org.omnifaces.cdi.BeanStorage Maven / Gradle / Ivy
/*
* Copyright OmniFaces
*
* 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
*
* https://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.omnifaces.cdi;
import static org.omnifaces.util.Beans.destroy;
import java.io.Serializable;
import java.util.concurrent.ConcurrentHashMap;
import javax.enterprise.context.spi.Contextual;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.PassivationCapable;
/**
* CDI bean storage. This class is theoretically reusable for multiple CDI scopes. It's currently however only used by
* the OmniFaces CDI view scope.
*
* @author Radu Creanga {@literal }
* @author Bauke Scholtz
* @since 1.6
*/
public class BeanStorage implements Serializable {
// Constants ------------------------------------------------------------------------------------------------------
private static final long serialVersionUID = 42L;
// Properties -----------------------------------------------------------------------------------------------------
private final ConcurrentHashMap beans;
// Constructors ---------------------------------------------------------------------------------------------------
/**
* Construct a new CDI bean storage with the given initial capacity of the map holding all beans.
* @param initialCapacity The initial capacity of the map holding all beans.
*/
public BeanStorage(int initialCapacity) {
beans = new ConcurrentHashMap<>(initialCapacity);
}
// Actions --------------------------------------------------------------------------------------------------------
/**
* Create and return the bean associated with given context and creational context.
* @param The generic bean type.
* @param type The contextual type of the CDI managed bean.
* @param context The context to create the bean in.
* @return The bean associated with given context and creational context.
* @throws ClassCastException When the bean doesn't implement serializable.
*/
public T createBean(Contextual type, CreationalContext context) {
T bean = type.create(context);
beans.put(getBeanId(type), (Serializable) bean);
return bean;
}
/**
* Returns the bean associated with the given context, or null if there is none.
* @param The generic bean type.
* @param type The contextual type of the CDI managed bean.
* @return The bean associated with the given context, or null if there is none.
*/
@SuppressWarnings("unchecked")
public T getBean(Contextual type) {
return (T) beans.get(getBeanId(type));
}
/**
* Returns the bean identifier of the given type.
*/
private static String getBeanId(Contextual type) {
return (type instanceof PassivationCapable) ? ((PassivationCapable) type).getId() : type.getClass().getName();
}
/**
* Destroy all beans managed so far.
*/
public synchronized void destroyBeans() { // Not sure if synchronization is absolutely necessary. Just to be on safe side.
for (Object bean : beans.values()) {
destroy(bean);
}
beans.clear();
}
}