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/*
* 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 static org.apache.tuscany.sca.extensibility.ServiceDeclarationParser.parseDeclaration;
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.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
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 ClassLoader getContextClassLoader() {
return classLoaderReference.get();
}
private List<URL> getResources(final String name) throws IOException {
try {
return AccessController.doPrivileged(new PrivilegedExceptionAction<List<URL>>() {
public List<URL> run() throws IOException {
List<URL> urls = Collections.list(classLoaderReference.get().getResources(name));
return 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());
}
// 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();
}
if (isPropertyFile) {
// Load as a property file
Properties props = new Properties();
props.load(is);
is.close();
for (Map.Entry<Object, Object> e : props.entrySet()) {
Map<String, String> attributes = new HashMap<String, String>();
String key = (String)e.getKey();
String value = (String)e.getValue();
// Unfortunately, the xalan file only has the classname
if (value == null || "".equals(value)) {
value = key;
key = "";
}
if (!"".equals(key)) {
attributes.put(key, value);
attributes.put("uri", key);
}
attributes.putAll(parseDeclaration(value));
ServiceDeclarationImpl descriptor = new ServiceDeclarationImpl(url, value, attributes);
descriptors.add(descriptor);
}
continue;
}
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<String, String> attributes = parseDeclaration(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);
}
}
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// Ignore
}
}
}
}
} catch (IOException e) {
logger.log(Level.SEVERE, e.getMessage(), e);
}
return descriptors;
}
}
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