Hi;
In section 8.1 of the TreeCache documentation (and related
docs/design/EvictionPolicy.txt), it says that when a node is evicted, it will
only be removed if it does not have children.
I understand why this is desirable in some cases, but I have a slightly
different requirement.
In my case, if a node is ready to be evicted, all of its children must be
evicted at the same time. Basically, I want the whole family of the Fqn in
question to be evicted at the same time.
After digging through the code a bit, I see that BaseEvictionPolicy is calling
TreeCache._evict(Fqn) which in turn is checking to see if the evicted node has
children, and if so, it only removes the data by calling _removeData().
Now to the questions.
1. Are there any plans in the roadmap to support the kind of forceful eviction
policy I need in JBoss Cache?
2. Are there any side effects with me implementing a new LRUPolicy that
forcefully evicts a node and its children?
3. Any advice on how to do #2? Off the top of my head I would probably create a
new CascadingLRUPolicy class that overrides the evict(Fqn) method to accomplish
what I need to do. The new evict() implementation would be largely a copy/paste
of TreeCache._evict() but thatt doesn't check for children. Here's a quick
mock-up of what the new CascadingLRUPolicy.evict(Fqn) implemention might look
like:
public void _evict(Fqn fqn) throws Exception {
if(!cache_.exists(fqn)) return; // node does not exist. Maybe it has
been recursively removed.
// use remove method now if there is a child node. Otherwise, it is
removed
boolean create_undo_ops = false;
boolean sendNodeEvent = false;
boolean eviction=true;
_remove(null, fqn, create_undo_ops, sendNodeEvent, eviction);
}
Thanks in advance for any/all help.
Regards,
Brian Dueck
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