[jboss-user] [JBoss Cache: Core Edition] - Setting eviction policies dinamically

Sancheski do-not-reply at jboss.com
Mon May 5 13:09:20 EDT 2008


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! 
  | 
  | 

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