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UnifiedClassLoader4 (JBoss/JMX API) - JBoss 3.2.7 jmx API Documentation 英文版文档

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org.jboss.mx.loading
Class UnifiedClassLoader4

java.lang.Object
  java.lang.ClassLoader
      java.security.SecureClassLoader
          java.net.URLClassLoader
              org.jboss.mx.loading.UnifiedClassLoader
                  org.jboss.mx.loading.UnifiedClassLoader4

All Implemented Interfaces:

org.jboss.util.loading.Translatable, UnifiedClassLoader3MBean, UnifiedClassLoaderMBean

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public class UnifiedClassLoader4

extends UnifiedClassLoader

implements UnifiedClassLoader3MBean

An extension of UnifiedClassLoader that manages a thread based loading strategy to work around the locking problems associated with the VM initiated locking due to the synchronized loadClassInternal method of ClassLoader which cannot be overriden.

Version:

$Revision: 1.1.2.2 $

Author:

Scott Stark

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Field Summary
protected  EDU.oswego.cs.dl.util.concurrent.ReentrantLock	loadLock

 

Fields inherited from class org.jboss.mx.loading.UnifiedClassLoader

origURL, repository, unregisterTrace, url

 

Constructor Summary

UnifiedClassLoader4(URL url)           Construct a UnifiedClassLoader without registering it to the classloader repository.

UnifiedClassLoader4(URL url, URL origURL)           Construct a UnifiedClassLoader without registering it to the classloader repository.

UnifiedClassLoader4(URL url, URL origURL, ClassLoader parent, LoaderRepository repository)           Construct a UnifiedClassLoader and associate it with the given repository.

UnifiedClassLoader4(URL url, URL origURL, LoaderRepository repository)           Construct a UnifiedClassLoader and associate it with the given repository.

 

Method Summary
protected  void	acquire()           Acquire the class loading lock.
protected  boolean	attempt(long waitMS)           Attempt to acquire the class loading lock.
int	getAddedOrder()
URL	getResource(String name)           Load the resource from the repository using the LoadMgr as the synchronization point.
Class	loadClass(String name, boolean resolve)           Called to load a class into the repository.
protected  void	release()           Release the class loading lock previous acquired through the acquire method.
void	setAddedOrder(int addedOrder)
String	toString()           Retruns a string representaion of this UCL.
void	unregister()

 

Methods inherited from class org.jboss.mx.loading.UnifiedClassLoader

addURL, clearBlacklists, definePackage, equals, findClass, findResources, findResourcesLocally, getAllURLs, getClasspath, getLoaderRepository, getObjectName, getOrigURL, getPackage, getPackages, getPermissions, getProtectionDomain, getProtectionDomain, getResourceLocally, getURL, getURLs, hashCode, loadByteCode, loadClassLocally, setRepository

 

Methods inherited from class java.net.URLClassLoader

definePackage, findResource, newInstance, newInstance

 

Methods inherited from class java.security.SecureClassLoader

defineClass

 

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getParent, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Field Detail

loadLock

protected EDU.oswego.cs.dl.util.concurrent.ReentrantLock loadLock

Constructor Detail

UnifiedClassLoader4

public UnifiedClassLoader4(URL url)

Construct a UnifiedClassLoader without registering it to the classloader repository.

Parameters:

url - the single URL to load classes from.

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UnifiedClassLoader4

public UnifiedClassLoader4(URL url,
                           URL origURL)

Construct a UnifiedClassLoader without registering it to the classloader repository.

Parameters:

url - the single URL to load classes from.

origURL - the possibly null original URL from which url may be a local copy or nested jar.

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UnifiedClassLoader4

public UnifiedClassLoader4(URL url,
                           URL origURL,
                           LoaderRepository repository)

Construct a UnifiedClassLoader and associate it with the given repository.

Parameters:

url - The single URL to load classes from.

origURL - the possibly null original URL from which url may be a local copy or nested jar.

repository - the repository this classloader delegates to

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UnifiedClassLoader4

public UnifiedClassLoader4(URL url,
                           URL origURL,
                           ClassLoader parent,
                           LoaderRepository repository)

Construct a UnifiedClassLoader and associate it with the given repository.

Parameters:

url - The single URL to load classes from.

origURL - the possibly null original URL from which url may be a local copy or nested jar.

parent - the parent class loader to use

repository - the repository this classloader delegates to

Method Detail

unregister

public void unregister()

Overrides:

unregister in class UnifiedClassLoader

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getAddedOrder

public int getAddedOrder()

Overrides:

getAddedOrder in class UnifiedClassLoader

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setAddedOrder

public void setAddedOrder(int addedOrder)

Overrides:

setAddedOrder in class UnifiedClassLoader

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toString

public String toString()

Retruns a string representaion of this UCL.

Overrides:

toString in class UnifiedClassLoader

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loadClass

public Class loadClass(String name,
                       boolean resolve)
                throws ClassNotFoundException

Called to load a class into the repository. The calling thread owns the UCL monitor and handles class loadings tasks for which this UCL is likely to be able to handle based on the pkg to URL mapping in the repository.

Overrides:

loadClass in class UnifiedClassLoader

Throws:

ClassNotFoundException

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getResource

public URL getResource(String name)

Load the resource from the repository using the LoadMgr as the synchronization point.

Overrides:

getResource in class UnifiedClassLoader

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attempt

protected boolean attempt(long waitMS)

Attempt to acquire the class loading lock. This lock must be acquired before a thread enters the class loading task loop in loadClass. This method maintains any interrupted state of the calling thread.

See Also:

loadClass(String, boolean)

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acquire

protected void acquire()

Acquire the class loading lock. This lock must be acquired before a thread enters the class loading task loop in loadClass.

See Also:

loadClass(String, boolean)

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release

protected void release()

Release the class loading lock previous acquired through the acquire method.

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