org.apache.naming.factory.ResourceLinkFactory Maven / Gradle / Ivy
/*
* 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.naming.factory;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;
import org.apache.naming.ResourceLinkRef;
import org.apache.naming.StringManager;
/**
* Object factory for resource links.
*
* @author Remy Maucherat
*/
public class ResourceLinkFactory implements ObjectFactory {
// ------------------------------------------------------- Static Variables
protected static final StringManager sm = StringManager.getManager(ResourceLinkFactory.class);
/**
* Global naming context.
*/
private static Context globalContext = null;
private static Map> globalResourceRegistrations =
new ConcurrentHashMap<>();
// --------------------------------------------------------- Public Methods
/**
* Set the global context (note: can only be used once).
*
* @param newGlobalContext new global context value
*/
public static void setGlobalContext(Context newGlobalContext) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new RuntimePermission(
ResourceLinkFactory.class.getName() + ".setGlobalContext"));
}
globalContext = newGlobalContext;
}
public static void registerGlobalResourceAccess(Context globalContext, String localName,
String globalName) {
validateGlobalContext(globalContext);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
// Web application initialization is single threaded so this is
// safe.
globalResourceRegistrations.computeIfAbsent(cl, k -> new HashMap<>()).put(localName, globalName);
}
public static void deregisterGlobalResourceAccess(Context globalContext, String localName) {
validateGlobalContext(globalContext);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Map registrations = globalResourceRegistrations.get(cl);
if (registrations != null) {
registrations.remove(localName);
}
}
public static void deregisterGlobalResourceAccess(Context globalContext) {
validateGlobalContext(globalContext);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
globalResourceRegistrations.remove(cl);
}
private static void validateGlobalContext(Context globalContext) {
if (ResourceLinkFactory.globalContext != null &&
ResourceLinkFactory.globalContext != globalContext) {
throw new SecurityException(sm.getString("resourceLinkFactory.invalidGlobalContext"));
}
}
private static boolean validateGlobalResourceAccess(String globalName) {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
while (cl != null) {
Map registrations = globalResourceRegistrations.get(cl);
if (registrations != null && registrations.containsValue(globalName)) {
return true;
}
cl = cl.getParent();
}
return false;
}
// -------------------------------------------------- ObjectFactory Methods
/**
* Create a new resource instance.
*
* @param name the bound name
* @param nameCtx unused
* @param environment unused
* @return the object instance
* @throws NamingException if an error occur creating the instance
*/
@Override
public Object getObjectInstance(Object obj, Name name, Context nameCtx,
Hashtable environment) throws NamingException {
if (!(obj instanceof ResourceLinkRef)) {
return null;
}
// Can we process this request?
Reference ref = (Reference) obj;
// Read the global ref addr
String globalName = null;
RefAddr refAddr = ref.get(ResourceLinkRef.GLOBALNAME);
if (refAddr != null) {
globalName = refAddr.getContent().toString();
// Confirm that the current web application is currently configured
// to access the specified global resource
if (!validateGlobalResourceAccess(globalName)) {
return null;
}
Object result = null;
result = globalContext.lookup(globalName);
// Check the expected type
String expectedClassName = ref.getClassName();
if (expectedClassName == null) {
throw new IllegalArgumentException(
sm.getString("resourceLinkFactory.nullType", name, globalName));
}
try {
Class expectedClazz = Class.forName(
expectedClassName, true, Thread.currentThread().getContextClassLoader());
if (!expectedClazz.isAssignableFrom(result.getClass())) {
throw new IllegalArgumentException(sm.getString("resourceLinkFactory.wrongType",
name, globalName, expectedClassName, result.getClass().getName()));
}
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException(sm.getString("resourceLinkFactory.unknownType",
name, globalName, expectedClassName), e);
}
return result;
}
return null;
}
}