package org.hibernate.proxy.pojo.bytebuddy;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;
import org.hibernate.HibernateException;
import org.hibernate.bytecode.internal.bytebuddy.ByteBuddyState;
import org.hibernate.cfg.Environment;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.internal.util.collections.ArrayHelper;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.ProxyConfiguration;
import org.hibernate.proxy.ProxyFactory;
import org.hibernate.type.CompositeType;
import net.bytebuddy.NamingStrategy;
import net.bytebuddy.TypeCache;
import net.bytebuddy.description.modifier.Visibility;
import net.bytebuddy.dynamic.scaffold.subclass.ConstructorStrategy;
import net.bytebuddy.implementation.FieldAccessor;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.implementation.SuperMethodCall;
import net.bytebuddy.implementation.bytecode.assign.Assigner;
import static net.bytebuddy.matcher.ElementMatchers.isFinalizer;
import static net.bytebuddy.matcher.ElementMatchers.isSynthetic;
import static net.bytebuddy.matcher.ElementMatchers.isVirtual;
import static net.bytebuddy.matcher.ElementMatchers.nameStartsWith;
import static net.bytebuddy.matcher.ElementMatchers.named;
import static net.bytebuddy.matcher.ElementMatchers.not;
import static net.bytebuddy.matcher.ElementMatchers.returns;
import static org.hibernate.internal.CoreLogging.messageLogger;
public class ByteBuddyProxyFactory implements ProxyFactory, Serializable {
private static final CoreMessageLogger LOG = messageLogger( ByteBuddyProxyFactory.class );
private static final String PROXY_NAMING_SUFFIX = Environment.useLegacyProxyClassnames() ? "HibernateProxy$" : "HibernateProxy";
private Class persistentClass;
private String entityName;
private Class[] interfaces;
private Method getIdentifierMethod;
private Method setIdentifierMethod;
private CompositeType componentIdType;
private boolean overridesEquals;
private Class proxyClass;
@Override
public void postInstantiate(
String entityName,
Class persistentClass,
Set<Class> interfaces,
Method getIdentifierMethod,
Method setIdentifierMethod,
CompositeType componentIdType) throws HibernateException {
this.entityName = entityName;
this.persistentClass = persistentClass;
this.interfaces = toArray( interfaces );
this.getIdentifierMethod = getIdentifierMethod;
this.setIdentifierMethod = setIdentifierMethod;
this.componentIdType = componentIdType;
this.overridesEquals = ReflectHelper.overridesEquals( persistentClass );
this.proxyClass = buildProxy( persistentClass, this.interfaces );
}
private Class[] toArray(Set<Class> interfaces) {
if ( interfaces == null ) {
return ArrayHelper.EMPTY_CLASS_ARRAY;
}
return interfaces.toArray( new Class[interfaces.size()] );
}
public static Class buildProxy(
final Class persistentClass,
final Class[] interfaces) {
Set<Class<?>> key = new HashSet<Class<?>>();
if ( interfaces.length == 1 ) {
key.add( persistentClass );
}
key.addAll( Arrays.<Class<?>>asList( interfaces ) );
final TypeCache<TypeCache.SimpleKey> cacheForProxies = ByteBuddyState.getCacheForProxies();
return cacheForProxies.findOrInsert( persistentClass.getClassLoader(), new TypeCache.SimpleKey(key), () ->
ByteBuddyState.getStaticByteBuddyInstance()
.ignore( isSynthetic().and( named( "getMetaClass" ).and( returns( td -> "groovy.lang.MetaClass".equals( td.getName() ) ) ) ) )
.with( new NamingStrategy.SuffixingRandom( PROXY_NAMING_SUFFIX, new NamingStrategy.SuffixingRandom.BaseNameResolver.ForFixedValue( persistentClass.getName() ) ) )
.subclass( interfaces.length == 1 ? persistentClass : Object.class, ConstructorStrategy.Default.IMITATE_SUPER_CLASS_OPENING )
.implement( (Type[]) interfaces )
.method( isVirtual().and( not( isFinalizer() ) ) )
.intercept( MethodDelegation.to( ProxyConfiguration.InterceptorDispatcher.class ) )
.method( nameStartsWith( "$$_hibernate_" ).and( isVirtual() ) )
.intercept( SuperMethodCall.INSTANCE )
.defineField( ProxyConfiguration.INTERCEPTOR_FIELD_NAME, ProxyConfiguration.Interceptor.class, Visibility.PRIVATE )
.implement( ProxyConfiguration.class )
.intercept( FieldAccessor.ofField( ProxyConfiguration.INTERCEPTOR_FIELD_NAME ).withAssigner( Assigner.DEFAULT, Assigner.Typing.DYNAMIC ) )
.make()
.load( persistentClass.getClassLoader(), ByteBuddyState.resolveClassLoadingStrategy( persistentClass ) )
.getLoaded(), cacheForProxies );
}
@Override
public HibernateProxy getProxy(
Serializable id,
SharedSessionContractImplementor session) throws HibernateException {
final ByteBuddyInterceptor interceptor = new ByteBuddyInterceptor(
entityName,
persistentClass,
interfaces,
id,
getIdentifierMethod,
setIdentifierMethod,
componentIdType,
session,
overridesEquals
);
try {
final HibernateProxy proxy = (HibernateProxy) proxyClass.newInstance();
( (ProxyConfiguration) proxy ).$$_hibernate_set_interceptor( interceptor );
return proxy;
}
catch (Throwable t) {
LOG.error( LOG.bytecodeEnhancementFailed( entityName ), t );
throw new HibernateException( LOG.bytecodeEnhancementFailed( entityName ), t );
}
}
public static HibernateProxy deserializeProxy(SerializableProxy serializableProxy) {
final ByteBuddyInterceptor interceptor = new ByteBuddyInterceptor(
serializableProxy.getEntityName(),
serializableProxy.getPersistentClass(),
serializableProxy.getInterfaces(),
serializableProxy.getId(),
resolveIdGetterMethod( serializableProxy ),
resolveIdSetterMethod( serializableProxy ),
serializableProxy.getComponentIdType(),
null,
ReflectHelper.overridesEquals( serializableProxy.getPersistentClass() )
);
try {
final Class proxyClass = buildProxy(
serializableProxy.getPersistentClass(),
serializableProxy.getInterfaces()
);
final HibernateProxy proxy = (HibernateProxy) proxyClass.newInstance();
( (ProxyConfiguration) proxy ).$$_hibernate_set_interceptor( interceptor );
return proxy;
}
catch (Throwable t) {
final String message = LOG.bytecodeEnhancementFailed( serializableProxy.getEntityName() );
LOG.error( message, t );
throw new HibernateException( message, t );
}
}
@SuppressWarnings("unchecked")
private static Method resolveIdGetterMethod(SerializableProxy serializableProxy) {
if ( serializableProxy.getIdentifierGetterMethodName() == null ) {
return null;
}
try {
return serializableProxy.getIdentifierGetterMethodClass().getDeclaredMethod( serializableProxy.getIdentifierGetterMethodName() );
}
catch (NoSuchMethodException e) {
throw new HibernateException(
String.format(
Locale.ENGLISH,
"Unable to deserialize proxy [%s, %s]; could not locate id getter method [%s] on entity class [%s]",
serializableProxy.getEntityName(),
serializableProxy.getId(),
serializableProxy.getIdentifierGetterMethodName(),
serializableProxy.getIdentifierGetterMethodClass()
)
);
}
}
@SuppressWarnings("unchecked")
private static Method resolveIdSetterMethod(SerializableProxy serializableProxy) {
if ( serializableProxy.getIdentifierSetterMethodName() == null ) {
return null;
}
try {
return serializableProxy.getIdentifierSetterMethodClass().getDeclaredMethod(
serializableProxy.getIdentifierSetterMethodName(),
serializableProxy.getIdentifierSetterMethodParams()
);
}
catch (NoSuchMethodException e) {
throw new HibernateException(
String.format(
Locale.ENGLISH,
"Unable to deserialize proxy [%s, %s]; could not locate id setter method [%s] on entity class [%s]",
serializableProxy.getEntityName(),
serializableProxy.getId(),
serializableProxy.getIdentifierSetterMethodName(),
serializableProxy.getIdentifierSetterMethodClass()
)
);
}
}
}