User: mnf999
Date: 01/08/29 16:19:04
Added: src/main/org/jboss/system ServiceLibraries.java
ServiceLibrariesMBean.java
Log:
The service libraries act as a repository of classes on behalf of the system. It is
inspired by Dr Jung's work on the scope but takes the separation a bit further (in teh
URL/MBean) and doesn't introduce "scopes" at this stage
Revision Changes Path
1.1 jboss/src/main/org/jboss/system/ServiceLibraries.java
Index: ServiceLibraries.java
===================================================================
/*
* JBoss, the OpenSource J2EE webOS
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.system;
import java.io.File;
import java.util.Set;
import java.net.URL;
import java.util.Map;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Collections;
import java.util.StringTokenizer;
import javax.management.ObjectName;
import javax.management.MBeanServer;
import javax.management.MBeanRegistration;
import org.jboss.system.URLClassLoader;
//import org.jboss.logging.Log;
/**
* Service Libraries.
*
* The service libraries is a central repository of all classes loaded by the
ClassLoaders
* @see <related>
* @author <a href="mailto:[EMAIL PROTECTED]";>Marc Fleury</a>
* @version $Revision: 1.1 $
*
* <p><b>20010830 marc fleury:</b>
* <ul>
* initial import
* <li>
* </ul>
*/
public class ServiceLibraries
implements ServiceLibrariesMBean, MBeanRegistration
{
// Constants -----------------------------------------------------
// Attributes ----------------------------------------------------
// The classloaders
private Set classLoaders;
// The classes kept in this library
private Map classes, resources,
// A given classloader loads a set of class
clToClassSetMap, clToResourceSetMap;
// JBoss logger version move to log4j if needed
//Log log = Log.createLog("VM-ClassLoader");
// Static --------------------------------------------------------
private static ServiceLibraries libraries;
// Constructors --------------------------------------------------
// Public --------------------------------------------------------
public static ServiceLibraries getLibraries()
{
if (libraries == null) libraries = new ServiceLibraries();
return libraries;
}
// ServiceClassLoaderMBean implementation ------------------------
public String getName()
{
return "Service Libraries";
}
public void addClassLoader(URLClassLoader cl)
{
synchronized(classLoaders) {
// we allow for duplicate class loader definitions in the
services.xml files
// we should however only keep the first classloader declared
if (!classLoaders.contains(cl))
{
classLoaders.add(cl);
System.out.println("Libraries adding URLClassLoader
"+cl.hashCode()+" URL "+((URLClassLoader) cl).getURL().toString());
}
else
{
System.out.println("Libraries skipping duplicate
URLClassLoader for URL "+((URLClassLoader) cl).getURL().toString());
}
}
};
public void removeClassLoader(URLClassLoader cl)
{
synchronized(classLoaders) {
classLoaders.remove(cl);
Set classes = (Set) clToClassSetMap.remove(cl);
Iterator iterator = classes.iterator();
while( iterator.hasNext())
{
classes.remove(iterator.next());
}
Set resources = (Set) clToResourceSetMap.remove(cl);
Iterator iterator2 = resources.iterator();
while( iterator2.hasNext())
{
resources.remove(iterator2.next());
}
};
}
public Class loadClass(String name, boolean resolve, ClassLoader scl)
throws ClassNotFoundException
{
// Try the local map already
Class foundClass = (Class) classes.get(name);
if (foundClass != null) return foundClass;
// If not start asking around to URL classloaders for it
// who will find it?
URLClassLoader cl = null;
if (scl instanceof URLClassLoader)
{
// First ask the asking classloader chances are the dependent
class is in there
try {
foundClass = ((URLClassLoader)
scl).loadClassLocally(name,resolve);
//If we get here we know the scl is the right one
cl = (URLClassLoader) scl;
}
catch (ClassNotFoundException ignored) {}
}
synchronized(classLoaders)
{
Iterator allLoaders = classLoaders.iterator();
while (allLoaders.hasNext() && (foundClass == null))
{
// next!
cl = (URLClassLoader) allLoaders.next();
if (!scl.equals(cl))
{
try {
foundClass = cl.loadClassLocally(name,
resolve);
}
catch (ClassNotFoundException ignored2) {
//try next loader
}
}
}//allLoaders
if (foundClass != null)
{
// We can keep track
classes.put(name, foundClass);
// When we cycle the cl we also need to remove the
classes it loaded
Set set = (Set) clToClassSetMap.get(cl);
if (set == null) { set = new HashSet();
clToClassSetMap.put(cl, set);}
set.add(foundClass);
return foundClass;
}
}//Synchronization
// If we reach here, all of the classloaders currently in the VM don't
know about the class
throw new ClassNotFoundException(name);
}
public URL getResource(String name, ClassLoader scl)
{
// Is it in the global map?
if (resources.containsKey(name))
{
return (URL) resources.get(name);
}
URL resource = null;
// First ask for the class to the asking class loader
if (scl instanceof URLClassLoader)
{
resource = ((URLClassLoader) scl).getResourceLocally(name);
}
if (resource == null)
{
// If not start asking around to URL classloaders for it
int i=1;
synchronized(classLoaders)
{
Iterator allLoaders = classLoaders.iterator();
while (allLoaders.hasNext())
{
URLClassLoader cl = (URLClassLoader)
allLoaders.next();
if (!cl.equals(scl))
{
resource = cl.getResourceLocally(name);
if (resource != null)
{
// We can keep track
resources.put(name, resource);
// When we cycle the cl we
also need to remove the classes it loaded
Set set = (Set)
clToResourceSetMap.get(cl);
if (set == null) { set = new
HashSet(); clToResourceSetMap.put(cl, set);}
set.add(resource);
return resource;
}
//Just cycle through the class loaders
until you find it
}
}//allLoaders
}//Synchronization
}
// If we reach here, all of the classloaders currently in the VM don't
know about the resource
return resource;
}
// The name of the system MLet
// ObjectName mlet = new ObjectName(server.getDefaultDomain(), "service",
"MLet");
public ObjectName preRegister(MBeanServer server, ObjectName name)
throws java.lang.Exception
{
//this.server = server;
classLoaders = Collections.synchronizedSet(new HashSet());
classes = Collections.synchronizedMap(new HashMap());
resources = Collections.synchronizedMap(new HashMap());
clToResourceSetMap = Collections.synchronizedMap(new HashMap());
clToClassSetMap = Collections.synchronizedMap(new HashMap());
System.out.println("[GPA] Microkernel ClassLoaders and Libraries
initialized");
return name==null ? new ObjectName(OBJECT_NAME) : name;
}
public void preDeregister()
throws java.lang.Exception
{
}
public void postRegister(Boolean b) {}
public void postDeregister()
{
}
// Y overrides ---------------------------------------------------
// Package protected ---------------------------------------------
// Protected -----------------------------------------------------
// Private -------------------------------------------------------
// Inner classes -------------------------------------------------
}
1.1 jboss/src/main/org/jboss/system/ServiceLibrariesMBean.java
Index: ServiceLibrariesMBean.java
===================================================================
/*
* JBoss, the OpenSource EJB server
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.system;
import java.net.URL;
/**
* <description>
*
* @see <related>
* @author <a href="mailto:[EMAIL PROTECTED]";>Marc Fleury</a>
* @version $Revision: 1.1 $
*
*/
public interface ServiceLibrariesMBean
{
// Constants -----------------------------------------------------
public static final String OBJECT_NAME = "JBOSS-SYSTEM:service=Libraries";
// Static --------------------------------------------------------
// Public --------------------------------------------------------
/* The ServicesLibraries MBean should expose "soft" information like the
dependencies graph
for example give a URL and find out what MBean need to be restarted in case
you cycle that URL
*/
}
/**
* <p><b>Revisions:</b>
* <p><b>2001/06/22 , marcf</b>:
* <ol>
* <li> Initial import
* </ol>
*/
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