would like to be able to have SERIALIZABLE semantics per specific sub-tree
instead of the whole tree.
Is something like that possible with JbossCache?
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