From 1fb6a28a73ca17dbb8c4b3059db590e2f9620943 Mon Sep 17 00:00:00 2001 From: antelder Date: Wed, 3 Aug 2011 09:21:41 +0000 Subject: Correct tag name git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1153404 13f79535-47bb-0310-9956-ffa450edef68 --- .../ClassLoaderServiceDiscoverer.java | 262 +++++++++++++++++++++ .../sca/extensibility/ServiceDeclaration.java | 68 ++++++ .../sca/extensibility/ServiceDiscoverer.java | 37 +++ .../sca/extensibility/ServiceDiscovery.java | 170 +++++++++++++ 4 files changed, 537 insertions(+) create mode 100644 sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ClassLoaderServiceDiscoverer.java create mode 100644 sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java create mode 100644 sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java create mode 100644 sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java (limited to 'sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility') diff --git a/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ClassLoaderServiceDiscoverer.java b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ClassLoaderServiceDiscoverer.java new file mode 100644 index 0000000000..c9bed94692 --- /dev/null +++ b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ClassLoaderServiceDiscoverer.java @@ -0,0 +1,262 @@ +/* + * 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.lang.ref.WeakReference; +import java.net.URL; +import java.net.URLConnection; +import java.security.AccessController; +import java.security.PrivilegedAction; +import java.security.PrivilegedActionException; +import java.security.PrivilegedExceptionAction; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.StringTokenizer; +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 ClassLoaderServiceDiscoverer implements ServiceDiscoverer { + private static final Logger logger = Logger.getLogger(ClassLoaderServiceDiscoverer.class.getName()); + + public class ServiceDeclarationImpl implements ServiceDeclaration { + private URL url; + private String className; + private Class javaClass; + private Map attributes; + + public ServiceDeclarationImpl(URL url, String className, Map attributes) { + super(); + this.url = url; + this.className = className; + this.attributes = attributes; + } + + public Map 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 classLoaderReference.get().loadClass(className); + } + + public String toString() { + StringBuffer sb = new StringBuffer(); + 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() { + public URL run() { + return classLoaderReference.get().getResource(name); + } + }); + } + + } + + private WeakReference classLoaderReference; + + /** + * Construct a service discoverer based on TCCL + */ + public ClassLoaderServiceDiscoverer() { + ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); + this.classLoaderReference = new WeakReference(classLoader); + } + + /** + * Construct a service discoverer using the given classloader + * @param classLoader + */ + public ClassLoaderServiceDiscoverer(ClassLoader classLoader) { + if (classLoader == null) { + classLoader = Thread.currentThread().getContextClassLoader(); + } + this.classLoaderReference = new WeakReference(classLoader); + } + + private List getResources(final String name, final boolean firstOnly) throws IOException { + try { + return AccessController.doPrivileged(new PrivilegedExceptionAction>() { + public List run() throws IOException { + if (firstOnly) { + URL url = classLoaderReference.get().getResource(name); + if (url != null) { + return Arrays.asList(url); + } else { + return Collections.emptyList(); + } + } else { + List urls = Collections.list(classLoaderReference.get().getResources(name)); + return urls; + } + } + }); + } catch (PrivilegedActionException e) { + throw (IOException)e.getException(); + } + } + + /** + * 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 static Map parseServiceDeclaration(String declaration) { + Map attributes = new HashMap(); + 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; + } + + public Set discover(String serviceName, boolean firstOnly) { + Set descriptors = new HashSet(); + + String name = "META-INF/services/" + serviceName; + boolean debug = logger.isLoggable(Level.FINE); + try { + for (final URL url : getResources(name, firstOnly)) { + 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() { + 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)); + int count = 0; + 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 attributes = parseServiceDeclaration(reg); + String className = attributes.get("class"); + if (className == null) { + // Add a unique class name to prevent equals() from returning true + className = "_class_" + count; + count++; + } + ServiceDeclarationImpl descriptor = new ServiceDeclarationImpl(url, className, attributes); + descriptors.add(descriptor); + if (firstOnly) { + return descriptors; + } + } + } + } finally { + if (reader != null) { + try { + reader.close(); + } catch (IOException e) { + // Ignore + } + } + } + } + } catch (IOException e) { + logger.log(Level.SEVERE, e.getMessage(), e); + } + return descriptors; + + } + +} diff --git a/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java new file mode 100644 index 0000000000..403b6aa7a7 --- /dev/null +++ b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java @@ -0,0 +1,68 @@ +/* + * 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.net.URL; +import java.util.Map; + +/** + * Service declaration using J2SE Jar service provider spec Classes specified + * inside this declaration are loaded using the ClassLoader used to read the + * configuration file corresponding to this declaration. + * + * @version $Rev$ $Date$ + */ +public interface ServiceDeclaration { + /** + * Load a java class in the same context as the service definition + * @param className The class name + * @return The loaded class + * @throws ClassNotFoundException + */ + Class loadClass(String className) throws ClassNotFoundException; + /** + * Get the java class for the service impl + * @return The java class + */ + Class loadClass() throws ClassNotFoundException; + /** + * Get all attributes (name=value pairs) defined for the given entry + * @return All attributes keyed by name + */ + Map getAttributes(); + + URL getLocation(); + + String getClassName(); + + URL getResource(String name); + + /** + * The service descriptor might be hashed + * @param obj Another object + * @return + */ + boolean equals(Object obj); + /** + * The service descriptor might be hashed + * @return + */ + int hashCode(); +} diff --git a/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java new file mode 100644 index 0000000000..1722cd5f49 --- /dev/null +++ b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java @@ -0,0 +1,37 @@ +/* + * 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.util.Set; + +/** + * A SPI that allows different implementations of discovering service declarations + */ +public interface ServiceDiscoverer { + /** + * Discover the service descriptors by name + * @param serviceName The name of the service + * @param firstOnly A flag to indicate if only the first instance is to be discovered + * + * @return A set of service descriptors + */ + Set discover(String serviceName, boolean firstOnly); + +} diff --git a/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java new file mode 100644 index 0000000000..a95ab253ae --- /dev/null +++ b/sca-java-1.x/tags/1.6-TUSCANY-3909/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java @@ -0,0 +1,170 @@ +/* + * 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.reflect.InvocationTargetException; +import java.lang.reflect.Method; +import java.security.AccessController; +import java.security.PrivilegedAction; +import java.util.HashSet; +import java.util.Set; +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. + * + * + * @version $Rev$ $Date$ + */ +public class ServiceDiscovery { + private static final Logger logger = Logger.getLogger(ServiceDiscovery.class.getName()); + + private final static ServiceDiscovery INSTANCE = new ServiceDiscovery(); + + private ServiceDiscoverer discoverer; + private Set registeredClassLoaders = new HashSet(); + + /** + * Get an instance of Service discovery, one instance is created per + * ClassLoader that this class is loaded from + * + * @return + */ + public static ServiceDiscovery getInstance() { + return INSTANCE; + } + + public ServiceDiscoverer getServiceDiscoverer() { + if (discoverer == null) { + discoverer = new ClassLoaderServiceDiscoverer(); + } + return discoverer; + } + + public void setServiceDiscoverer(ServiceDiscoverer sd) { + if (discoverer != null) { + throw new IllegalStateException("The ServiceDiscoverer cannot be reset"); + } + discoverer = sd; + } + + /** + * @deprecated + * Register a ClassLoader with this discovery mechanism. Tuscany extension + * ClassLoaders are registered here. + * + * @param classLoader + */ + @Deprecated + public synchronized void registerClassLoader(ClassLoader classLoader) { + registeredClassLoaders.add(classLoader); + } + + /** + * @deprecated + * Unregister a ClassLoader with this discovery mechanism. + * + * @param classLoader + */ + @Deprecated + 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 Set getServiceDeclarations(String name) throws IOException { + Set services = getServiceDiscoverer().discover(name, false); + return services; + } + + /** + * Get all service declarations for this interface + * + * @param serviceInterface + * @return set of service declarations + * @throws IOException + */ + public Set 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 Class loadFirstServiceClass(final Class serviceInterface) throws IOException, ClassNotFoundException { + // Try System property first + String className = AccessController.doPrivileged(new PrivilegedAction() { + public String run() { + return System.getProperty(serviceInterface.getName()); + } + }); + if (className != null) { + try { + // Try the classloader for the service interface first + return Class.forName(className, false, serviceInterface.getClassLoader()); + } catch (ClassNotFoundException e) { + try { + // Try the thread context classloader + return Class.forName(className, false, Thread.currentThread().getContextClassLoader()); + } catch (ClassNotFoundException ex) { + logger.log(Level.WARNING, ex.getMessage(), ex); + } + } + } + Set services = getServiceDiscoverer().discover(serviceInterface.getName(), true); + if (services.isEmpty()) { + return null; + } + return services.iterator().next().loadClass(); + } + + /** + * Create a new instance of a factory service class. + * + * @param serviceInterface + * @return service implementation class + * @throws SecurityException + * @throws NoSuchMethodException + * @throws InvocationTargetException + * @throws IllegalAccessException + */ + public Object newFactoryClassInstance(final Class serviceInterface) throws SecurityException, NoSuchMethodException, InvocationTargetException, IllegalAccessException { + Method newInstanceMethod = serviceInterface.getMethod("newInstance"); + Object factory = newInstanceMethod.invoke(null); + return factory; + } + +} -- cgit v1.2.3