/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat, Inc. and/or its affiliates, 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.bean.proxy;
import static org.jboss.weld.util.reflection.Reflections.cast;
import java.io.Serializable;
import javax.enterprise.context.spi.Context;
import javax.enterprise.inject.spi.Bean;
import org.jboss.weld.Container;
import org.jboss.weld.context.CreationalContextImpl;
import org.jboss.weld.context.WeldCreationalContext;
import org.jboss.weld.injection.CurrentInjectionPoint;
import org.jboss.weld.injection.EmptyInjectionPoint;
import org.jboss.weld.logging.BeanLogger;
import org.jboss.weld.serialization.spi.BeanIdentifier;
import org.jboss.weld.serialization.spi.ContextualStore;
import edu.umd.cs.findbugs.annotations.SuppressWarnings;
/**
* An instance locator that uses a context to lookup the instance if
* it exists; otherwise, a new instance will be created from the
* bean.
*
* @author David Allen
*/
@SuppressWarnings(value = "SE_TRANSIENT_FIELD_NOT_RESTORED", justification = "bean field is loaded lazily")
public class ContextBeanInstance<T> extends AbstractBeanInstance implements Serializable {
private static final long serialVersionUID = -8144230657830556503L;
// The bean
private transient Bean<T> bean;
// The bean index in the manager
private final BeanIdentifier id;
private final String contextId;
// The actual type of the resulting bean instance
private final Class<?> instanceType;
private static final ThreadLocal<WeldCreationalContext<?>> currentCreationalContext = new ThreadLocal<WeldCreationalContext<?>>();
/**
* Creates a new locator for instances of the given bean.
*
* @param bean The contextual bean
* @param id The unique identifier of this bean
*/
public ContextBeanInstance(Bean<T> bean, BeanIdentifier id, String contextId) {
this.bean = bean;
this.id = id;
this.contextId = contextId;
this.instanceType = computeInstanceType(bean);
BeanLogger.LOG.createdContextInstance(bean, id);
}
public T getInstance() {
Container container = Container.instance(contextId);
if (bean == null) {
bean = container.services().get(ContextualStore.class).<Bean<T>, T>getContextual(id);
}
Context context = container.deploymentManager().getContext(bean.getScope());
T existingInstance = context.get(bean);
if (existingInstance != null) {
return existingInstance;
}
WeldCreationalContext<T> creationalContext;
WeldCreationalContext<?> previousCreationalContext = currentCreationalContext.get();
if (previousCreationalContext == null) {
creationalContext = new CreationalContextImpl<T>(bean);
} else {
creationalContext = previousCreationalContext.getCreationalContext(bean);
}
final CurrentInjectionPoint currentInjectionPoint = container.services().get(CurrentInjectionPoint.class);
currentCreationalContext.set(creationalContext);
try {
// Ensure that there is no injection point associated
currentInjectionPoint.push(EmptyInjectionPoint.INSTANCE);
return context.get(bean, creationalContext);
} finally {
currentInjectionPoint.pop();
if (previousCreationalContext == null) {
currentCreationalContext.remove();
} else {
currentCreationalContext.set(previousCreationalContext);
}
}
}
public Class<T> getInstanceType() {
return cast(instanceType);
}
}