jee-modules/jsf-module/impl/src/main/java/org/apache/myfaces/extensions/cdi/jsf/impl/scope/conversation/AbstractConversationBeanEntry.java

/*
 * 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.myfaces.extensions.cdi.jsf.impl.scope.conversation;

import org.apache.myfaces.extensions.cdi.core.api.scope.conversation.event.AccessBeanEvent;
import org.apache.myfaces.extensions.cdi.core.api.scope.conversation.event.ScopeBeanEvent;
import org.apache.myfaces.extensions.cdi.core.impl.scope.conversation.spi.BeanEntry;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.BeanManager;
import java.io.Serializable;

import static org.apache.myfaces.extensions.cdi.core.impl.util.CodiUtils.createNewInstanceOfBean;

/**
 * Basic implementation of {@link BeanEntry}
 */
abstract class AbstractConversationBeanEntry<T> implements BeanEntry<T>
{
    //all implementations will be serializable
    protected CreationalContext<T> creationalContext;

    protected T currentBeanInstance;

    //all implementations will be serializable
    protected BeanManager beanManager;

    protected boolean scopeBeanEventEnable;

    protected boolean accessBeanEventEnable;

    protected boolean unscopeBeanEventEnable;

    protected AbstractConversationBeanEntry()
    {
    }

    AbstractConversationBeanEntry(CreationalContext<T> creationalContext,
                                  BeanManager beanManager,
                                  boolean scopeBeanEventEnable,
                                  boolean accessBeanEventEnable,
                                  boolean unscopeBeanEventEnable)
    {
        this.creationalContext = creationalContext;
        this.beanManager = beanManager;

        this.scopeBeanEventEnable = scopeBeanEventEnable;
        this.accessBeanEventEnable = accessBeanEventEnable;
        this.unscopeBeanEventEnable = unscopeBeanEventEnable;
    }

    /**
     * {@inheritDoc}
     */
    public CreationalContext<T> getCreationalContext()
    {
        return creationalContext;
    }

    /**
     * {@inheritDoc}
     */
    public T getBeanInstance()
    {
        if (this.currentBeanInstance == null)
        {
            //in case of a reset
            createNewBeanInstance();
        }

        if(this.accessBeanEventEnable)
        {
            //we don't have to check the implementation of Serializable - cdi already checked it
            this.beanManager.fireEvent(new AccessBeanEvent((Serializable)this.currentBeanInstance));
        }

        return this.currentBeanInstance;
    }

    /**
     * {@inheritDoc}
     */
    public T resetBeanInstance()
    {
        T oldBeanInstance = this.currentBeanInstance;

        this.currentBeanInstance = null;

        return oldBeanInstance;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isScopeBeanEventEnabled()
    {
        return this.scopeBeanEventEnable;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isAccessBeanEventEnabled()
    {
        return this.accessBeanEventEnable;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isUnscopeBeanEventEnabled()
    {
        return this.unscopeBeanEventEnable;
    }

    protected synchronized void createNewBeanInstance()
    {
        if(this.currentBeanInstance != null)
        {
            return;
        }

        this.currentBeanInstance = createNewInstanceOfBean(this.creationalContext, getBean());

        if(this.scopeBeanEventEnable)
        {
            //we don't have to check the implementation of Serializable - cdi already checked it
            this.beanManager.fireEvent(new ScopeBeanEvent((Serializable)this.currentBeanInstance));
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString()
    {
        return this.getBean().toString();
    }
}