/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, 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.spring.kernel;
import org.springframework.aop.TargetSource;
import org.springframework.aop.framework.ProxyFactory;
/**
* Avoid hitting delegate locator until actual bean invocation.
* Must have delegating locator set.
* By default NullLocator is delegating locator.
*
* @author <a href="mailto:ales.justin@genera-lynx.com">Ales Justin</a>
* @see NullLocator
*/
public class LazyLocator extends MicrocontainerLocatorSupport implements Locator
{
public Object locateBean(String beanName, Class targetType)
{
TargetSource targetSource = new LocatorTargetSource(beanName, targetType);
ProxyFactory proxyFactory = new ProxyFactory();
proxyFactory.addInterface(targetType);
proxyFactory.setTargetSource(targetSource);
return proxyFactory.getProxy();
}
private class LocatorTargetSource implements TargetSource
{
private String beanName;
private Class targetClass;
private Object cachedObject;
public LocatorTargetSource(String beanName, Class targetClass)
{
this.beanName = beanName;
this.targetClass = targetClass;
}
public Class getTargetClass()
{
return (this.cachedObject != null ? this.cachedObject.getClass() : this.targetClass);
}
public boolean isStatic()
{
return (this.cachedObject != null);
}
public Object getTarget() throws Exception
{
synchronized (this)
{
if (this.cachedObject == null)
{
this.cachedObject = locateBean(beanName, targetClass);
}
return this.cachedObject;
}
}
public void releaseTarget(Object target)
{
}
}
}