0 Replies Latest reply on Nov 2, 2006 5:52 AM by lost traveller

    custom timedCacheFactory problem

    lost traveller Newbie

      We have a problem whereby a user is logged out after 30 minutes and JBoss attempts to re-login, since we use a custom Principal which contains a session id the session id is lost.

      The reason a user logs out after 30 minutes is because in jboss-service.xml DefaultCacheTimeout is set to 1800 seconds. What we would like is not to specify a time but to allow a users timeout to be refreshed each time a secure method is called, which is possible because org.jboss.util.TimedCachePolicy contains a refersh() method, which is currently hard-coded to return false. So what we have done is extend TimedCachePolicy and override refresh() to refresh the timeout:

      public class TimedRefreshCachePolicy extends TimedCachePolicy implements Serializable
      {
      
       /**
       * @see org.jboss.util.TimedCachePolicy#insert(java.lang.Object, java.lang.Object)
       */
       @Override
       public void insert(Object key, Object value)
       {
       super.insert(key, new RefreshTimedEntry(getDefaultLifetime(), value));
       }
      
       /**
       * The default implementation of TimedEntry used to wrap non-TimedEntry objects inserted into the
       * cache.
       */
       static class RefreshTimedEntry implements TimedEntry, Serializable
       {
      
       private long expirationTime = -1;
      
       private Object value = null;
      
       private long lifetime = -1;
      
       RefreshTimedEntry(final long lifetime, final Object value)
       {
       this.expirationTime = 1000 * lifetime;
       this.value = value;
       this.lifetime = lifetime;
       }
      
       public void init(long now)
       {
       expirationTime += now;
       }
      
       public boolean isCurrent(long now)
       {
       return expirationTime > now;
       }
      
       public boolean refresh()
       {
       // this is called to refresh the time since the last call to this item in the
       // cache, return true to indicate that a refresh took place and that the item
       // is still valid
       expirationTime = System.currentTimeMillis() + (1000 * lifetime);
       return true;
       }
      
       public void destroy()
       {
       }
      
       public Object getValue()
       {
       return value;
       }
       }
      
      }


      According to chapter 8 we can configure our own cache policy:

      This is done by appending the name of the security domain to this name when looking up the CachePolicy for a domain


      We have create an MBean to bind TimedRefreshCachePolicy to our security domain:

      public class PetStoreService extends ServiceMBeanSupport implements PetStoreServiceMBean
      {
      ......
       new InitialContext().bind("java:/timedCacheFactory/petstore", Class.forName("com.foo.TimedRefreshCachePolicy").newInstance());
      
       Object obj0 = new InitialContext().lookup("java:/timedCacheFactory");
       Object obj1 = new InitialContext().lookup("java:/timedCacheFactory/petstore");
       Object obj3 = new InitialContext().lookup("java:/timedCacheFactory/sdmfhsjhdfcnb");
      ....
      }
      

      The problem is TimedRefreshCachePolicy won't bind to java:/timedCacheFactory/petstore in fact we can insert any text after java:/timedCacheFactory and it will return a TimedCachePolicy, from the code above:
      obj0 returns some proxy
      obj1 returns a TimedCachePolicy
      obj2 returns a TimedCachePolicy

      So how do I bind my TimedRefreshCachePolicy to java:/timedCacheFactory/petstore? or have we got this wrong and implemented it in the wrong way? We would preferably like a CachePolicy on a per domain basis, without having to change any JBoss configuration.