CglibProxyFactory.java
/*
* Copyright 2009-2023 the original author or authors.
*
* 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
*
* https://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.ibatis.executor.loader.cglib;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
import java.util.Set;
import net.sf.cglib.proxy.Callback;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import org.apache.ibatis.executor.loader.AbstractEnhancedDeserializationProxy;
import org.apache.ibatis.executor.loader.AbstractSerialStateHolder;
import org.apache.ibatis.executor.loader.ProxyFactory;
import org.apache.ibatis.executor.loader.ResultLoaderMap;
import org.apache.ibatis.executor.loader.WriteReplaceInterface;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.reflection.ExceptionUtil;
import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.reflection.property.PropertyCopier;
import org.apache.ibatis.reflection.property.PropertyNamer;
import org.apache.ibatis.session.Configuration;
/**
* @author Clinton Begin
*
* @deprecated Since 3.5.10, use Javassist instead.
*/
@Deprecated
public class CglibProxyFactory implements ProxyFactory {
private static final String FINALIZE_METHOD = "finalize";
private static final String WRITE_REPLACE_METHOD = "writeReplace";
public CglibProxyFactory() {
try {
Resources.classForName("net.sf.cglib.proxy.Enhancer");
} catch (Throwable e) {
throw new IllegalStateException(
"Cannot enable lazy loading because CGLIB is not available. Add CGLIB to your classpath.", e);
}
}
@Override
public Object createProxy(Object target, ResultLoaderMap lazyLoader, Configuration configuration,
ObjectFactory objectFactory, List<Class<?>> constructorArgTypes, List<Object> constructorArgs) {
return EnhancedResultObjectProxyImpl.createProxy(target, lazyLoader, configuration, objectFactory,
constructorArgTypes, constructorArgs);
}
public Object createDeserializationProxy(Object target, Map<String, ResultLoaderMap.LoadPair> unloadedProperties,
ObjectFactory objectFactory, List<Class<?>> constructorArgTypes, List<Object> constructorArgs) {
return EnhancedDeserializationProxyImpl.createProxy(target, unloadedProperties, objectFactory, constructorArgTypes,
constructorArgs);
}
static Object createStaticProxy(Class<?> type, Callback callback, List<Class<?>> constructorArgTypes,
List<Object> constructorArgs) {
LogHolder.log.warn("CglibProxyFactory is deprecated. Use another proxy factory implementation.");
Enhancer enhancer = new Enhancer();
enhancer.setCallback(callback);
enhancer.setSuperclass(type);
try {
type.getDeclaredMethod(WRITE_REPLACE_METHOD);
// ObjectOutputStream will call writeReplace of objects returned by writeReplace
if (LogHolder.log.isDebugEnabled()) {
LogHolder.log.debug(WRITE_REPLACE_METHOD + " method was found on bean " + type + ", make sure it returns this");
}
} catch (NoSuchMethodException e) {
enhancer.setInterfaces(new Class[] { WriteReplaceInterface.class });
} catch (SecurityException e) {
// nothing to do here
}
Object enhanced;
if (constructorArgTypes.isEmpty()) {
enhanced = enhancer.create();
} else {
Class<?>[] typesArray = constructorArgTypes.toArray(new Class[constructorArgTypes.size()]);
Object[] valuesArray = constructorArgs.toArray(new Object[constructorArgs.size()]);
enhanced = enhancer.create(typesArray, valuesArray);
}
return enhanced;
}
private static class EnhancedResultObjectProxyImpl implements MethodInterceptor {
private final Class<?> type;
private final ResultLoaderMap lazyLoader;
private final boolean aggressive;
private final Set<String> lazyLoadTriggerMethods;
private final ObjectFactory objectFactory;
private final List<Class<?>> constructorArgTypes;
private final List<Object> constructorArgs;
private EnhancedResultObjectProxyImpl(Class<?> type, ResultLoaderMap lazyLoader, Configuration configuration,
ObjectFactory objectFactory, List<Class<?>> constructorArgTypes, List<Object> constructorArgs) {
this.type = type;
this.lazyLoader = lazyLoader;
this.aggressive = configuration.isAggressiveLazyLoading();
this.lazyLoadTriggerMethods = configuration.getLazyLoadTriggerMethods();
this.objectFactory = objectFactory;
this.constructorArgTypes = constructorArgTypes;
this.constructorArgs = constructorArgs;
}
public static Object createProxy(Object target, ResultLoaderMap lazyLoader, Configuration configuration,
ObjectFactory objectFactory, List<Class<?>> constructorArgTypes, List<Object> constructorArgs) {
final Class<?> type = target.getClass();
EnhancedResultObjectProxyImpl callback = new EnhancedResultObjectProxyImpl(type, lazyLoader, configuration,
objectFactory, constructorArgTypes, constructorArgs);
Object enhanced = createStaticProxy(type, callback, constructorArgTypes, constructorArgs);
PropertyCopier.copyBeanProperties(type, target, enhanced);
return enhanced;
}
@Override
public Object intercept(Object enhanced, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
final String methodName = method.getName();
try {
synchronized (lazyLoader) {
if (WRITE_REPLACE_METHOD.equals(methodName)) {
Object original;
if (constructorArgTypes.isEmpty()) {
original = objectFactory.create(type);
} else {
original = objectFactory.create(type, constructorArgTypes, constructorArgs);
}
PropertyCopier.copyBeanProperties(type, enhanced, original);
if (lazyLoader.size() > 0) {
return new CglibSerialStateHolder(original, lazyLoader.getProperties(), objectFactory,
constructorArgTypes, constructorArgs);
} else {
return original;
}
}
if (lazyLoader.size() > 0 && !FINALIZE_METHOD.equals(methodName)) {
if (aggressive || lazyLoadTriggerMethods.contains(methodName)) {
lazyLoader.loadAll();
} else if (PropertyNamer.isSetter(methodName)) {
final String property = PropertyNamer.methodToProperty(methodName);
lazyLoader.remove(property);
} else if (PropertyNamer.isGetter(methodName)) {
final String property = PropertyNamer.methodToProperty(methodName);
if (lazyLoader.hasLoader(property)) {
lazyLoader.load(property);
}
}
}
}
return methodProxy.invokeSuper(enhanced, args);
} catch (Throwable t) {
throw ExceptionUtil.unwrapThrowable(t);
}
}
}
private static class EnhancedDeserializationProxyImpl extends AbstractEnhancedDeserializationProxy
implements MethodInterceptor {
private EnhancedDeserializationProxyImpl(Class<?> type, Map<String, ResultLoaderMap.LoadPair> unloadedProperties,
ObjectFactory objectFactory, List<Class<?>> constructorArgTypes, List<Object> constructorArgs) {
super(type, unloadedProperties, objectFactory, constructorArgTypes, constructorArgs);
}
public static Object createProxy(Object target, Map<String, ResultLoaderMap.LoadPair> unloadedProperties,
ObjectFactory objectFactory, List<Class<?>> constructorArgTypes, List<Object> constructorArgs) {
final Class<?> type = target.getClass();
EnhancedDeserializationProxyImpl callback = new EnhancedDeserializationProxyImpl(type, unloadedProperties,
objectFactory, constructorArgTypes, constructorArgs);
Object enhanced = createStaticProxy(type, callback, constructorArgTypes, constructorArgs);
PropertyCopier.copyBeanProperties(type, target, enhanced);
return enhanced;
}
@Override
public Object intercept(Object enhanced, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
final Object o = super.invoke(enhanced, method, args);
return o instanceof AbstractSerialStateHolder ? o : methodProxy.invokeSuper(o, args);
}
@Override
protected AbstractSerialStateHolder newSerialStateHolder(Object userBean,
Map<String, ResultLoaderMap.LoadPair> unloadedProperties, ObjectFactory objectFactory,
List<Class<?>> constructorArgTypes, List<Object> constructorArgs) {
return new CglibSerialStateHolder(userBean, unloadedProperties, objectFactory, constructorArgTypes,
constructorArgs);
}
}
private static class LogHolder {
private static final Log log = LogFactory.getLog(CglibProxyFactory.class);
}
}