Logging is performed through JavaBeans events. To log a message, a component creates a LogEvent
that includes the message, then broadcasts the event. Events are received by LogListener
objects that handle the logging events in various ways. Some LogListener
objects write events to a log file, some send email, some dispatch events to multiple listeners. The separation between log source and log listener allows for a flexible logging configuration that can be tailored to individual applications.
A LogListener
can be either a LogEvent
sink (performs a final action) or a LogEvent
filter (sends an event to other LogListeners
). The following sections describe how to implement log events: