layouts | R Documentation |
In log4j etymology, Layouts are how Appenders control the format of messages.
Some general-purpose layouts are described below.
For implementing your own layouts, see Details.
default_log_layout(time_format = "%Y-%m-%d %H:%M:%S") simple_log_layout() bare_log_layout() logfmt_log_layout() json_log_layout()
time_format |
A valid format string for timestamps. See
|
Layouts are implemented as functions with the interface
function(level, ...)
and returning a single string.
json_log_layout
requires the jsonlite
package.
# The behaviour of a layout can be seen by using them directly: simple <- simple_log_layout() simple("INFO", "Input has length ", 0, ".") with_timestamp <- default_log_layout() with_timestamp("INFO", "Input has length ", 0, ".")
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