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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.bytecode.internal.bytebuddy;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.hibernate.AssertionFailure;
import org.hibernate.HibernateException;
import org.hibernate.bytecode.spi.BasicProxyFactory;
import org.hibernate.proxy.ProxyConfiguration;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.description.modifier.Visibility;
import net.bytebuddy.dynamic.scaffold.TypeValidation;
import net.bytebuddy.implementation.FieldAccessor;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.implementation.auxiliary.AuxiliaryType;
import net.bytebuddy.implementation.bytecode.assign.Assigner;
import net.bytebuddy.matcher.ElementMatchers;
public class BasicProxyFactoryImpl implements BasicProxyFactory {
private static final ConcurrentMap, Class> CACHE = new ConcurrentHashMap, Class>();
private static final Class[] NO_INTERFACES = new Class[0];
private final Class proxyClass;
public BasicProxyFactoryImpl(Class superClass, Class[] interfaces) {
if ( superClass == null && ( interfaces == null || interfaces.length < 1 ) ) {
throw new AssertionFailure( "attempting to build proxy without any superclass or interfaces" );
}
Set key = new HashSet();
if ( superClass != null ) {
key.add( superClass );
}
if ( interfaces != null && interfaces.length > 0 ) {
key.addAll( Arrays.asList( interfaces ) );
}
Class proxyClass = CACHE.get( key );
if ( proxyClass == null ) {
proxyClass = new ByteBuddy()
.with( TypeValidation.DISABLED )
.with( new AuxiliaryType.NamingStrategy.SuffixingRandom( "HibernateBasicProxy" ) )
.subclass( superClass == null ? Object.class : superClass )
.implement( interfaces == null ? NO_INTERFACES : interfaces )
.defineField( ProxyConfiguration.INTERCEPTOR_FIELD_NAME, ProxyConfiguration.Interceptor.class, Visibility.PRIVATE )
.method( ElementMatchers.isVirtual().and( ElementMatchers.not( ElementMatchers.isFinalizer() ) ) )
.intercept( MethodDelegation.toField( ProxyConfiguration.INTERCEPTOR_FIELD_NAME ) )
.implement( ProxyConfiguration.class )
.intercept( FieldAccessor.ofField( ProxyConfiguration.INTERCEPTOR_FIELD_NAME ).withAssigner( Assigner.DEFAULT, Assigner.Typing.DYNAMIC ) )
.make()
.load( BasicProxyFactory.class.getClassLoader() )
.getLoaded();
Class previousProxy = CACHE.putIfAbsent( key, proxyClass );
if ( previousProxy != null ) {
proxyClass = previousProxy;
}
}
this.proxyClass = proxyClass;
}
public Object getProxy() {
try {
final ProxyConfiguration proxy = (ProxyConfiguration) proxyClass.newInstance();
proxy.$$_hibernate_set_interceptor( new PassThroughInterceptor( proxy, proxyClass.getName() ) );
return proxy;
}
catch (Throwable t) {
throw new HibernateException( "Unable to instantiate proxy instance" );
}
}
public boolean isInstance(Object object) {
return proxyClass.isInstance( object );
}
}