package org.jboss.resteasy.cdi;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.decorator.Decorator;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.event.Observes;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.BeforeBeanDiscovery;
import javax.enterprise.inject.spi.Extension;
import javax.enterprise.inject.spi.InjectionTarget;
import javax.enterprise.inject.spi.ProcessAnnotatedType;
import javax.enterprise.inject.spi.ProcessInjectionTarget;
import javax.enterprise.inject.spi.ProcessSessionBean;
import javax.enterprise.inject.spi.WithAnnotations;
import javax.enterprise.util.AnnotationLiteral;
import javax.ws.rs.Path;
import javax.ws.rs.core.Application;
import javax.ws.rs.ext.Provider;
import org.jboss.resteasy.cdi.i18n.LogMessages;
import org.jboss.resteasy.cdi.i18n.Messages;
import org.jboss.resteasy.util.GetRestful;
/**
* This Extension handles default scopes for discovered JAX-RS components. It
* also observes ProcessInjectionTarget event and wraps InjectionTargets
* representing JAX-RS components within JaxrsInjectionTarget. Furthermore, it
* builds the sessionBeanInterface map which maps Session Bean classes to a
* local interface. This map is used in CdiInjectorFactory during lookup of
* Sesion Bean JAX-RS components.
*
* @author Jozef Hartinger
*
*/
public class ResteasyCdiExtension implements Extension
{
private static boolean active;
private BeanManager beanManager;
private static final String JAVAX_EJB_STATELESS = "javax.ejb.Stateless";
private static final String JAVAX_EJB_SINGLETON = "javax.ejb.Singleton";
private final List<Class> providers = new ArrayList<Class>();
private final List<Class> resources = new ArrayList<Class>();
// Scope literals
public static final Annotation requestScopedLiteral = new AnnotationLiteral<RequestScoped>()
{
private static final long serialVersionUID = 3381824686081435817L;
};
public static final Annotation applicationScopedLiteral = new AnnotationLiteral<ApplicationScoped>()
{
private static final long serialVersionUID = -8211157243671012820L;
};
public static boolean isCDIActive()
{
return active;
}
private Map<Class<?>, Type> sessionBeanInterface = new HashMap<Class<?>, Type>();
/**
* Obtain BeanManager reference for future use.
*/
public void observeBeforeBeanDiscovery(@Observes BeforeBeanDiscovery event, BeanManager beanManager)
{
this.beanManager = beanManager;
active = true;
}
/**
* Set a default scope for each CDI bean which is a JAX-RS Resource.
*
* @param event
* @param beanManager
*/
public <T> void observeResources(@WithAnnotations({Path.class}) @Observes ProcessAnnotatedType<T> event, BeanManager beanManager)
{
setBeanManager(beanManager);
AnnotatedType<T> annotatedType = event.getAnnotatedType();
if(!annotatedType.getJavaClass().isInterface()
&& !isSessionBean(annotatedType)
// This check is redundant for CDI 1.1 containers but required for CDI 1.0
&& GetRestful.isRootResource(annotatedType.getJavaClass())
&& !annotatedType.isAnnotationPresent(Decorator.class))
{
LogMessages.LOGGER.debug(Messages.MESSAGES.discoveredCDIBeanJaxRsResource(annotatedType.getJavaClass().getCanonicalName()));
event.setAnnotatedType(wrapAnnotatedType(annotatedType, requestScopedLiteral));
this.resources.add(annotatedType.getJavaClass());
}
}
/**
* Set a default scope for each CDI bean which is a JAX-RS Provider.
*
* @param event
* @param beanManager
*/
public <T> void observeProviders(@WithAnnotations({Provider.class}) @Observes ProcessAnnotatedType<T> event, BeanManager beanManager)
{
setBeanManager(beanManager);
AnnotatedType<T> annotatedType = event.getAnnotatedType();
if(!annotatedType.getJavaClass().isInterface()
&& !isSessionBean(annotatedType)
// This check is redundant for CDI 1.1 containers but required for CDI 1.0
&& annotatedType.isAnnotationPresent(Provider.class))
{
LogMessages.LOGGER.debug(Messages.MESSAGES.discoveredCDIBeanJaxRsProvider(annotatedType.getJavaClass().getCanonicalName()));
event.setAnnotatedType(wrapAnnotatedType(annotatedType, applicationScopedLiteral));
this.providers.add(annotatedType.getJavaClass());
}
}
/**
* Set a default scope for each CDI bean which is a JAX-RS Application subclass.
*
* @param event
* @param beanManager
*/
public <T extends Application> void observeApplications(@Observes ProcessAnnotatedType<T> event, BeanManager beanManager)
{
setBeanManager(beanManager);
AnnotatedType<T> annotatedType = event.getAnnotatedType();
if(!isSessionBean(annotatedType))
{
LogMessages.LOGGER.debug(Messages.MESSAGES.discoveredCDIBeanApplication(annotatedType.getJavaClass().getCanonicalName()));
event.setAnnotatedType(wrapAnnotatedType(annotatedType, applicationScopedLiteral));
}
}
protected <T> AnnotatedType<T> wrapAnnotatedType(AnnotatedType<T> type, Annotation scope)
{
if (Utils.isScopeDefined(type, beanManager))
{
LogMessages.LOGGER.debug(Messages.MESSAGES.beanHasScopeDefined(type.getJavaClass()));
return type; // leave it as it is
}
else
{
LogMessages.LOGGER.debug(Messages.MESSAGES.beanDoesNotHaveScopeDefined(type.getJavaClass(), scope));
return new JaxrsAnnotatedType<T>(type, scope);
}
}
/**
* Wrap InjectionTarget of JAX-RS components within JaxrsInjectionTarget
* which takes care of JAX-RS property injection.
*/
public <T> void observeInjectionTarget(@Observes ProcessInjectionTarget<T> event)
{
if (event.getAnnotatedType() == null)
{ // check for resin's bug http://bugs.caucho.com/view.php?id=3967
LogMessages.LOGGER.warn(Messages.MESSAGES.annotatedTypeNull());
return;
}
if (Utils.isJaxrsComponent(event.getAnnotatedType().getJavaClass()))
{
event.setInjectionTarget(wrapInjectionTarget(event));
}
}
protected <T> InjectionTarget<T> wrapInjectionTarget(ProcessInjectionTarget<T> event)
{
return new JaxrsInjectionTarget<T>(event.getInjectionTarget(), event.getAnnotatedType().getJavaClass());
}
/**
* Observes ProcessSessionBean events and creates a (Bean class -> Local
* interface) map for Session beans with local interfaces. This map is
* necessary since RESTEasy identifies a bean class as JAX-RS components
* while CDI requires a local interface to be used for lookup.
*/
public <T> void observeSessionBeans(@Observes ProcessSessionBean<T> event)
{
Bean<Object> sessionBean = event.getBean();
if (Utils.isJaxrsComponent(sessionBean.getBeanClass()))
{
addSessionBeanInterface(sessionBean);
}
}
private void addSessionBeanInterface(Bean<?> bean)
{
for (Type type : bean.getTypes())
{
if ((type instanceof Class<?>) && ((Class<?>) type).isInterface())
{
Class<?> clazz = (Class<?>) type;
if (Utils.isJaxrsAnnotatedClass(clazz))
{
sessionBeanInterface.put(bean.getBeanClass(), type);
LogMessages.LOGGER.debug(Messages.MESSAGES.typeWillBeUsedForLookup(type, bean.getBeanClass()));
return;
}
}
}
LogMessages.LOGGER.debug(Messages.MESSAGES.noLookupInterface(bean.getBeanClass()));
}
public Map<Class<?>, Type> getSessionBeanInterface()
{
return sessionBeanInterface;
}
private boolean isSessionBean(AnnotatedType<?> annotatedType)
{
for (Annotation annotation : annotatedType.getAnnotations())
{
Class<?> annotationType = annotation.annotationType();
if (annotationType.getName().equals(JAVAX_EJB_STATELESS) || annotationType.getName().equals(JAVAX_EJB_SINGLETON))
{
LogMessages.LOGGER.debug(Messages.MESSAGES.beanIsSLSBOrSingleton(annotatedType.getJavaClass()));
return true; // Do not modify scopes of SLSBs and Singletons
}
}
return false;
}
private void setBeanManager(BeanManager beanManager)
{
if (this.beanManager == null) {
// this may happen if Solder Config receives BBD first
this.beanManager = beanManager;
}
}
public List<Class> getProviders()
{
return providers;
}
public List<Class> getResources()
{
return resources;
}
}