Package org.apache.log4j.spi

Interface Summary
AppenderAttachable	Interface for attaching appenders to objects.
Configurator	Implemented by classes capable of configuring log4j using a URL.
ErrorCode	This interface defines commonly encoutered error codes.
ErrorHandler	Appenders may delegate their error handling to ErrorHandlers.
HierarchyEventListener	Listen to events occuring within a Hierarchy.
LoggerFactory	Implement this interface to create new instances of Logger or a sub-class of Logger.
LoggerRepository	A LoggerRepository is used to create and retrieve Loggers.
OptionHandler	A string based interface to configure package components.
RendererSupport
RepositorySelector	The LogManager uses one (and only one) RepositorySelector implementation to select the LoggerRepository for a particular application context.
TriggeringEventEvaluator	Implementions of this interface allow certain appenders to decide when to perform an appender specific action.

Class Summary
DefaultRepositorySelector
Filter	Users should extend this class to implement customized logging event filtering.
LocationInfo	The internal representation of caller location information.
LoggingEvent	The internal representation of logging events.
NOPLogger	No-operation implementation of Logger used by NOPLoggerRepository.
NOPLoggerRepository	No-operation implementation of LoggerRepository which is used when LogManager.repositorySelector is erroneously nulled during class reloading.
RootCategory
RootLogger	RootLogger sits at the top of the logger hierachy.
ThrowableInformation	ThrowableInformation is log4j's internal representation of throwables.