/**
* GRANITE DATA SERVICES
* Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
*
* This file is part of the Granite Data Services Platform.
*
* Granite Data Services is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Granite Data Services is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA, or see <http://www.gnu.org/licenses/>.
*/
package org.granite.hibernate.jmf;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import javax.persistence.Entity;
import javax.persistence.MappedSuperclass;
import org.granite.logging.Logger;
import org.granite.messaging.jmf.ExtendedObjectInput;
import org.granite.messaging.jmf.ExtendedObjectOutput;
import org.granite.messaging.jmf.codec.ExtendedObjectCodec;
import org.granite.messaging.reflect.Property;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.LazyInitializer;
/**
* @author Franck WOLFF
*/
public class EntityCodec implements ExtendedObjectCodec {
private static final Logger log = Logger.getLogger(EntityCodec.class);
private final ConcurrentMap<Class<?>, SerializableProxyAdapter> serializableProxyAdapters = new ConcurrentHashMap<Class<?>, SerializableProxyAdapter>();
static class SerializableProxyAdapter {
private final Object serializableProxy;
private final Field idField;
private final Method readResolveMethod;
public SerializableProxyAdapter(HibernateProxy proxy) throws NoSuchMethodException, SecurityException, NoSuchFieldException {
this.serializableProxy = proxy.writeReplace();
this.idField = serializableProxy.getClass().getDeclaredField("id");
this.idField.setAccessible(true);
this.readResolveMethod = serializableProxy.getClass().getDeclaredMethod("readResolve");
this.readResolveMethod.setAccessible(true);
}
public HibernateProxy newProxy(Serializable id) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
synchronized (serializableProxy) {
idField.set(serializableProxy, id);
return (HibernateProxy)readResolveMethod.invoke(serializableProxy);
}
}
}
public boolean canEncode(ExtendedObjectOutput out, Object v) {
Class<?> cls = getClass(out, v);
return (cls.isAnnotationPresent(Entity.class) || cls.isAnnotationPresent(MappedSuperclass.class));
}
public String getEncodedClassName(ExtendedObjectOutput out, Object v) {
return getClass(out, v).getName();
}
public void encode(ExtendedObjectOutput out, Object v) throws IOException, IllegalAccessException, InvocationTargetException {
String detachedState = null;
if (v instanceof HibernateProxy) {
HibernateProxy proxy = (HibernateProxy)v;
// Only write initialized flag, detachedState & id if v is an uninitialized proxy.
if (proxy.getHibernateLazyInitializer().isUninitialized()) {
Class<?> persistentClass = proxy.getHibernateLazyInitializer().getPersistentClass();
if (!serializableProxyAdapters.containsKey(persistentClass)) {
try {
SerializableProxyAdapter proxyAdapter = new SerializableProxyAdapter(proxy);
serializableProxyAdapters.putIfAbsent(persistentClass, proxyAdapter);
}
catch (Exception e) {
throw new IOException("Could not create SerializableProxyAdapter for: " + proxy);
}
}
Serializable id = proxy.getHibernateLazyInitializer().getIdentifier();
log.debug("Writing uninitialized HibernateProxy %s with id %s", detachedState, id);
out.writeBoolean(false);
out.writeUTF(null);
out.writeObject(id);
return;
}
// Proxy is initialized, get the underlying persistent object.
log.debug("Writing initialized HibernateProxy...");
v = proxy.getHibernateLazyInitializer().getImplementation();
}
// Write initialized flag & detachedState.
out.writeBoolean(true);
out.writeUTF(null);
// Write all properties in lexical order.
List<Property> properties = out.getReflection().findSerializableProperties(v.getClass());
for (Property property : properties)
out.getAndWriteProperty(v, property);
}
public boolean canDecode(ExtendedObjectInput in, String className) throws ClassNotFoundException {
Class<?> cls = in.getReflection().loadClass(className);
return (cls.isAnnotationPresent(Entity.class) || cls.isAnnotationPresent(MappedSuperclass.class));
}
public String getDecodedClassName(ExtendedObjectInput in, String className) {
return in.getAlias(className);
}
public Object newInstance(ExtendedObjectInput in, String className)
throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException,
InvocationTargetException, SecurityException, NoSuchMethodException, IOException {
Class<?> cls = in.getReflection().loadClass(className);
// Read initialized flag & detachedState.
boolean initialized = in.readBoolean();
in.readUTF();
if (initialized)
return in.getReflection().newInstance(cls);
// Create an HibernateProxy.
SerializableProxyAdapter proxyAdapter = serializableProxyAdapters.get(cls);
if (proxyAdapter == null)
throw new IOException("Could not find SerializableProxyAdapter for: " + cls);
Serializable id = (Serializable)in.readObject();
return proxyAdapter.newProxy(id);
}
public void decode(ExtendedObjectInput in, Object v) throws IOException, ClassNotFoundException, IllegalAccessException, InvocationTargetException {
if (!(v instanceof HibernateProxy)) {
List<Property> properties = in.getReflection().findSerializableProperties(v.getClass());
for (Property property : properties)
in.readAndSetProperty(v, property);
}
}
protected Class<?> getClass(ExtendedObjectOutput out, Object v) {
Class<?> cls = v.getClass();
if (v instanceof HibernateProxy) {
LazyInitializer initializer = ((HibernateProxy)v).getHibernateLazyInitializer();
String className = (
initializer.isUninitialized() ?
initializer.getEntityName() :
initializer.getImplementation().getClass().getName()
);
if (className != null && className.length() > 0) {
try {
cls = out.getReflection().loadClass(className);
} catch (ClassNotFoundException e) {
cls = initializer.getPersistentClass();
}
}
}
return cls;
}
}