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## Package org.apache.logging.log4j.spi

Internal interfaces and classes to be used by authors of logging implementations or for internal use by API classes.

See:
Description

Interface Summary
ExtendedLogger | Extends the `Logger` interface with methods that facilitate implementing or extending `Logger`s.
LoggerAdapter<L> | A basic registry for `LoggerContext` objects and their associated external Logger classes.
LoggerContext | Anchor point for logging implementations.
LoggerContextFactory | Implemented by factories that create `LoggerContext` objects.
ThreadContextMap | Service provider interface to implement custom MDC behavior for `ThreadContext`.
ThreadContextStack | Service provider interface to implement custom NDC behavior for `ThreadContext`.

Class Summary
AbstractLogger | Base implementation of a Logger.
AbstractLoggerAdapter<L> | Provides an abstract base class to use for implementing LoggerAdapter.
DefaultThreadContextMap | The actual ThreadContext Map.
DefaultThreadContextStack | A copy-on-write thread-safe variant of `org.apache.logging.log4j.spi.ThreadContextStack` in which all mutative operations (add, pop, and so on) are implemented by making a fresh copy of the underlying list.
ExtendedLoggerWrapper | Wrapper class that exposes the protected AbstractLogger methods to support wrapped loggers.
MutableThreadContextStack |
Provider | Model class for a Log4j 2 provider.

Enum Summary
StandardLevel | Standard Logging Levels as an enumeration for use internally.

## Package org.apache.logging.log4j.spi Description

Internal interfaces and classes to be used by authors of logging implementations or for internal use by API classes.

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