Package org.apache.logging.log4j.core.selector

Class ClassLoaderContextSelector

java.lang.Object

org.apache.logging.log4j.core.selector.ClassLoaderContextSelector

All Implemented Interfaces:

ContextSelector

Direct Known Subclasses:

AsyncLoggerContextSelector, BundleContextSelector

public class ClassLoaderContextSelector
extends Object
implements ContextSelector

This ContextSelector chooses a LoggerContext based upon the ClassLoader of the caller. This allows Loggers assigned to static variables to be released along with the classes that own then. Other ContextSelectors will generally cause Loggers associated with classes loaded from different ClassLoaders to be co-mingled. This is a problem if, for example, a web application is undeployed as some of the Loggers being released may be associated with a Class in a parent ClassLoader, which will generally have negative consequences. The main downside to this ContextSelector is that Configuration is more challenging. This ContextSelector should not be used with a Servlet Filter such as the Log4jServletFilter.

Field Summary

Fields

Modifier and Type	Field	Description
protected static ConcurrentMap<String,AtomicReference<WeakReference<LoggerContext>>>	CONTEXT_MAP
protected static StatusLogger	LOGGER

Constructor Summary

Constructors

Constructor	Description
ClassLoaderContextSelector()

Method Summary

Modifier and Type	Method	Description
protected LoggerContext	createContext(String name, URI configLocation)
protected String	defaultContextName()
LoggerContext	getContext(String fqcn, ClassLoader loader, boolean currentContext)	Returns the LoggerContext.
LoggerContext	getContext(String fqcn, ClassLoader loader, boolean currentContext, URI configLocation)	Returns the LoggerContext.
protected LoggerContext	getDefault()
List<LoggerContext>	getLoggerContexts()	Returns a List of all the available LoggerContexts.
void	removeContext(LoggerContext context)	Remove any references to the LoggerContext.
protected String	toContextMapKey(ClassLoader loader)

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

protected static final StatusLogger LOGGER

CONTEXT_MAP

protected static final ConcurrentMap<String,AtomicReference<WeakReference<LoggerContext>>> CONTEXT_MAP

Constructor Detail

ClassLoaderContextSelector

public ClassLoaderContextSelector()

Method Detail

getContext

public LoggerContext getContext(String fqcn,
                                ClassLoader loader,
                                boolean currentContext)

Description copied from interface: ContextSelector

Returns the LoggerContext.

Specified by:

getContext in interface ContextSelector

Parameters:

fqcn - The fully qualified class name of the caller.

loader - ClassLoader to use or null.

currentContext - If true returns the current Context, if false returns the Context appropriate for the caller if a more appropriate Context can be determined.

Returns:

The LoggerContext.

getContext

public LoggerContext getContext(String fqcn,
                                ClassLoader loader,
                                boolean currentContext,
                                URI configLocation)

Description copied from interface: ContextSelector

Returns the LoggerContext.

Specified by:

getContext in interface ContextSelector

Parameters:

fqcn - The fully qualified class name of the caller.

loader - ClassLoader to use or null.

currentContext - If true returns the current Context, if false returns the Context appropriate for the caller if a more appropriate Context can be determined.

configLocation - The location of the configuration for the LoggerContext.

Returns:

The LoggerContext.

removeContext

public void removeContext(LoggerContext context)

Description copied from interface: ContextSelector

Remove any references to the LoggerContext.

Specified by:

removeContext in interface ContextSelector

Parameters:

context - The context to remove.

getLoggerContexts

public List<LoggerContext> getLoggerContexts()

Description copied from interface: ContextSelector

Returns a List of all the available LoggerContexts.

Specified by:

getLoggerContexts in interface ContextSelector

Returns:

The List of LoggerContexts.

createContext

protected LoggerContext createContext(String name,
                                      URI configLocation)

toContextMapKey

protected String toContextMapKey(ClassLoader loader)

getDefault

protected LoggerContext getDefault()

defaultContextName

protected String defaultContextName()