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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed 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.jboss.weld.ejb;

import java.io.ObjectStreamException;
import java.io.Serializable;

import javax.interceptor.InvocationContext;

import org.jboss.weld.Container;
import org.jboss.weld.bootstrap.api.helpers.RegistrySingletonProvider;
import org.jboss.weld.context.ejb.EjbRequestContext;
import org.jboss.weld.manager.BeanManagerImpl;

/**
 * Interceptor for ensuring the request context is active during requests to EJBs.
 * 
 * Normally, a servlet will start the request context, however in non-servlet
 * requests (e.g. MDB, async, timeout) the contexts may need starting.
 * 
 * The Application context is active for duration of the deployment
 *
 * @author Pete Muir
 */
public class SessionBeanInterceptor  extends AbstractEJBRequestScopeActivationInterceptor implements Serializable {

    private static final long serialVersionUID = 2658712435730329384L;

    private volatile BeanManagerImpl beanManager;
    private transient volatile EjbRequestContext ejbRequestContext;

    @Override
    public Object aroundInvoke(InvocationContext invocation) throws Exception {
        if (beanManager == null) {
            this.beanManager = obtainBeanManager(invocation);
            this.ejbRequestContext = super.getEjbRequestContext();
        }
        return super.aroundInvoke(invocation);
    }

    private BeanManagerImpl obtainBeanManager(InvocationContext invocation) {
        Object value = invocation.getContextData().get(Container.CONTEXT_ID_KEY);
        String contextId = RegistrySingletonProvider.STATIC_INSTANCE;
        if (value instanceof String) {
            contextId = (String) value;
        }
        return Container.instance(contextId).deploymentManager();
    }

    @Override
    protected EjbRequestContext getEjbRequestContext() {
        return ejbRequestContext;
    }

    @Override
    protected BeanManagerImpl getBeanManager() {
        return beanManager;
    }

    private Object readResolve() throws ObjectStreamException {
        return new SessionBeanInterceptor();
    }
}