Setting eviction policies dinamically
Hi guys,
I am trying to configure different eviction policies to different regions dinamically and I am facing some problems.
This is what I want:
Create an eviction policy in /NODE
Create an evcition policy in /NODE/SUBNODE_1
Create an eviction policy in /NODE/SUBNODE_2 and so on
Even create an eviction policy in /NODE/SUBNODE_1/SUBNODE_A and so on
I expected that I could create them dinamically as I am able to create them using the tree cache config file, but I have encountered some problems.
First of all, if I try to create a new eviction for, let's say /NODE/SUBNODE_1, and /NODE already had one, it throws a
RegionNameConflictException because at the time of creating the new Region (/NODE/SUBNODE_1) it checks for region conflicts. As I see in the source code, it will never allow to create a new Region under an existing one. Should work that way?
Secondly, I tried to remove any parent region of a given one from the RegionManager to avoid conlflicts from first point, and then configure all eviction policies bottom-up. That is, following last example, first I set an evcition policy to /NODE/SUBNODE_1 and then to /NODE.
In this case, it seems that everything is configured fine, but only the eviction policy configured for every subnode is working. As I see, there are no node entries in the eviction queue for the parent region, check it out yourself below:
/NODE/ class org.jboss.cache.eviction.FIFOConfiguration LFUConfiguration: maxNodes = 2 Nodes in eviction queue: 0 /NODE/SUBNODE_1 class org.jboss.cache.eviction.FIFOConfiguration LFUConfiguration: maxNodes = 5 Nodes in eviction queue: 2
This is, mainly, how I set the eviction policies:
public final void addEvictionPolicy(EvictionPolicy evictionPolicy,
String fqn) {
// Activate eviction Policies
RegionManager regionMgr = getUnderlyingTreeCache().getEvictionRegionManager();
// get EvictionConfiguration
EvictionConfiguration config = getEvictionConfiguration(evictionPolicy);
if (regionMgr.hasRegion(fqn)) {
Region region = regionMgr.getRegion(fqn);
region.setEvictionConfiguration(config);
logger.debug("Region[{}] configured with {}", fqn, somEvictionPolicy);
} else {
EvictionPolicy policy = getEvictionPolicy(evictionPolicy);
policy.configure(getUnderlyingTreeCache());
try {
regionMgr.createRegion(fqn, policy, config);
} catch (RegionNameConflictException e) {
logger.error("Region Name conflict", e);
}
logger.debug(
"Region[{}] does not exist in RegionManager. Created and configured with {}",
fqn, evictionPolicy);
}
}
Hope someone have any idea of how to set dinamically an eviction policy over a region that already its own parent region has one set. By the way, I am using JbossCache 1.4.1.SP8 and JbossAS-4.2.2
I think this is a normal case that it could come up in a real application, so I think that someone who already had at any time encountered this requirement could help me.
Thanks in advance!
