Package org.apache.log4j.spi

Interface Summary

Interface	Description
Component	A common interface shared by log4j components.
Decoder	Allow LoggingEvents to be reconstructed from a different format (usually XML).
LoggerEventListener	Interface used to listen for Logger related events such as add/remove appender or changing levels.
LoggerRepositoryEventListener	Interface used to listen for LoggerRepository related events such as startup, reset, and shutdown.
LoggerRepositoryEx	A LoggerRepository is used to create and retrieve Loggers.
Thresholdable	An interface that defines the required methods for supporting the setting and getting of a level threshold.

Class Summary

Class	Description
ComponentBase	Most log4j components derive from this class.
ErrorItem	Used to store special log4j errors which cannot be logged using internal logging.
Log4JULogger	An implementation of ULogger on org.apache.log4j.Logger.
NOPULogger	A no operation (NOP) implementation of ULogger.
SimpleULogger	A simple implementation that logs messages of level INFO or higher on the console (System.out).