/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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.as.ee.component;
import org.jboss.as.naming.ManagedReference;
import org.jboss.as.naming.ManagedReferenceFactory;
import org.jboss.invocation.Interceptor;
import org.jboss.invocation.InterceptorContext;
import java.lang.reflect.Field;
import java.util.concurrent.atomic.AtomicReference;
/**
* An interceptor which constructs and injects a managed reference into a field. The context key given
* for storing the reference should be passed to a {@link org.jboss.as.ee.component.ManagedReferenceReleaseInterceptor} which is run during
* object destruction.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
final class ManagedReferenceFieldInjectionInterceptor implements Interceptor {
private final AtomicReference<ManagedReference> targetReference;
private final AtomicReference<ManagedReference> valueReference;
private final ManagedReferenceFactory factory;
private final Field field;
ManagedReferenceFieldInjectionInterceptor(final AtomicReference<ManagedReference> targetReference, final AtomicReference<ManagedReference> valueReference, final ManagedReferenceFactory factory, final Field field) {
this.targetReference = targetReference;
this.valueReference = valueReference;
this.factory = factory;
this.field = field;
}
/** {@inheritDoc} */
public Object processInvocation(final InterceptorContext context) throws Exception {
Object target = targetReference.get().getInstance();
if (target == null) {
throw new IllegalStateException("No injection target found");
}
ManagedReference reference = factory.getReference();
boolean ok = false;
try {
valueReference.set(reference);
field.set(target, reference.getInstance());
Object result = context.proceed();
ok = true;
return result;
} finally {
if (! ok) {
valueReference.set(null);
reference.release();
}
}
}
}