Abstract classes are exported for package developers that want to extend them, they cannot be instantiated directly.
Superclass for classes that have a filter() method such as Appenders and
Loggers. This class is only exported for package developers that want to
extend it.
Filterable.obj()
An object of class R6ClassGenerator of length 24.
filters, set_filters(filters)a list that may contain
functions or any R object with a filter() method. These functions
must have exactly one argument: event which will get passed the
LogEvent when the Filterable's filter() method is invoked.
If all of these functions evaluate to TRUE the LogEvent is passed on.
Since LogEvents have reference semantics, filters can also be abused to
modify them before they are passed on. Look at the source code of
with_log_level() or with_log_value() for examples.
filter(event)Determine whether the LogEvent x should be passed
on to Appenders (TRUE) or not (FALSE). See also the active binding
filters
add_filter(filter, name = NULL), remove_filter(pos)Add or remove a filter. When adding a filter an optional name can
be specified. remove_filter() can remove by position or name (if one
was specified)
Other abstract classes: AppenderDigest,
AppenderMail, AppenderMemory,
AppenderTable