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package com.sun.enterprise.util;
import java.io.Serializable;
import java.util.logging.*;
import java.util.Set;
import java.util.Map;
import javax.naming.Reference;
import javax.persistence.*;
import com.sun.enterprise.deployment.types.EntityManagerFactoryReference;
import com.sun.enterprise.deployment.EjbDescriptor;
import com.sun.enterprise.deployment.WebBundleDescriptor;
import com.sun.enterprise.deployment.ApplicationClientDescriptor;
import com.sun.enterprise.deployment.BundleDescriptor;
import com.sun.enterprise.deployment.Application;
import com.sun.enterprise.InvocationManager;
import com.sun.enterprise.Switch;
import com.sun.enterprise.ComponentInvocation;
import com.sun.logging.*;
/**
* Wrapper for application references to entity manager factories.
* A new instance of this class will be created for each injected
* EntityManagerFactory reference or each lookup of an EntityManagerFactory
* reference within the component jndi environment.
*
* @author Kenneth Saks
*/
public class EntityManagerFactoryWrapper implements EntityManagerFactory,
Serializable {
static Logger _logger=LogDomains.getLogger(LogDomains.UTIL_LOGGER);
static private LocalStringManagerImpl localStrings =
new LocalStringManagerImpl(EntityManagerFactoryWrapper.class);
private String unitName;
transient private EntityManagerFactory entityManagerFactory;
public EntityManagerFactoryWrapper(EntityManagerFactoryReference
referenceDescriptor) {
unitName = referenceDescriptor.getUnitName();
}
private EntityManagerFactory getDelegate() {
if( entityManagerFactory == null ) {
entityManagerFactory = lookupEntityManagerFactory(unitName);
if( entityManagerFactory == null ) {
throw new IllegalStateException
("Unable to retrieve EntityManagerFactory for unitName "
+ unitName);
}
}
return entityManagerFactory;
}
public EntityManager createEntityManager() {
return getDelegate().createEntityManager();
}
public EntityManager createEntityManager(Map map) {
return getDelegate().createEntityManager(map);
}
public void close() {
getDelegate().close();
}
public boolean isOpen() {
return getDelegate().isOpen();
}
/**
* Lookup physical EntityManagerFactory based on current component
* invocation.
* @param emfUnitName unit name of entity manager factory or null if not
* specified.
* @return EntityManagerFactory or null if no matching factory could be
* found.
**/
static EntityManagerFactory lookupEntityManagerFactory(String emfUnitName)
{
InvocationManager invMgr = Switch.getSwitch().getInvocationManager();
ComponentInvocation inv = invMgr.getCurrentInvocation();
EntityManagerFactory emf = null;
if( inv != null ) {
Object descriptor =
Switch.getSwitch().getDescriptorFor(inv.getContainerContext());
emf = lookupEntityManagerFactory(inv.getInvocationType(),
emfUnitName, descriptor);
}
return emf;
}
public static EntityManagerFactory lookupEntityManagerFactory(int invType,
String emfUnitName, Object descriptor) {
Application app = null;
BundleDescriptor module = null;
EntityManagerFactory emf = null;
switch (invType) {
case ComponentInvocation.EJB_INVOCATION:
EjbDescriptor ejbDesc = (EjbDescriptor) descriptor;
module = ejbDesc.getEjbBundleDescriptor();
app = module.getApplication();
break;
case ComponentInvocation.SERVLET_INVOCATION:
module = (WebBundleDescriptor) descriptor;
app = module.getApplication();
break;
case ComponentInvocation.APP_CLIENT_INVOCATION:
module = (ApplicationClientDescriptor) descriptor;
app = module.getApplication();
break;
default:
break;
}
// First check module-level for a match.
if (module != null) {
if (emfUnitName != null) {
emf = module.getEntityManagerFactory(emfUnitName);
} else {
Set<EntityManagerFactory> emFactories = module
.getEntityManagerFactories();
if (emFactories.size() == 1) {
emf = emFactories.iterator().next();
}
}
}
// If we're in an .ear and no module-level persistence unit was
// found, check for an application-level match.
if ((app != null) && (emf == null)) {
if (emfUnitName != null) {
emf = app.getEntityManagerFactory(emfUnitName, module);
} else {
Set<EntityManagerFactory> emFactories = app
.getEntityManagerFactories();
if (emFactories.size() == 1) {
emf = emFactories.iterator().next();
}
}
}
return emf;
}
}
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