/*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* 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.kie.spring.persistence;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import org.kie.api.runtime.Environment;
import org.kie.api.runtime.EnvironmentName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.orm.jpa.EntityManagerHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;
public abstract class AbstractKieSpringJpaManager
{
Logger logger = LoggerFactory.getLogger(getClass());
protected Environment env;
protected EntityManagerFactory emf;
protected EntityManager appScopedEntityManager;
protected boolean internalAppScopedEntityManager;
protected boolean isJTA;
public AbstractKieSpringJpaManager(Environment env) {
this.env = env;
this.emf = (EntityManagerFactory) env.get(EnvironmentName.ENTITY_MANAGER_FACTORY);
isJTA = true;
Boolean bool = (Boolean) env.get("IS_JTA_TRANSACTION");
if (bool != null) {
isJTA = bool.booleanValue();
}
}
public EntityManager getApplicationScopedEntityManager() {
if (this.appScopedEntityManager == null) {
// Use the App scoped EntityManager if the user has provided it, and it is open.
this.appScopedEntityManager = (EntityManager) this.env.get(EnvironmentName.APP_SCOPED_ENTITY_MANAGER);
if (this.appScopedEntityManager != null && !this.appScopedEntityManager.isOpen()) {
throw new RuntimeException("Provided APP_SCOPED_ENTITY_MANAGER is not open");
}
if (this.appScopedEntityManager == null) {
EntityManagerHolder emHolder = (EntityManagerHolder) TransactionSynchronizationManager.getResource(this.emf);
if (emHolder == null) {
this.appScopedEntityManager = this.emf.createEntityManager();
emHolder = new EntityManagerHolder(this.appScopedEntityManager);
TransactionSynchronizationManager.bindResource(this.emf, emHolder);
internalAppScopedEntityManager = true;
} else {
this.appScopedEntityManager = emHolder.getEntityManager();
}
this.env.set(EnvironmentName.APP_SCOPED_ENTITY_MANAGER,
emHolder.getEntityManager());
}
}
if (TransactionSynchronizationManager.isActualTransactionActive() && isJTA) {
this.appScopedEntityManager.joinTransaction();
}
return this.appScopedEntityManager;
}
public EntityManager getCommandScopedEntityManager() {
EntityManager cmdScopedEntityManager = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
if (cmdScopedEntityManager == null || !cmdScopedEntityManager.isOpen()) {
EntityManagerHolder emHolder = (EntityManagerHolder) TransactionSynchronizationManager.getResource("cmdEM");
EntityManager em = null;
if (emHolder == null) {
em = this.emf.createEntityManager();
emHolder = new EntityManagerHolder(em);
TransactionSynchronizationManager.bindResource("cmdEM", emHolder);
} else {
em = emHolder.getEntityManager();
}
cmdScopedEntityManager = em;
this.env.set(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER, Proxy.newProxyInstance(this.getClass().getClassLoader(),
new Class[]{EntityManager.class}, new EmHolderDelegateInvocationHandler()));
}
return cmdScopedEntityManager;
}
public abstract void endCommandScopedEntityManager();
public void dispose() {
logger.trace("Disposing KieSpringJpaManager");
if (internalAppScopedEntityManager) {
//TransactionSynchronizationManager.unbindResource( "appEM" );
TransactionSynchronizationManager.unbindResource(this.emf);
if (this.appScopedEntityManager != null && this.appScopedEntityManager.isOpen()) {
this.appScopedEntityManager.close();
this.internalAppScopedEntityManager = false;
this.env.set(EnvironmentName.APP_SCOPED_ENTITY_MANAGER,
null);
this.appScopedEntityManager = null;
}
this.endCommandScopedEntityManager();
} else {
logger.debug("Not cleaning application scoped manager em holder = {} em = {}", TransactionSynchronizationManager.getResource(this.emf), this.env.get(EnvironmentName.APP_SCOPED_ENTITY_MANAGER));
}
}
/**
* Invocation handler to allow proper (thread safe) usage of Spring entity managers
* that are taken from EntityManagerHolder which binds em instances to a thread.
* It is required as entity manager is stored in Environment that can be accessed by multiple
* threads working on same ksession so to mitigate that proxy with this handler is placed in environment
* instead of actual entity manager instance
*/
private class EmHolderDelegateInvocationHandler implements InvocationHandler {
@Override
public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
EntityManagerHolder delegate = (EntityManagerHolder)TransactionSynchronizationManager.getResource("cmdEM");
if (delegate == null && method.getName().equals("isOpen")) {
return false;
}
try {
return method.invoke(delegate.getEntityManager(), objects);
} catch (Throwable e) {
if (e.getCause() != null) {
throw e.getCause();
}
throw e;
}
}
}
}