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## Package org.apache.log4j.spi

Contains part of the System Programming Interface (SPI) needed to extend log4j.

See:
Description

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 | Deprecated. Replaced by `RootLogger`.
RootLogger | RootLogger sits at the top of the logger hierachy.
ThrowableInformation | ThrowableInformation is log4j's internal representation of throwables.

## Package org.apache.log4j.spi Description

Contains part of the System Programming Interface (SPI) needed to extend log4j.

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