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## org.apache.log4j.spi
Interface HierarchyEventListener

    public interface HierarchyEventListener

Listen to events occurring within a Hierarchy.

Since:
  1.2

Method Summary
`void` | `addAppenderEvent(Category cat, Appender appender)`
`void` | `removeAppenderEvent(Category cat, Appender appender)`

Method Detail

### addAppenderEvent

    void addAppenderEvent(Category cat,
                          Appender appender)

### removeAppenderEvent

    void removeAppenderEvent(Category cat,
                             Appender appender)

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