SeamResteasyResourceFactory.java

/*
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 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.seam.resteasy;

import org.jboss.resteasy.spi.ResourceFactory;
import org.jboss.resteasy.spi.InjectorFactory;
import org.jboss.resteasy.spi.HttpRequest;
import org.jboss.resteasy.spi.HttpResponse;
import org.jboss.resteasy.spi.ResteasyProviderFactory;
import org.jboss.resteasy.core.PropertyInjectorImpl;

import org.jboss.seam.contexts.Contexts;
import org.jboss.seam.Component;
import org.jboss.seam.log.Log;
import org.jboss.seam.log.Logging;

/**
 * Looks up Seam component in Seam contexts when a JAX-RS resource is requested.
 *
 * @author Christian Bauer
 */
public class SeamResteasyResourceFactory implements ResourceFactory
{
   Log log = Logging.getLog(SeamResteasyResourceFactory.class);

   private final Class<?> resourceType;
   private final Component seamComponent;
   private final ResteasyProviderFactory providerFactory;

   public SeamResteasyResourceFactory(Class<?> resourceType, Component seamComponent, ResteasyProviderFactory providerFactory)
   {
      this.resourceType = resourceType;
      this.seamComponent = seamComponent;
      this.providerFactory = providerFactory;
   }

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

   public void registered(InjectorFactory factory)
   {
      // Wrap the Resteasy PropertyInjectorImpl in a Seam interceptor (for @Context injection)
      seamComponent.addInterceptor(
            new ResteasyContextInjectionInterceptor(
                  new PropertyInjectorImpl(getScannableClass(), providerFactory)
            )
      );

      // NOTE: Adding an interceptor to Component at this stage means that the interceptor is
      // always executed last in the chain. The sorting of interceptors of a Component occurs
      // only when the Component metadata is instantiated. This is OK in this case, as the
      // JAX RS @Context injection can occur last after all other interceptors executed.

   }

   public Object createResource(HttpRequest request, HttpResponse response, InjectorFactory factory)
   {
      // Push this onto event context so we have it available in ResteasyContextInjectionInterceptor
      Contexts.getEventContext().set(ResteasyContextInjectionInterceptor.RE_HTTP_REQUEST_VAR, request);
      Contexts.getEventContext().set(ResteasyContextInjectionInterceptor.RE_HTTP_RESPONSE_VAR, response);
      log.debug("creating RESTEasy resource instance by looking up Seam component: " + seamComponent.getName());
      return Component.getInstance(seamComponent.getName());
   }

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

   public void unregistered()
   {
   }

}