In log4j etymology, Appenders are destinations where messages are written. Depending on the nature of the destination, the format of the messages may be controlled using a Layout.
The most basic appenders log messages to the console or to a file; these are described below.
For implementing your own appenders, see Details.
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A layout function taking a
The file to write messages to.
Appenders are implemented as functions with the interface
function(level, ...). These functions are expected to write their
arguments to a destination and return
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# The behaviour of an appender can be seen by using them directly; the # following snippet will write the message to the console. appender <- console_appender() appender("INFO", "Input has length ", 0, ".")
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