/*
* 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 java.util.concurrent.atomic.AtomicReference;
import org.jboss.as.naming.ManagedReference;
import org.jboss.as.naming.ManagedReferenceFactory;
import org.jboss.invocation.Interceptor;
import org.jboss.invocation.InterceptorContext;
import org.jboss.invocation.InterceptorFactory;
import org.jboss.invocation.InterceptorFactoryContext;
import static org.jboss.as.ee.EeMessages.MESSAGES;
/**
* An interceptor factory which gets an object instance from a managed resource. A reference to the resource will be
* attached to the given factory context key; the resource should be retained and passed to an instance of {@link
* org.jboss.as.ee.component.ManagedReferenceReleaseInterceptorFactory} which is run during destruction.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
class ManagedReferenceInterceptorFactory implements InterceptorFactory {
private final ManagedReferenceFactory componentInstantiation;
private final Object contextKey;
/**
* Construct a new instance.
*
* @param componentInstantiation the managed reference factory to create from
* @param contextKey the context key
*/
public ManagedReferenceInterceptorFactory(final ManagedReferenceFactory componentInstantiation, final Object contextKey) {
if (componentInstantiation == null) {
throw MESSAGES.nullVar("componentInstantiation");
}
if (contextKey == null) {
throw MESSAGES.nullVar("contextKey");
}
this.componentInstantiation = componentInstantiation;
this.contextKey = contextKey;
}
/**
* {@inheritDoc}
*/
public Interceptor create(final InterceptorFactoryContext context) {
AtomicReference<ManagedReference> referenceReference = (AtomicReference<ManagedReference>) context.getContextData().get(contextKey);
if (referenceReference == null) {
referenceReference = new AtomicReference<ManagedReference>();
context.getContextData().put(contextKey, referenceReference);
}
return new ManagedReferenceInterceptor(componentInstantiation, referenceReference);
}
static final class ManagedReferenceInterceptor implements Interceptor {
private final ManagedReferenceFactory componentInstantiator;
private final AtomicReference<ManagedReference> referenceReference;
public ManagedReferenceInterceptor(final ManagedReferenceFactory componentInstantiator, final AtomicReference<ManagedReference> referenceReference) {
this.componentInstantiator = componentInstantiator;
this.referenceReference = referenceReference;
}
public Object processInvocation(final InterceptorContext context) throws Exception {
final ManagedReference existing = referenceReference.get();
if (existing == null) {
final ManagedReference reference = componentInstantiator.getReference();
boolean ok = false;
try {
referenceReference.set(reference);
context.setTarget(reference.getInstance());
Object result = context.proceed();
ok = true;
return result;
} finally {
context.setTarget(null);
if (!ok) {
reference.release();
referenceReference.set(null);
}
}
} else {
return context.proceed();
}
}
}
}