001 /**
002 * GRANITE DATA SERVICES
003 * Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 * This file is part of the Granite Data Services Platform.
006 *
007 * Granite Data Services is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * Granite Data Services is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 * General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 * USA, or see <http://www.gnu.org/licenses/>.
021 */
022 package org.granite.hibernate4;
023
024 import java.io.Serializable;
025 import java.lang.reflect.Field;
026 import java.lang.reflect.Method;
027 import java.lang.reflect.Type;
028 import java.util.concurrent.ConcurrentHashMap;
029
030 import javax.persistence.EmbeddedId;
031 import javax.persistence.Id;
032
033 import org.granite.config.GraniteConfig;
034 import org.granite.context.GraniteContext;
035 import org.granite.messaging.service.ServiceException;
036 import org.granite.util.TypeUtil;
037 import org.granite.util.Introspector;
038 import org.granite.util.PropertyDescriptor;
039 import org.hibernate.engine.spi.SessionImplementor;
040 import org.hibernate.proxy.HibernateProxy;
041 import org.hibernate.type.CompositeType;
042
043 /**
044 * @author Franck WOLFF
045 */
046 public class ProxyFactory {
047
048 private static final Class<?>[] INTERFACES = new Class<?>[]{HibernateProxy.class};
049 private static final Class<?>[] SINGLE_OBJECT_PARAMS = new Class<?>[]{Object.class};
050 private static final Method OBJECT_EQUALS;
051 static {
052 try {
053 OBJECT_EQUALS = Object.class.getMethod("equals", SINGLE_OBJECT_PARAMS);
054 }
055 catch (Exception e) {
056 throw new ExceptionInInitializerError(e);
057 }
058 }
059
060 protected final ConcurrentHashMap<Class<?>, Object[]> identifierInfos = new ConcurrentHashMap<Class<?>, Object[]>();
061
062 private final Method getProxyFactory;
063 private final Method getProxy;
064 private final boolean classOverridesEqualsParameter;
065
066 public ProxyFactory(String initializerClassName) {
067 try {
068 // Get proxy methods: even if CGLIB/Javassist LazyInitializer implementations share a common
069 // superclass, getProxyFactory/getProxy methods are declared as static in each inherited
070 // class with the same signature.
071 Class<?> initializerClass = TypeUtil.forName(initializerClassName);
072 getProxyFactory = initializerClass.getMethod("getProxyFactory", new Class[] { Class.class, Class[].class });
073
074 // Hibernate 4.0.1 has an extra boolean parameter in last position: classOverridesEquals.
075 Method getProxy = null;
076 boolean classOverridesEqualsParameter = false;
077 try {
078 getProxy = initializerClass.getMethod("getProxy", new Class[]{
079 Class.class, String.class, Class.class, Class[].class, Method.class, Method.class,
080 CompositeType.class, Serializable.class, SessionImplementor.class
081 });
082 }
083 catch (NoSuchMethodException e) {
084 getProxy = initializerClass.getMethod("getProxy", new Class[]{
085 Class.class, String.class, Class.class, Class[].class, Method.class, Method.class,
086 CompositeType.class, Serializable.class, SessionImplementor.class, Boolean.TYPE
087 });
088 classOverridesEqualsParameter = true;
089 }
090 this.getProxy = getProxy;
091 this.classOverridesEqualsParameter = classOverridesEqualsParameter;
092 }
093 catch (Exception e) {
094 throw new ServiceException("Could not introspect initializer class: " + initializerClassName, e);
095 }
096 }
097
098 public HibernateProxy getProxyInstance(String persistentClassName, String entityName, Serializable id) {
099 try {
100 // Get ProxyFactory.
101 Class<?> persistentClass = TypeUtil.forName(persistentClassName);
102 Class<?> factory = (Class<?>)getProxyFactory.invoke(null, new Object[] { persistentClass, INTERFACES });
103
104 // Convert id (if necessary).
105 Object[] identifierInfo = getIdentifierInfo(persistentClass);
106 Type identifierType = (Type)identifierInfo[0];
107 Method identifierGetter = (Method)identifierInfo[1];
108 if (id == null || !identifierType.equals(id.getClass())) {
109 GraniteConfig config = GraniteContext.getCurrentInstance().getGraniteConfig();
110 id = (Serializable)config.getConverters().convert(id, identifierType);
111 }
112
113 // Get Proxy (with or without the extra parameter classOverridesEquals)
114 if (classOverridesEqualsParameter) {
115 return (HibernateProxy)getProxy.invoke(null, new Object[]{
116 factory, entityName, persistentClass, INTERFACES, identifierGetter, null, null, id, null, overridesEquals(persistentClass)});
117 }
118 return (HibernateProxy)getProxy.invoke(null, new Object[] { factory, entityName, persistentClass, INTERFACES, identifierGetter, null, null, id, null });
119 }
120 catch (Exception e) {
121 throw new ServiceException("Error with proxy description: " + persistentClassName + '/' + entityName + " and id: " + id, e);
122 }
123 }
124
125 protected boolean overridesEquals(Class<?> persistentClass) {
126 try {
127 return !OBJECT_EQUALS.equals(persistentClass.getMethod("equals", SINGLE_OBJECT_PARAMS));
128 }
129 catch (Exception e) {
130 return false; // should never happen unless persistentClass is an interface...
131 }
132 }
133
134 protected Object[] getIdentifierInfo(Class<?> persistentClass) {
135
136 Object[] info = identifierInfos.get(persistentClass);
137 if (info != null)
138 return info;
139
140 Type type = null;
141 Method getter = null;
142 for (Class<?> clazz = persistentClass; clazz != Object.class && clazz != null; clazz = clazz.getSuperclass()) {
143 for (Field field : clazz.getDeclaredFields()) {
144 if (field.isAnnotationPresent(Id.class) || field.isAnnotationPresent(EmbeddedId.class)) {
145 type = field.getGenericType();
146 break;
147 }
148 }
149 }
150
151 if (type == null) {
152 PropertyDescriptor[] propertyDescriptors = Introspector.getPropertyDescriptors(persistentClass);
153
154 for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
155 Method method = propertyDescriptor.getReadMethod();
156 if (method != null && (
157 method.isAnnotationPresent(Id.class) ||
158 method.isAnnotationPresent(EmbeddedId.class))) {
159 type = method.getGenericReturnType();
160 getter = method;
161 break;
162 }
163 method = propertyDescriptor.getWriteMethod();
164 if (method != null && (
165 method.isAnnotationPresent(Id.class) ||
166 method.isAnnotationPresent(EmbeddedId.class))) {
167 type = method.getGenericParameterTypes()[0];
168 break;
169 }
170 }
171 }
172
173 if (type != null) {
174 info = new Object[] { type, getter };
175 Object[] previousInfo = identifierInfos.putIfAbsent(persistentClass, info);
176 if (previousInfo != null)
177 info = previousInfo; // should be the same...
178 return info;
179 }
180
181 throw new IllegalArgumentException("Could not find id in: " + persistentClass);
182 }
183 }