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Courier::Filter::Logger(3pm) User Contributed Perl Documentation Courier::Filter::Logger(3pm)


Courier::Filter::Logger - Abstract base class for loggers used by the Courier::Filter framework


Courier::Filter logging

    use Courier::Filter::Logger::My;  # Need to use a non-abstract sub-class.
    my $logger = Courier::Filter::Logger::My->new(%options);
    # For use in an individual filter module:
    my $module = Courier::Filter::Module::My->new(
        logger => $logger,
    # For use as a global Courier::Filter logger object:
    my $filter = Courier::Filter->new(
        logger => $logger,

Deriving new logger classes

    package Courier::Filter::Logger::My;
    use base qw(Courier::Filter::Logger);


Sub-classes of Courier::Filter::Logger are used by the Courier::Filter mail filtering framework and its filter modules for the logging of errors and message rejections to arbitrary targets, like file handles or databases.

When overriding a method in a derived class, do not forget calling the inherited method from your overridden method.


The following constructor is provided and may be overridden:

Creates a new logger using the %options given as a list of key/value pairs. Initializes the logger, by creating/opening I/O handles, connecting to databases, etc..

"Courier::Filter::Logger::new()" creates a hash-ref as an object of the invoked class, and stores the %options in it, but does nothing else.


The following destructor is provided and may be overridden:

Uninitializes the logger, by closing I/O handles, disconnecting from databases, etc..

"Courier::Filter::Logger::destroy()" does nothing. Sub-classes may override this method and define clean-up behavior.

Instance methods

The following instance methods are provided and may be overridden:

Logs the error message given as $text (a string which may contain newlines).

"Courier::Filter::Logger::log_error()" does nothing and should be overridden.

Logs the Courier::Message given as $message as having been rejected due to $reason (a string which may contain newlines).

"Courier::Filter::Logger::log_rejected_message()" does nothing and should be overridden.


Courier::Filter, Courier::Filter::Module.

For a list of prepared loggers that come with Courier::Filter, see "Bundled Courier::Filter loggers" in Courier::Filter::Overview.

For AVAILABILITY, SUPPORT, and LICENSE information, see Courier::Filter::Overview.


Julian Mehnle <>

2022-10-21 perl v5.34.0