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Diffstat (limited to 'branches/sca-java-1.3.3/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java')
-rw-r--r-- | branches/sca-java-1.3.3/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java | 318 |
1 files changed, 0 insertions, 318 deletions
diff --git a/branches/sca-java-1.3.3/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java b/branches/sca-java-1.3.3/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java deleted file mode 100644 index 3e702ea5db..0000000000 --- a/branches/sca-java-1.3.3/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java +++ /dev/null @@ -1,318 +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.BufferedReader; -import java.io.IOException; -import java.io.InputStream; -import java.io.InputStreamReader; -import java.net.URL; -import java.net.URLConnection; -import java.security.AccessController; -import java.security.PrivilegedActionException; -import java.security.PrivilegedExceptionAction; -import java.util.ArrayList; -import java.util.Collections; -import java.util.HashMap; -import java.util.HashSet; -import java.util.Hashtable; -import java.util.Map; -import java.util.Set; -import java.util.StringTokenizer; -import java.util.logging.Level; -import java.util.logging.Logger; - -/** - * Service discovery for Tuscany based on J2SE Jar service provider spec. - * Services are described using configuration files in META-INF/services. - * Service description specifies a class name followed by optional properties. - * Multi-ClassLoader environments are supported through a ClassLoader - * registration API - * - * @version $Rev$ $Date$ - */ -public class ServiceDiscovery { - private static final Logger logger = Logger.getLogger(ServiceDiscovery.class.getName()); - - private static ServiceDiscovery instance; - - private HashSet<ClassLoader> registeredClassLoaders; - - /** - * Get an instance of Service discovery, one instance is created per - * ClassLoader that this class is loaded from - * - * @return - */ - public static ServiceDiscovery getInstance() { - - if (instance == null) { - instance = new ServiceDiscovery(); - instance.registeredClassLoaders = new HashSet<ClassLoader>(); - instance.registeredClassLoaders.add(ServiceDiscovery.class.getClassLoader()); - } - return instance; - } - - /** - * Register a ClassLoader with this discovery mechanism. Tuscany extension - * ClassLoaders are registered here. - * - * @param classLoader - */ - public synchronized void registerClassLoader(ClassLoader classLoader) { - registeredClassLoaders.add(classLoader); - } - - /** - * Unregister a ClassLoader with this discovery mechanism. - * - * @param classLoader - */ - public synchronized void unregisterClassLoader(ClassLoader classLoader) { - registeredClassLoaders.remove(classLoader); - } - - /** - * Get all service declarations for this name - * - * @param name - * @return set of service declarations - * @throws IOException - */ - public synchronized Set<ServiceDeclaration> getServiceDeclarations(String name) throws IOException { - - Set<ServiceDeclaration> classSet = new HashSet<ServiceDeclaration>(); - - for (ClassLoader classLoader : registeredClassLoaders) { - getServiceClasses(classLoader, name, classSet, true); - } - return classSet; - } - - /** - * Get all service declarations for this interface - * - * @param serviceInterface - * @return set of service declarations - * @throws IOException - */ - public Set<ServiceDeclaration> getServiceDeclarations(Class<?> serviceInterface) throws IOException { - - return getServiceDeclarations(serviceInterface.getName()); - } - - /** - * Load one service implementation class for this interface - * - * @param serviceInterface - * @return service implementation class - * @throws IOException - * @throws ClassNotFoundException - */ - public synchronized Class<?> loadFirstServiceClass(Class<?> serviceInterface) throws IOException, ClassNotFoundException { - - Set<ServiceDeclaration> classSet = new HashSet<ServiceDeclaration>(); - - for (ClassLoader classLoader : registeredClassLoaders) { - getServiceClasses(classLoader, serviceInterface.getName(), classSet, false); - if (classSet.size() > 0) - break; - } - if (classSet.size() > 0) - return classSet.iterator().next().loadClass(); - else - return null; - - } - - /** - * Returns a unique list of resource URLs of name META-INF/services/<name> - * Each URL is associated with the first ClassLoader that it was visible - * from - * - * @param name Name of resource - * @return Table of URLs with associated ClassLoaders - * @throws IOException - */ - public synchronized Hashtable<ClassLoader, Set<URL>> getServiceResources(final String name) throws IOException { - - Hashtable<ClassLoader, Set<URL>> resourceTable = new Hashtable<ClassLoader, Set<URL>>(); - - HashSet<URL> allURLs = new HashSet<URL>(); - for (final ClassLoader classLoader : registeredClassLoaders) { - HashSet<URL> urls = new HashSet<URL>(); - resourceTable.put(classLoader, urls); - boolean debug = logger.isLoggable(Level.FINE); - if (debug) { - logger.fine("Discovering service resources using class loader " + classLoader); - } - // Allow privileged access to read META-INF/services/*. Add FilePermission to added to security policy file. - ArrayList<URL> urlList; - try { - // FIXME J2 Security - promote this to callers of this method - urlList = AccessController.doPrivileged(new PrivilegedExceptionAction<ArrayList<URL>>() { - public ArrayList<URL> run() throws IOException { - return Collections.list(classLoader.getResources("META-INF/services/" + name)); - } - }); - } catch (PrivilegedActionException e) { - throw (IOException)e.getException(); - } - - for (URL url : urlList) { - if (allURLs.contains(url)) - continue; - urls.add(url); - } - allURLs.addAll(urls); - } - return resourceTable; - } - - /** - * Parse a service declaration in the form class;attr=value,attr=value and - * return a map of attributes - * - * @param declaration - * @return a map of attributes - */ - private Map<String, String> parseServiceDeclaration(String declaration) { - Map<String, String> attributes = new HashMap<String, String>(); - int index = declaration.indexOf(';'); - if (index != -1) { - attributes.put("class", declaration.substring(0, index).trim()); - declaration = declaration.substring(index); - } else { - int j = declaration.indexOf('='); - if (j == -1) { - attributes.put("class", declaration.trim()); - return attributes; - } else { - declaration = ";" + declaration; - } - } - StringTokenizer tokens = new StringTokenizer(declaration); - for (; tokens.hasMoreTokens();) { - String key = tokens.nextToken("=").substring(1).trim(); - if (key == null) - break; - String value = tokens.nextToken(",").substring(1).trim(); - if (value == null) - break; - attributes.put(key, value); - } - return attributes; - } - - /** - * Load the service class whose name specified in a configuration file - * - * @param classLoader - * @param name The name of the service class - * @param classSet Populate this set with classes extends/implements the - * service class - * @throws IOException - */ - private void getServiceClasses(final ClassLoader classLoader, - final String name, - Set<ServiceDeclaration> classSet, - boolean findAllClasses) throws IOException { - - boolean debug = logger.isLoggable(Level.FINE); - if (debug) { - logger.fine("Discovering service providers using class loader " + classLoader); - } - // Allow privileged access to read META-INF/services/*. Add FilePermission to added to - // security policy file. - ArrayList<URL> urlList; - try { - urlList = AccessController.doPrivileged(new PrivilegedExceptionAction<ArrayList<URL>>() { - public ArrayList<URL> run() throws IOException { - return Collections.list(classLoader.getResources("META-INF/services/" + name)); - } - }); - } catch (PrivilegedActionException e) { - throw (IOException)e.getException(); - } - - for (final URL url : urlList) { - if (debug) { - logger.fine("Reading service provider file: " + url.toExternalForm()); - } - - // Allow privileged access to open URL stream. Add FilePermission to added to security - // policy file. - InputStream is; - try { - is = AccessController.doPrivileged(new PrivilegedExceptionAction<InputStream>() { - public InputStream run() throws IOException { - URLConnection connection = url.openConnection(); - // TUSCANY-2539 - // Don't cache connections by default to stop Tuscany locking contribution jar files - // done here as this is one of the first places we open a stream and the only way to - // set the default is to set it on an instance of URLConnection - connection.setDefaultUseCaches(false); - connection.setUseCaches(false); - return url.openStream(); - } - }); - } catch (PrivilegedActionException e) { - throw (IOException)e.getException(); - } - BufferedReader reader = null; - try { - reader = new BufferedReader(new InputStreamReader(is)); - while (true) { - String line = reader.readLine(); - if (line == null) - break; - line = line.trim(); - if (!line.startsWith("#") && !"".equals(line)) { - String reg = line.trim(); - if (debug) { - logger.fine("Registering service provider: " + reg); - } - - Map<String, String> attributes = parseServiceDeclaration(reg); - String className = attributes.get("class"); - ServiceDeclaration serviceClass = new ServiceDeclaration(className, classLoader, attributes); - classSet.add(serviceClass); - - if (!findAllClasses) - break; - } - } - } finally { - if (reader != null) - reader.close(); - if (is != null) { - try { - is.close(); - } catch (IOException ioe) { - } - } - } - if (!findAllClasses && classSet.size() > 0) - break; - } - } - -} |