diff options
Diffstat (limited to 'sca-java-2.x/tags/2.0-M5.1-RC2/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java')
-rw-r--r-- | sca-java-2.x/tags/2.0-M5.1-RC2/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/sca-java-2.x/tags/2.0-M5.1-RC2/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java b/sca-java-2.x/tags/2.0-M5.1-RC2/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java deleted file mode 100644 index eec4ff1734..0000000000 --- a/sca-java-2.x/tags/2.0-M5.1-RC2/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java +++ /dev/null @@ -1,179 +0,0 @@ -/* - * 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.tuscany.sca.extensibility; - -import java.io.IOException; -import java.lang.ref.WeakReference; -import java.net.URL; -import java.security.AccessController; -import java.security.PrivilegedAction; -import java.security.PrivilegedActionException; -import java.security.PrivilegedExceptionAction; -import java.util.Collection; -import java.util.Collections; -import java.util.HashSet; -import java.util.List; -import java.util.Map; -import java.util.logging.Level; -import java.util.logging.Logger; - -/** - * A ServiceDiscoverer that find META-INF/services/... using the Context ClassLoader. - * - * @version $Rev$ $Date$ - */ -public class ContextClassLoaderServiceDiscoverer implements ServiceDiscoverer { - private static final Logger logger = Logger.getLogger(ContextClassLoaderServiceDiscoverer.class.getName()); - - public class ServiceDeclarationImpl implements ServiceDeclaration { - private URL url; - private String className; - private Class<?> javaClass; - private Map<String, String> attributes; - - public ServiceDeclarationImpl(URL url, String className, Map<String, String> attributes) { - super(); - this.url = url; - this.className = className; - this.attributes = attributes; - } - - public Map<String, String> getAttributes() { - return attributes; - } - - public String getClassName() { - return className; - } - - public URL getLocation() { - return url; - } - - public Class<?> loadClass() throws ClassNotFoundException { - if (className == null) { - return null; - } - if (javaClass == null) { - javaClass = loadClass(className); - } - return javaClass; - } - - public Class<?> loadClass(String className) throws ClassNotFoundException { - return Class.forName(className, false, classLoaderReference.get()); - } - - @Override - public String toString() { - StringBuffer sb = new StringBuffer(); - sb.append("Location: ").append(url); - sb.append(" ClassLoader: ").append(classLoaderReference.get()); - sb.append(" Attributes: ").append(attributes); - return sb.toString(); - } - - public URL getResource(final String name) { - return AccessController.doPrivileged(new PrivilegedAction<URL>() { - public URL run() { - return classLoaderReference.get().getResource(name); - } - }); - } - - public boolean isAssignableTo(Class<?> serviceType) { - try { - loadClass(); - } catch (ClassNotFoundException e) { - // Ignore - } - return (javaClass != null && serviceType.isAssignableFrom(javaClass)); - } - } - - private WeakReference<ClassLoader> classLoaderReference; - - public ContextClassLoaderServiceDiscoverer() { - ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); - this.classLoaderReference = new WeakReference<ClassLoader>(classLoader); - } - - public ContextClassLoaderServiceDiscoverer(ClassLoader classLoader) { - if (classLoader == null) { - classLoader = Thread.currentThread().getContextClassLoader(); - } - this.classLoaderReference = new WeakReference<ClassLoader>(classLoader); - } - - public ClassLoader getContextClassLoader() { - //return classLoaderReference.get(); - return Thread.currentThread().getContextClassLoader(); - } - - private Collection<URL> getResources(final String name) throws IOException { - try { - return AccessController.doPrivileged(new PrivilegedExceptionAction<Collection<URL>>() { - public Collection<URL> run() throws IOException { - List<URL> urls = Collections.list(classLoaderReference.get().getResources(name)); - // Eliminate the duplicate URLs (which can be found from child/parent classloaders) - return new HashSet<URL>(urls); - } - }); - } catch (PrivilegedActionException e) { - throw (IOException)e.getException(); - } - } - - public ServiceDeclaration getServiceDeclaration(String name) throws IOException { - Collection<ServiceDeclaration> declarations = getServiceDeclarations(name); - if (declarations.isEmpty()) { - return null; - } else { - return declarations.iterator().next(); - } - } - - public Collection<ServiceDeclaration> getServiceDeclarations(String serviceName) { - Collection<ServiceDeclaration> descriptors = new HashSet<ServiceDeclaration>(); - - // http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/xpath/XPathFactory.html - boolean isPropertyFile = "javax.xml.xpath.XPathFactory".equals(serviceName); - String name = "META-INF/services/" + serviceName; - boolean debug = logger.isLoggable(Level.FINE); - try { - for (final URL url : getResources(name)) { - if (debug) { - logger.fine("Reading service provider file: " + url.toExternalForm()); - } - - for (Map<String, String> attributes : ServiceDeclarationParser.load(url, isPropertyFile)) { - String className = attributes.get("class"); - ServiceDeclarationImpl descriptor = new ServiceDeclarationImpl(url, className, attributes); - descriptors.add(descriptor); - } - } - } catch (IOException e) { - logger.log(Level.SEVERE, e.getMessage(), e); - } - return descriptors; - - } - -} |