Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 * * http://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.openejb.cdi; import org.apache.openejb.core.ParentClassLoaderFinder; import org.apache.openejb.loader.SystemInstance; import org.apache.openejb.util.LogCategory; import org.apache.openejb.util.Logger; import org.apache.openejb.util.classloader.ClassLoaderAwareHandler; import org.apache.webbeans.service.DefaultLoaderService; import org.apache.webbeans.spi.LoaderService; import org.apache.webbeans.spi.plugins.OpenWebBeansPlugin; import javax.enterprise.inject.spi.Extension; import java.lang.reflect.Proxy; import java.net.URL; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.Enumeration; import java.util.Iterator; import java.util.List; /** * @version $Rev$ $Date$ */ public class OptimizedLoaderService implements LoaderService { private static final Logger log = Logger.getInstance(LogCategory.OPENEJB.createChild("cdi"), OptimizedLoaderService.class); public static final ThreadLocal<Collection<String>> ADDITIONAL_EXTENSIONS = new ThreadLocal<Collection<String>>(); private final LoaderService loaderService; public OptimizedLoaderService() { this(new DefaultLoaderService()); } public OptimizedLoaderService(final LoaderService loaderService) { this.loaderService = loaderService; } @Override public <T> List<T> load(final Class<T> serviceType) { return load(serviceType, Thread.currentThread().getContextClassLoader()); } @Override public <T> List<T> load(final Class<T> serviceType, final ClassLoader classLoader) { // ServiceLoader is expensive (can take up to a half second). This is an optimization if (OpenWebBeansPlugin.class.equals(serviceType)) { return (List<T>) loadWebBeansPlugins(classLoader); } // As far as we know, this only is reached for CDI Extension discovery if (Extension.class.equals(serviceType)) { return (List<T>) loadExtensions(classLoader); } return loaderService.load(serviceType, classLoader); } protected List<? extends Extension> loadExtensions(final ClassLoader classLoader) { final List<Extension> list = loaderService.load(Extension.class, classLoader); final Collection<String> additional = ADDITIONAL_EXTENSIONS.get(); if (additional != null) { for (final String name : additional) { try { list.add(Extension.class.cast(classLoader.loadClass(name).newInstance())); } catch (final Exception ignored) { // no-op } } } final Collection<Extension> extensionCopy = new ArrayList<>(list); final Iterator<Extension> it = list.iterator(); while (it.hasNext()) { if (it.hasNext()) { if (isFiltered(extensionCopy, it.next())) { it.remove(); } } } return list; } // mainly intended to avoid conflicts between internal and overrided spec extensions private boolean isFiltered(final Collection<Extension> extensions, final Extension next) { final ClassLoader containerLoader = ParentClassLoaderFinder.Helper.get(); final Class<? extends Extension> extClass = next.getClass(); if (extClass.getClassLoader() != containerLoader) { return false; } final String name = extClass.getName(); switch (name) { case "org.apache.bval.cdi.BValExtension": for (final Extension e : extensions) { final String en = e.getClass().getName(); // org.hibernate.validator.internal.cdi.ValidationExtension but allowing few evolutions of packages if (en.startsWith("org.hibernate.validator.") && en.endsWith("ValidationExtension")) { log.info("Skipping BVal CDI integration cause hibernate was found in the application"); return true; } } break; case "org.apache.batchee.container.cdi.BatchCDIInjectionExtension": // see org.apache.openejb.batchee.BatchEEServiceManager return "true".equals(SystemInstance.get().getProperty("tomee.batchee.cdi.use-extension", "false")); case "org.apache.commons.jcs.jcache.cdi.MakeJCacheCDIInterceptorFriendly": final String spi = "META-INF/services/javax.cache.spi.CachingProvider"; try { final Enumeration<URL> appResources = Thread.currentThread().getContextClassLoader() .getResources(spi); if (appResources != null && appResources.hasMoreElements()) { final Collection<URL> containerResources = Collections.list(containerLoader.getResources(spi)); do { if (!containerResources.contains(appResources.nextElement())) { log.info( "Skipping JCS CDI integration cause another provide was found in the application"); return true; } } while (appResources.hasMoreElements()); } } catch (final Exception e) { // no-op } break; default: } return false; } private List<? extends OpenWebBeansPlugin> loadWebBeansPlugins(final ClassLoader loader) { final List<OpenWebBeansPlugin> list = new ArrayList<>(2); list.add(new CdiPlugin()); { final Class<?> clazz; try { clazz = loader.loadClass("org.apache.geronimo.openejb.cdi.GeronimoWebBeansPlugin"); try { list.add(OpenWebBeansPlugin.class.cast(clazz.newInstance())); } catch (final Exception e) { log.error("Unable to load OpenWebBeansPlugin: GeronimoWebBeansPlugin"); } } catch (final ClassNotFoundException e) { // ignore } } { final Class<?> clazz; try { clazz = loader.loadClass("org.apache.webbeans.jsf.plugin.OpenWebBeansJsfPlugin"); try { list.add(OpenWebBeansPlugin.class.cast(Proxy.newProxyInstance(loader, new Class<?>[] { OpenWebBeansPlugin.class }, new ClassLoaderAwareHandler(clazz.getSimpleName(), clazz.newInstance(), loader)))); } catch (final Exception e) { log.error("Unable to load OpenWebBeansPlugin: OpenWebBeansJsfPlugin"); } } catch (final ClassNotFoundException e) { // ignore } } return list; } }