/*
* 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.sirona.jpa;
import org.apache.sirona.Role;
import org.apache.sirona.configuration.Configuration;
import org.apache.sirona.counters.Unit;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceProvider;
import javax.persistence.spi.PersistenceUnitInfo;
import javax.persistence.spi.ProviderUtil;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Map;
import static org.apache.sirona.jpa.JPAProxyFactory.monitor;
public class SironaPersistence implements PersistenceProvider {
public static final Role ROLE = new Role("jpa", Unit.Time.NANOSECOND);
private static final String DELEGATE_PROVIDER_KEY = Configuration.CONFIG_PROPERTY_PREFIX + "jpa.provider";
private static final String DEFAULT_PROVIDER = System.getProperty(DELEGATE_PROVIDER_KEY);
private static final Class<?>[] PROXY_API = new Class<?>[] { EntityManagerFactory.class, Serializable.class};
private static final String[] PROVIDERS = {
"org.apache.openjpa.persistence.PersistenceProviderImpl",
"org.hibernate.jpa.HibernatePersistenceProvider",
"org.hibernate.ejb.HibernatePersistence",
"org.eclipse.persistence.jpa.PersistenceProvider",
"oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider",
"oracle.toplink.essentials.PersistenceProvider",
"me.prettyprint.hom.CassandraPersistenceProvider",
"org.datanucleus.jpa.PersistenceProviderImpl",
"com.orientechnologies.orient.core.db.object.jpa.OJPAPersistenceProvider",
"com.orientechnologies.orient.object.jpa.OJPAPersistenceProvider",
"com.spaceprogram.simplejpa.PersistenceProviderImpl"
};
private volatile PersistenceProvider delegate;
@Override
public EntityManagerFactory createEntityManagerFactory(final String unit, final Map map) {
final PersistenceProvider persistenceProvider = findDelegate(map);
final ClassLoader tccl = tccl();
final ClassLoader hack = new OverridePersistenceXmlClassLoader(tccl, persistenceProvider.getClass().getName());
Thread.currentThread().setContextClassLoader(hack);
try {
final EntityManagerFactory entityManagerFactory = persistenceProvider.createEntityManagerFactory(unit, map);
if (entityManagerFactory == null) {
return null;
}
return EntityManagerFactory.class.cast(
monitor(PROXY_API, entityManagerFactory, ROLE, true));
} finally {
Thread.currentThread().setContextClassLoader(tccl);
}
}
@Override
public EntityManagerFactory createContainerEntityManagerFactory(final PersistenceUnitInfo info, final Map map) {
final PersistenceProvider persistenceProvider = findDelegate(map);
final EntityManagerFactory containerEntityManagerFactory = persistenceProvider.createContainerEntityManagerFactory(
PersistenceUnitInfo.class.cast(Proxy.newProxyInstance(tccl(), new Class<?>[]{PersistenceUnitInfo.class}, new ProviderAwareHandler(persistenceProvider.getClass().getName(), info))),
map);
if (containerEntityManagerFactory == null) {
return null;
}
return EntityManagerFactory.class.cast(
monitor(PROXY_API, containerEntityManagerFactory, ROLE, true));
}
@Override
public ProviderUtil getProviderUtil() { // we suppose it is loaded later than createXXXEMF so we'll get the delegate
return loadOrGuessDelegate(null).getProviderUtil();
}
private PersistenceProvider findDelegate(final Map map) {
if (map == null) {
return loadOrGuessDelegate(null);
}
return loadOrGuessDelegate(String.class.cast(map.get(DELEGATE_PROVIDER_KEY)));
}
private PersistenceProvider loadOrGuessDelegate(final String name) {
if (delegate == null) {
synchronized (this) {
if (delegate == null) {
if (name == null) {
if (DEFAULT_PROVIDER != null) {
try {
delegate = newPersistence(DEFAULT_PROVIDER);
} catch (final Exception e) {
throw new IllegalStateException(new ClassNotFoundException("Can't instantiate '" + DEFAULT_PROVIDER + "'"));
}
} else {
for (final String provider : PROVIDERS) {
try {
delegate = newPersistence(provider);
if (delegate != null) {
break;
}
} catch (final Throwable th2) {
// no-op
}
}
}
if (delegate == null) {
throw new IllegalStateException(new ClassNotFoundException("Can't find a delegate"));
}
} else {
try {
delegate = newPersistence(name);
} catch (final Exception e) {
throw new IllegalStateException(new ClassNotFoundException("Can't instantiate '" + name + "'"));
}
}
}
}
}
if (name != null && !delegate.getClass().getName().equals(name)) {
try {
return newPersistence(name);
} catch (final Exception e) {
throw new IllegalStateException(new ClassNotFoundException("Can't instantiate '" + name + "'"));
}
}
return delegate;
}
private static ClassLoader tccl() {
return Thread.currentThread().getContextClassLoader();
}
private static PersistenceProvider newPersistence(final String name) throws Exception {
return PersistenceProvider.class.cast(tccl().loadClass(name).newInstance());
}
private static class ProviderAwareHandler implements InvocationHandler {
private final String provider;
private final PersistenceUnitInfo info;
public ProviderAwareHandler(final String provider, final PersistenceUnitInfo info) {
this.provider = provider;
this.info = info;
}
@Override
public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
if ("getPersistenceProviderClassName".equals(method.getName())) {
return provider;
}
return method.invoke(info, args);
}
}
}