/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.webbeans.intercept;
import javax.enterprise.context.spi.Context;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.UnproxyableResolutionException;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.PassivationCapable;
import javax.inject.Provider;
import java.io.ObjectStreamException;
import java.io.Serializable;
import org.apache.webbeans.config.WebBeansContext;
/**
* <p>A Provider which handles all NormalScoped proxying.
* It's two main responsibilities are to provide the one active
* Contextual Instance, the second is to provide serialisation.</p>
*
* <p>The generated proxy will writeReplace() with this class and any
* NormalScopedBean provider must readResolve() and regenerate the
* proxy class from the {@link org.apache.webbeans.proxy.NormalScopeProxyFactory}
* again.
* </p>
* <p>Any subclass should either declare all their fields <code>transient</code>
* or handle the serialisation properly!</p>
*/
public class NormalScopedBeanInterceptorHandler implements Provider, Serializable
{
private transient BeanManager beanManager;
protected transient Bean<?> bean;
/**
* The passivation if in case this is a {@link PassivationCapable} bean.
* we just keep this field for serializing it away
*/
private String beanPassivationId;
public NormalScopedBeanInterceptorHandler(BeanManager beanManager, Bean<?> bean)
{
this.beanManager = beanManager;
this.bean = bean;
if (bean instanceof PassivationCapable)
{
beanPassivationId = ((PassivationCapable) bean).getId();
}
}
@Override
public Object get()
{
return getContextualInstance();
}
public Bean<?> getBean()
{
return bean;
}
protected BeanManager getBeanManager()
{
return beanManager;
}
protected Object getContextualInstance()
{
Object webbeansInstance;
//Context of the bean
Context webbeansContext = beanManager.getContext(bean.getScope());
//Already saved in context?
webbeansInstance = webbeansContext.get(bean);
if (webbeansInstance != null)
{
// voila, we are finished if we found an existing contextual instance
return webbeansInstance;
}
// finally, we create a new contextual instance
CreationalContext cc = beanManager.createCreationalContext(bean);
webbeansInstance = webbeansContext.get(bean, cc);
if (webbeansInstance == null)
{
throw new UnproxyableResolutionException("Cannot find a contextual instance of bean " + bean.toString());
}
return webbeansInstance;
}
/**
* The following code gets generated into the proxy:
*
* <pre>
* Object writeReplace() throws ObjectStreamException
* {
* return provider;
* }
* </pre>
*/
protected Object readResolve() throws ObjectStreamException
{
WebBeansContext webBeansContext = WebBeansContext.getInstance();
this.beanManager = webBeansContext.getBeanManagerImpl();
this.bean = beanManager.getPassivationCapableBean(beanPassivationId);
return webBeansContext.getNormalScopeProxyFactory().createNormalScopeProxy(bean);
}
}