org.apache.naming.java.javaURLContextFactory 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.java;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.spi.InitialContextFactory;
import javax.naming.spi.ObjectFactory;
import org.apache.naming.ContextBindings;
import org.apache.naming.NamingContext;
import org.apache.naming.SelectorContext;
/**
* Context factory for the "java:" namespace.
*
* Important note : This factory MUST be associated with the "java" URL
* prefix, which can be done by either :
*
* - Adding a
* java.naming.factory.url.pkgs=org.apache.naming property
* to the JNDI properties file
* - Setting an environment variable named Context.URL_PKG_PREFIXES with
* its value including the org.apache.naming package name.
* More detail about this can be found in the JNDI documentation :
* {@link javax.naming.spi.NamingManager#getURLContext(String, java.util.Hashtable)}.
*
*
* @author Remy Maucherat
*/
public class javaURLContextFactory
implements ObjectFactory, InitialContextFactory {
// ----------------------------------------------------------- Constructors
// -------------------------------------------------------------- Constants
public static final String MAIN = "initialContext";
// ----------------------------------------------------- Instance Variables
/**
* Initial context.
*/
protected static volatile Context initialContext = null;
// --------------------------------------------------------- Public Methods
// -------------------------------------------------- ObjectFactory Methods
/**
* Create a new Context's instance.
* @param obj unused
* @param name unused
* @param nameCtx unused
* @param environment the environment used
* @return a selector context if the thread or classloader are bound, and
* null otherwise
* @throws NamingException not thrown by this implementationm
*/
@SuppressWarnings("unchecked")
@Override
public Object getObjectInstance(Object obj, Name name, Context nameCtx,
Hashtable environment)
throws NamingException {
if ((ContextBindings.isThreadBound()) ||
(ContextBindings.isClassLoaderBound())) {
return new SelectorContext((Hashtable)environment);
}
return null;
}
/**
* Get a new (writable) initial context.
* @param environment the environment used
* @return a selector context if the thread or classloader are bound, and
* a shared writable context otherwise
* @throws NamingException not thrown by this implementationm
*/
@SuppressWarnings("unchecked")
@Override
public Context getInitialContext(Hashtable environment)
throws NamingException {
if (ContextBindings.isThreadBound() ||
(ContextBindings.isClassLoaderBound())) {
// Redirect the request to the bound initial context
return new SelectorContext(
(Hashtable)environment, true);
}
// If the thread is not bound, return a shared writable context
if (initialContext == null) {
synchronized(javaURLContextFactory.class) {
if (initialContext == null) {
initialContext = new NamingContext(
(Hashtable)environment, MAIN);
}
}
}
return initialContext;
}
}