[jboss-user] [JBoss Cache: Core Edition] - Tile Cache, Behaviour on Eviction Help

[panratownik]

Hi. I'm designing Tile Cache for mapping service. I'm using Jboss Cache. I want to cache Tiles. Tiles are instances of class Image from SWT package. Those Images have dispose() method that should be called when You don't need the Image anymore.

I would like to invoke this method when node in cache that contains Image tile is evicted. I need this only for local cache on client application without replication and clusterring. I tried to make TileEvictionActionPolicy with such method:


  | @Override
  |   public boolean evict(Fqn fqn) {
  |     try
  |     {
  |       System.out.println("Start Eviction of: " + fqn);
  |       if (log.isTraceEnabled()) log.trace("Evicting Fqn " + fqn);
  |       Node<String, Object> node = (Node<String, Object>) cache.getNode(fqn);
  |       Image img = node.get("tile");
  |       if (img!= null && !img.isDisposed())) {
  |         img.dispose();
  |       }
  |       cache.evict(fqn);
  |       return true;
  |     }
  |     catch (Exception e)
  |     {
  |        if (log.isDebugEnabled()) log.debug("Unable to evict " + fqn, e);
  |        return false;
  |     }
  | 
  |   }
  | 

But I notice that when I call in this method cache.getNode(fqn) then I have another node evicted too and I don't know what to do.

Is there any place to controll node removal from cache. I would like to call dispose() on Image that is evicted because of node limit in LRU strategy.

//Have a nice day
//Martin

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