jakarta.xml.soap.FactoryFinder Maven / Gradle / Ivy
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/*
* Copyright (c) 2004, 2024 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package jakarta.xml.soap;
import java.lang.reflect.Method;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
class FactoryFinder {
private static final Logger logger;
private static final ServiceLoaderUtil.ExceptionHandler EXCEPTION_HANDLER =
new ServiceLoaderUtil.ExceptionHandler<>() {
@Override
public SOAPException createException(Throwable throwable, String message) {
return new SOAPException(message, throwable);
}
};
private final static PrivilegedAction propertyAction = () -> System.getProperty("saaj.debug");
static {
logger = Logger.getLogger("jakarta.xml.soap");
try {
if (AccessController.doPrivileged(propertyAction) != null) {
// disconnect the logger from a bigger framework (if any)
// and take the matters into our own hands
logger.setUseParentHandlers(false);
logger.setLevel(Level.ALL);
ConsoleHandler handler = new ConsoleHandler();
handler.setLevel(Level.ALL);
logger.addHandler(handler);
} else {
// don't change the setting of this logger
// to honor what other frameworks
// have done on configurations.
}
} catch (Throwable t) {
// just to be extra safe. in particular System.getProperty may throw
// SecurityException.
logger.log(Level.SEVERE, "Exception during loading the class", t);
}
}
/**
* Finds the implementation {@code Class} object for the given
* factory type. If it fails and {@code tryFallback} is {@code true}
* finds the {@code Class} object for the given default class name.
* The arguments supplied must be used in order
* Note the default class name may be needed even if fallback
* is not to be attempted in order to check if requested type is fallback.
*
* This method is package private so that this code can be shared.
*
* @return the {@code Class} object of the specified message factory;
* may not be {@code null}
*
* @param factoryClass factory abstract class or interface to be found
* @param defaultClassName the implementation class name, which is
* to be used only if nothing else
* is found; {@code null} to indicate
* that there is no default class name
* @param tryFallback whether to try the default class as a
* fallback
* @exception SOAPException if there is a SOAP error
*/
@SuppressWarnings("unchecked")
static T find(Class factoryClass,
String defaultClassName,
boolean tryFallback) throws SOAPException {
ClassLoader tccl = ServiceLoaderUtil.contextClassLoader(EXCEPTION_HANDLER);
String factoryId = factoryClass.getName();
// Use the system property first
String className = fromSystemProperty(factoryId);
if (className != null) {
Object result = newInstance(className, defaultClassName, tccl);
if (result != null) {
return (T) result;
}
}
// standard services: java.util.ServiceLoader
T factory = ServiceLoaderUtil.firstByServiceLoader(
factoryClass,
logger,
EXCEPTION_HANDLER);
if (factory != null) {
return factory;
}
// handling Glassfish/OSGi (platform specific default)
if (isOsgi()) {
Object result = lookupUsingOSGiServiceLoader(factoryId);
if (result != null) {
return (T) result;
}
}
// If not found and fallback should not be tried, return a null result.
if (!tryFallback)
return null;
// We didn't find the class through the usual means so try the default
// (built in) factory if specified.
if (defaultClassName == null) {
throw new SOAPException(
"Provider for " + factoryId + " cannot be found", null);
}
logger.fine("Trying to create the default implementation of the message factory");
return (T) newInstance(defaultClassName, defaultClassName, tccl);
}
private static Object newInstance(String className, String defaultClassName, ClassLoader tccl) throws SOAPException {
Object newInstance = ServiceLoaderUtil.newInstance(
className,
defaultClassName,
tccl,
EXCEPTION_HANDLER);
if (logger.isLoggable(Level.FINE)) {
// extra check to avoid costly which operation if not logged
Class newInstanceClass = newInstance.getClass();
logger.log(
Level.FINE,
"loaded {0} from {1}", new Object[]{newInstanceClass.getName(), which(newInstanceClass)}
);
}
return newInstance;
}
private static String fromSystemProperty(String factoryId) {
String systemProp = getSystemProperty(factoryId);
return systemProp;
}
private static String getSystemProperty(final String property) {
logger.log(Level.FINE, "Checking system property {0}", property);
String value = AccessController.doPrivileged(new PrivilegedAction<>() {
@Override
public String run() {
return System.getProperty(property);
}
});
logFound(value);
return value;
}
private static void logFound(String value) {
if (value != null) {
logger.log(Level.FINE, " found {0}", value);
} else {
logger.log(Level.FINE, " not found");
}
}
private static final String OSGI_SERVICE_LOADER_CLASS_NAME = "org.glassfish.hk2.osgiresourcelocator.ServiceLoader";
private static boolean isOsgi() {
try {
Class.forName(OSGI_SERVICE_LOADER_CLASS_NAME);
return true;
} catch (ClassNotFoundException ignored) {
logger.log(
Level.FINER,
"Class " + OSGI_SERVICE_LOADER_CLASS_NAME + " cannot be loaded",
ignored
);
}
return false;
}
private static T lookupUsingOSGiServiceLoader(String factoryId) {
try {
logger.fine("Trying to create the provider from the OSGi ServiceLoader");
// Use reflection to avoid having any dependendcy on HK2 ServiceLoader class
Class serviceClass = Class.forName(factoryId);
Class[] args = new Class[]{serviceClass};
Class target = Class.forName(OSGI_SERVICE_LOADER_CLASS_NAME);
Method m = target.getMethod("lookupProviderInstances", Class.class);
@SuppressWarnings({"unchecked"})
Iterator iter = ((Iterable) m.invoke(null, (Object[]) args)).iterator();
return iter.hasNext() ? iter.next() : null;
} catch (Exception ignored) {
// log and continue
logger.log(
Level.FINER,
"Access to the system property with key " + factoryId + " is not allowed",
ignored
);
return null;
}
}
/**
* Get the URL for the Class from it's ClassLoader.
*
* Convenience method for {@link #which(Class, ClassLoader)}.
*
* Equivalent to calling: which(clazz, clazz.getClassLoader())
*
* @param clazz
* The class to search for
* @return
* the URL for the class or null if it wasn't found
*/
static URL which(Class clazz) {
return which(clazz, getClassClassLoader(clazz));
}
/**
* Search the given ClassLoader for an instance of the specified class and
* return a string representation of the URL that points to the resource.
*
* @param clazz
* The class to search for
* @param loader
* The ClassLoader to search. If this parameter is null, then the
* system class loader will be searched
* @return
* the URL for the class or null if it wasn't found
*/
static URL which(Class clazz, ClassLoader loader) {
String classnameAsResource = clazz.getName().replace('.', '/') + ".class";
if (loader == null) {
loader = getSystemClassLoader();
}
return loader.getResource(classnameAsResource);
}
private static ClassLoader getSystemClassLoader() {
if (System.getSecurityManager() == null) {
return ClassLoader.getSystemClassLoader();
} else {
return java.security.AccessController.doPrivileged(
(PrivilegedAction) ClassLoader::getSystemClassLoader);
}
}
private static ClassLoader getClassClassLoader(final Class c) {
if (System.getSecurityManager() == null) {
return c.getClassLoader();
} else {
return java.security.AccessController.doPrivileged(
(PrivilegedAction) c::getClassLoader);
}
}
}