/*
* 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.ee.logging.EeLogger;
import org.jboss.as.naming.ManagedReference;
import org.jboss.invocation.Interceptor;
import org.jboss.invocation.InterceptorContext;
/**
* 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
* ManagedReferenceReleaseInterceptor} which is run during destruction.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
class ComponentInstantiatorInterceptor implements Interceptor {
private final ComponentFactory componentFactory;
private final Object contextKey;
private final boolean setTarget;
/**
* Construct a new instance.
*
* @param componentFactory the managed reference factory to create from
* @param contextKey the context key
* @param setTarget
*/
public ComponentInstantiatorInterceptor(final ComponentFactory componentFactory, final Object contextKey, final boolean setTarget) {
this.setTarget = setTarget;
if (componentFactory == null) {
throw EeLogger.ROOT_LOGGER.nullVar("componentFactory");
}
if (contextKey == null) {
throw EeLogger.ROOT_LOGGER.nullVar("contextKey");
}
this.componentFactory = componentFactory;
this.contextKey = contextKey;
}
public Object processInvocation(final InterceptorContext context) throws Exception {
final ComponentInstance componentInstance = context.getPrivateData(ComponentInstance.class);
final ManagedReference existing = (ManagedReference) componentInstance.getInstanceData(contextKey);
if (existing == null) {
final ManagedReference reference = componentFactory.create(context);
boolean ok = false;
try {
componentInstance.setInstanceData(contextKey, reference);
if (setTarget) {
context.setTarget(reference.getInstance());
}
Object result = context.proceed();
ok = true;
return result;
} finally {
if (!ok) {
reference.release();
componentInstance.setInstanceData(contextKey, reference);
}
}
} else {
return context.proceed();
}
}
}