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/*
* 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.tuscany.service.persistence.common;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.net.URI;
import java.util.Properties;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.PersistenceProperty;
import javax.transaction.TransactionManager;
import org.osoa.sca.annotations.Reference;
import org.apache.tuscany.spi.ObjectFactory;
import org.apache.tuscany.spi.component.RegistrationException;
import org.apache.tuscany.spi.deployer.DeploymentContext;
import org.apache.tuscany.spi.idl.InvalidServiceContractException;
import org.apache.tuscany.spi.idl.java.InterfaceJavaIntrospector;
import org.apache.tuscany.spi.implementation.java.AbstractPropertyProcessor;
import org.apache.tuscany.spi.implementation.java.ImplementationProcessorService;
import org.apache.tuscany.spi.implementation.java.JavaMappedProperty;
import org.apache.tuscany.spi.implementation.java.ProcessingException;
import org.apache.tuscany.spi.model.ServiceContract;
import org.apache.tuscany.core.component.ComponentManager;
/**
* Annotation processor for injecting <code>PersistenceUnit</code> annotations on properties.
*
* @version $Rev$ $Date$
*/
public class PersistenceContextProcessor extends AbstractPropertyProcessor<PersistenceContext> {
/**
* Transaction Manager
*/
private TransactionManager transactionManager;
private ComponentManager componentManager;
private InterfaceJavaIntrospector introspector;
/**
* Persistence unit builder
*/
private PersistenceUnitBuilder builder = new DefaultPersistenceUnitBuilder();
/**
* Injects the implementation processor service.
*
* @param service Implementation processor service.
*/
public PersistenceContextProcessor(@Reference ImplementationProcessorService service) {
super(PersistenceContext.class, service);
}
@Reference
public void setTransactionManager(TransactionManager transactionManager) {
this.transactionManager = transactionManager;
}
@Reference
public void setComponentManager(ComponentManager componentManager) {
this.componentManager = componentManager;
}
@Reference
public void setIntrospector(InterfaceJavaIntrospector introspector) {
this.introspector = introspector;
}
/**
* Defaults to the field name.
*/
@Override
protected String getName(PersistenceContext persistenceContext) {
return null;
}
/**
* Initializes the property.
*/
@SuppressWarnings("unchecked")
protected <T> void initProperty(JavaMappedProperty<T> property,
PersistenceContext annotation,
DeploymentContext context) throws ProcessingException {
String unitName = annotation.unitName();
URI unitUri = context.getComponentId().resolve(unitName);
EntityManagerFactory emf = (EntityManagerFactory) componentManager.getComponent(unitUri);
if (emf == null) {
emf = builder.newEntityManagerFactory(unitName, context.getClassLoader());
try {
ServiceContract<EntityManagerFactory> contract =
(ServiceContract) introspector.introspect(EntityManagerFactory.class);
componentManager.registerJavaObject(unitUri, contract, emf);
} catch (RegistrationException e) {
throw new ProcessingException(e);
} catch (InvalidServiceContractException e) {
throw new ProcessingException(e);
}
}
ObjectFactory factory = new EmObjectFactory(emf, annotation);
property.setDefaultValueFactory(factory);
}
private class EmObjectFactory implements ObjectFactory<EntityManager> {
private EntityManagerFactory emf;
private PersistenceContext annotation;
public EmObjectFactory(EntityManagerFactory emf, PersistenceContext annotation) {
this.emf = emf;
this.annotation = annotation;
}
public EntityManager getInstance() {
PersistenceContextType type = annotation.type();
if (type == PersistenceContextType.TRANSACTION) {
Properties props = new Properties();
for (PersistenceProperty property : annotation.properties()) {
props.put(property.name(), property.value());
}
Class[] interfaces = new Class[]{EntityManager.class};
InvocationHandler handler = new EntityManagerProxy(props, emf, transactionManager);
EntityManager em =
(EntityManager) Proxy.newProxyInstance(getClass().getClassLoader(), interfaces, handler);
return em;
} else {
throw new UnsupportedOperationException("Extended persistence contexts not supported");
}
}
}
}
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