Java tutorial
/* * ============================================================================ * GNU Lesser General Public License * ============================================================================ * * Beanlet - JSE Application Container. * Copyright (C) 2006 Leon van Zantvoort * * This library 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. * * This library 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. * * Leon van Zantvoort * 243 Acalanes Drive #11 * Sunnyvale, CA 94086 * USA * * zantvoort@users.sourceforge.net * http://beanlet.org */ package org.beanlet.springframework.impl; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.HashMap; import java.util.Map; import java.util.WeakHashMap; import org.beanlet.annotation.AnnotationDeclaration; import org.beanlet.annotation.ConstructorElement; import org.beanlet.annotation.ConstructorParameterElement; import org.beanlet.annotation.Element; import org.beanlet.annotation.MethodElement; import org.beanlet.annotation.MethodParameterElement; import org.beanlet.annotation.PackageElement; import org.beanlet.annotation.TypeElement; import org.beanlet.plugin.BeanletConfiguration; import org.beanlet.springframework.SpringContext; import org.beanlet.springframework.SpringResource; import org.springframework.beans.factory.ListableBeanFactory; import org.springframework.beans.factory.support.BeanDefinitionReader; import org.springframework.beans.factory.support.BeanDefinitionRegistry; import org.springframework.beans.factory.support.DefaultListableBeanFactory; import org.springframework.beans.factory.support.PropertiesBeanDefinitionReader; import org.springframework.beans.factory.xml.XmlBeanDefinitionReader; import org.springframework.context.ApplicationContextException; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.support.GenericApplicationContext; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.FileSystemResource; import org.springframework.core.io.Resource; import org.springframework.core.io.UrlResource; /** * * @author Leon van Zantvoort */ public final class SpringHelper { private static final WeakHashMap<ClassLoader, Map<SpringContext, ListableBeanFactory>> factories = new WeakHashMap<ClassLoader, Map<SpringContext, ListableBeanFactory>>(); private SpringHelper() { } public static synchronized ListableBeanFactory getListableBeanFactory(BeanletConfiguration<?> configuration, Element element) { SpringContext springContext = getSpringContext(configuration, element); if (springContext == null) { throw new ApplicationContextException("No spring context specified."); } final ClassLoader loader = configuration.getComponentUnit().getClassLoader(); Map<SpringContext, ListableBeanFactory> map = factories.get(loader); if (map == null) { map = new HashMap<SpringContext, ListableBeanFactory>(); factories.put(loader, map); } ListableBeanFactory factory = map.get(springContext); if (factory == null) { ClassLoader org = null; try { org = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() { public ClassLoader run() { // PERMISSION: java.lang.RuntimePermission getClassLoader ClassLoader org = Thread.currentThread().getContextClassLoader(); // PERMISSION: java.lang.RuntimePermission setContextClassLoader Thread.currentThread().setContextClassLoader(loader); return org; } }); if (springContext.applicationContext()) { factory = new GenericApplicationContext(); } else { factory = new DefaultListableBeanFactory(); } // Do not create spring context in priviliged scope! for (SpringResource r : springContext.value()) { String path = r.value(); Resource resource = null; BeanDefinitionReader reader = null; switch (r.type()) { case CLASSPATH: resource = new ClassPathResource(path); break; case FILESYSTEM: resource = new FileSystemResource(path); break; case URL: resource = new UrlResource(path); break; default: assert false : r.type(); } switch (r.format()) { case XML: reader = new XmlBeanDefinitionReader((BeanDefinitionRegistry) factory); break; case PROPERTIES: reader = new PropertiesBeanDefinitionReader((BeanDefinitionRegistry) factory); break; default: assert false : r.format(); } if (resource != null && resource.exists()) { reader.loadBeanDefinitions(resource); } } if (factory instanceof ConfigurableApplicationContext) { ((ConfigurableApplicationContext) factory).refresh(); } map.put(springContext, factory); } catch (RuntimeException e) { throw e; } catch (Exception e) { throw new ApplicationContextException("Failed to construct spring " + (springContext.applicationContext() ? "application context" : "bean factory") + ".", e); } finally { final ClassLoader tmp = org; AccessController.doPrivileged(new PrivilegedAction<Object>() { public Object run() { // PERMISSION: java.lang.RuntimePermission setContextClassLoader Thread.currentThread().setContextClassLoader(tmp); return null; } }); } } return factory; } public static SpringContext getSpringContext(BeanletConfiguration<?> configuration, Element element) { return getSpringContext(configuration, element, false); } public static SpringContext getSpringContext(BeanletConfiguration<?> configuration, Element element, boolean memberOnly) { final SpringContext springContext; AnnotationDeclaration<SpringContext> declaration = configuration.getAnnotationDomain() .getDeclaration(SpringContext.class); SpringContext tmp = declaration.getDeclaredAnnotation(element); if (tmp != null) { springContext = tmp; } else { if (element instanceof MethodParameterElement) { tmp = configuration.getAnnotationDomain().getDeclaration(SpringContext.class) .getAnnotation(MethodElement.instance(((MethodParameterElement) element).getMethod())); } else if (element instanceof ConstructorParameterElement) { tmp = configuration.getAnnotationDomain().getDeclaration(SpringContext.class).getAnnotation( ConstructorElement.instance(((ConstructorParameterElement) element).getConstructor())); } if (tmp != null) { springContext = tmp; } else if (!memberOnly) { Class<?> type = element.getMember().getDeclaringClass(); tmp = declaration.getDeclaredAnnotation(TypeElement.instance(type)); if (tmp != null) { springContext = tmp; } else { tmp = declaration.getDeclaredAnnotation(PackageElement.instance(type.getPackage())); if (tmp != null) { springContext = tmp; } else { springContext = null; } } } else { springContext = null; } } return springContext; } }