org.eclipse.jetty.plus.jndi.NamingEntry Maven / Gradle / Ivy
//
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// Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
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// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
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// You may elect to redistribute this code under either of these licenses.
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package org.eclipse.jetty.plus.jndi;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.LinkRef;
import javax.naming.Name;
import javax.naming.NameParser;
import javax.naming.NamingException;
import org.eclipse.jetty.jndi.NamingUtil;
import org.eclipse.jetty.util.log.Logger;
/**
* NamingEntry
*
* Base class for all jndi related entities. Instances of
* subclasses of this class are declared in jetty.xml or in a
* webapp's WEB-INF/jetty-env.xml file.
*
* NOTE: that all NamingEntries will be bound in a single namespace.
* The "global" level is just in the top level context. The "local"
* level is a context specific to a webapp.
*/
public abstract class NamingEntry
{
private static Logger __log = NamingUtil.__log;
public static final String __contextName = "__"; //all NamingEntries stored in context called "__"
protected final Object _scope;
protected final String _jndiName; //the name representing the object associated with the NamingEntry
protected String _namingEntryNameString; //the name of the NamingEntry relative to the context it is stored in
protected String _objectNameString; //the name of the object relative to the context it is stored in
@Override
public String toString()
{
return _jndiName;
}
/**
* Create a naming entry.
*
* @param scope an object representing the scope of the name to be bound into jndi, where null means jvm scope.
* @param jndiName the name that will be associated with an object bound into jndi
* @throws NamingException if jndiName is null
*/
protected NamingEntry (Object scope, String jndiName)
throws NamingException
{
if (jndiName == null)
throw new NamingException("jndi name is null");
this._scope=scope;
this._jndiName = jndiName;
}
/**
* Create a NamingEntry.
* A NamingEntry is a name associated with a value which can later
* be looked up in JNDI by a webapp.
*
* We create the NamingEntry and put it into JNDI where it can
* be linked to the webapp's env-entry, resource-ref etc entries.
*
* @param jndiName the name of the object which will eventually be in java:comp/env
* @throws NamingException if unable to create naming entry
*/
protected NamingEntry (String jndiName)
throws NamingException
{
this (null, jndiName);
}
/**
* Add a java:comp/env binding for the object represented by this NamingEntry,
* but bind it as the name supplied
* @param localName the local name to bind
* @throws NamingException if unable to bind
*/
public void bindToENC(String localName)
throws NamingException
{
// TODO - check on the whole overriding/non-overriding thing
InitialContext ic = new InitialContext();
Context env = (Context)ic.lookup("java:comp/env");
__log.debug("Binding java:comp/env/"+localName+" to "+_objectNameString);
NamingUtil.bind(env, localName, new LinkRef(_objectNameString));
}
/**
* Unbind this NamingEntry from a java:comp/env
*/
public void unbindENC ()
{
try
{
InitialContext ic = new InitialContext();
Context env = (Context)ic.lookup("java:comp/env");
__log.debug("Unbinding java:comp/env/"+getJndiName());
env.unbind(getJndiName());
}
catch (NamingException e)
{
__log.warn(e);
}
}
/**
* Unbind this NamingEntry entirely
*/
public void release ()
{
try
{
InitialContext ic = new InitialContext();
ic.unbind(_objectNameString);
ic.unbind(_namingEntryNameString);
this._namingEntryNameString=null;
this._objectNameString=null;
}
catch (NamingException e)
{
__log.warn(e);
}
}
/**
* Get the unique name of the object
* relative to the scope
* @return the unique jndi name of the object
*/
public String getJndiName ()
{
return _jndiName;
}
/**
* Get the name of the object, fully
* qualified with the scope
* @return the name of the object, fully qualified with the scope
*/
public String getJndiNameInScope ()
{
return _objectNameString;
}
/**
* Save the NamingEntry for later use.
*
* Saving is done by binding the NamingEntry
* itself, and the value it represents into
* JNDI. In this way, we can link to the
* value it represents later, but also
* still retrieve the NamingEntry itself too.
*
* The object is bound at the jndiName passed in.
* This NamingEntry is bound at __/jndiName.
*
* eg
*
* jdbc/foo : DataSource
* __/jdbc/foo : NamingEntry
*
*
* @param object the object to save
* @throws NamingException if unable to save
*/
protected void save (Object object)
throws NamingException
{
__log.debug("SAVE {} in {}",this,_scope);
InitialContext ic = new InitialContext();
NameParser parser = ic.getNameParser("");
Name prefix = NamingEntryUtil.getNameForScope(_scope);
//bind the NamingEntry into the context
Name namingEntryName = NamingEntryUtil.makeNamingEntryName(parser, getJndiName());
namingEntryName.addAll(0, prefix);
_namingEntryNameString = namingEntryName.toString();
NamingUtil.bind(ic, _namingEntryNameString, this);
//bind the object as well
Name objectName = parser.parse(getJndiName());
objectName.addAll(0, prefix);
_objectNameString = objectName.toString();
NamingUtil.bind(ic, _objectNameString, object);
}
}