package org.jboss.resteasy.plugins.server.resourcefactory;

import org.jboss.resteasy.spi.HttpRequest;
import org.jboss.resteasy.spi.HttpResponse;
import org.jboss.resteasy.spi.ResourceFactory;
import org.jboss.resteasy.spi.ResteasyProviderFactory;

import javax.naming.InitialContext;
import javax.naming.NamingException;

/**
 * Used for component jndi-based resources like EJBs.
 *
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
public class JndiComponentResourceFactory implements ResourceFactory
{
   private String jndiName;
   private InitialContext ctx;
   private volatile Object reference;
   private Class scannable;
   private boolean cache;


   public JndiComponentResourceFactory(String jndiName, Class scannable, boolean cacheReference)
   {
      this.jndiName = jndiName;
      this.scannable = scannable;
      this.cache = cacheReference;
      try
      {
         ctx = new InitialContext();
      }
      catch (NamingException e)
      {
         throw new RuntimeException(e);
      }
   }

   public void registered(ResteasyProviderFactory factory)
   {
   }

   public Object createResource(HttpRequest request, HttpResponse response, ResteasyProviderFactory factory)
   {
      if (reference != null) return reference;
      Object ref = reference;
      if (ref == null)
      {
         try
         {
            ref = ctx.lookup(jndiName);
         }
         catch (NamingException e)
         {
            throw new RuntimeException(e);
         }
         if (cache)
         {
            synchronized (this)
            {
               reference = ref;
            }
         }
      }
      return ref;
   }

   public void unregistered()
   {
   }

   public Class<?> getScannableClass()
   {
      return scannable;
   }

   public void requestFinished(HttpRequest request, HttpResponse response, Object resource)
   {
   }
}