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ContextClassLoaderSwitcher (JBoss/Common API) - JBoss 4.0.1 sp1 common API Documentation 英文版文档

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org.jboss.util.loading
Class ContextClassLoaderSwitcher

java.lang.Object
  org.jboss.util.loading.ContextClassLoader
      org.jboss.util.loading.ContextClassLoaderSwitcher

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public class ContextClassLoaderSwitcher

extends ContextClassLoader

A helper for context classloading switching.

When a security manager is installed, the constructor checks for the runtime permissions "getClassLoader" and "setContextClassLoader". This allows the methods of this class to be used later without having to run in privileged blocks. There are optimized methods to perform the operations within a switch context. This avoids retrieving the current thread on every operation.

Version:

$Revision: 1.4 $

Author:

Adrian Brock

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Nested Class Summary
class	ContextClassLoaderSwitcher.SwitchContext           A helper class to remember the original classloader and avoid continually retrieveing the current thread.

 

Field Summary
static org.jboss.util.loading.ContextClassLoaderSwitcher.NewInstance	INSTANTIATOR           Instantiate a new context class loader switcher
static RuntimePermission	SETCONTEXTCLASSLOADER           Set the context classloader permission

 

Fields inherited from class org.jboss.util.loading.ContextClassLoader

GETCLASSLOADER

 

Method Summary
ContextClassLoaderSwitcher.SwitchContext	getSwitchContext()           Retrieve a switch context
ContextClassLoaderSwitcher.SwitchContext	getSwitchContext(Class clazz)           Deprecated. using a class to determine the classloader is a bad idea, it has the same problems as Class.forName()
ContextClassLoaderSwitcher.SwitchContext	getSwitchContext(ClassLoader cl)           Retrieve a switch context and set the new context classloader
void	setContextClassLoader(ClassLoader cl)           Set the context classloader
void	setContextClassLoader(Thread thread, ClassLoader cl)           Set the context classloader for the given thread

 

Methods inherited from class org.jboss.util.loading.ContextClassLoader

getContextClassLoader, getContextClassLoader

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

SETCONTEXTCLASSLOADER

public static final RuntimePermission SETCONTEXTCLASSLOADER

Set the context classloader permission

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INSTANTIATOR

public static final org.jboss.util.loading.ContextClassLoaderSwitcher.NewInstance INSTANTIATOR

Instantiate a new context class loader switcher

Method Detail

setContextClassLoader

public void setContextClassLoader(ClassLoader cl)

Set the context classloader

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setContextClassLoader

public void setContextClassLoader(Thread thread,
                                  ClassLoader cl)

Set the context classloader for the given thread

Parameters:

thread - the thread

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getSwitchContext

public ContextClassLoaderSwitcher.SwitchContext getSwitchContext()

Retrieve a switch context

Returns:

the switch context

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getSwitchContext

public ContextClassLoaderSwitcher.SwitchContext getSwitchContext(ClassLoader cl)

Retrieve a switch context and set the new context classloader

Parameters:

cl - the new classloader

Returns:

the switch context

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getSwitchContext

public ContextClassLoaderSwitcher.SwitchContext getSwitchContext(Class clazz)

Deprecated. using a class to determine the classloader is a bad idea, it has the same problems as Class.forName()

Retrieve a switch context for the classloader of a given class

Parameters:

clazz - the class whose classloader should be set as the context classloader

Returns:

the switch context

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