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NAME
Log::Message::Structured - Simple structured log messages
SYNOPSIS
package MyLogEvent;
use Moose;
use namespace::autoclean;
with qw/
Log::Message::Structured
Log::Message::Structured::Component::Date
Log::Message::Structured::Component::Hostname
Log::Message::Structured::Stringify::AsJSON
/;
has foo => ( is => 'ro', required => 1 );
... elsewhere ...
use aliased 'My::Log::Event';
$logger->log(message => Event->new( foo => "bar" ));
# Logs:
{"__CLASS__":"MyLogEvent","foo":1,"date":"2010-03-28T23:15:52Z","hostname":"mymachine.domain"}
DESCRIPTION
Logging lines to a file is a fairly useful and traditional way of
recording what's going on in your application.
However, if you have another use for the same sort of data (for example,
sending to another process via a message queue, or storing in KiokuDB),
then you can be needlessly repeating your data marshalling.
Log::Message::Structured is a VERY VERY SIMPLE set of roles to help you
make small structured classes which represent '"something which
happened"', that you can then either pass around in your application,
log in a traditional manor as a log line, or serialize to JSON or YAML
for transmission over the network.
COMPONENTS
The consuming class can include components, that will provide additional
attributes. Here is a list of the components included in the basic
distribution. More third party components may be available on CPAN.
* Log::Message::Structured::Component::Date
* Log::Message::Structured::Component::Hostname
* Log::Message::Structured::Component::AttributesFilter
ATTRIBUTES
Except for "class", the basic Log::Message::Structured role provides no
attributes. See available components in
Log::Message::Structured::Component::* and consume them, or create
attributes yourself, to enrich your class
class
Str,ro
An attribute that returns the name of the class that were used when
creating the instance.
METHODS
The only non-accessor methods provided are those composed from
MooseX::Storage related to serialization and deserialization.
as_string
Returns the event as a string. By default, returns an empty string.
However as the class composes stringifier roles, as_string will return
the proper string representation of the event instance.
as_hash
Returns the event as a hash. By default, returns a HashRef with all
attributes, and their values. However, as the class composes modifier
roles, the hash (and thus the string representation) will be changed
accordingly
BUILD
An empty build method (which will be silently discarded if you have one
in your class) is provided, so that additional components can wrap it
(to farce lazy attributes to be built).
REQUIRED METHODS
None.
OVERLOADING
Log::Message::Structured overloads the stringify operator, and return
the result of the "as_string" method.
A note about namespace::autoclean
namespace::autoclean does not work correctly with roles that supply
overloading. Therefore you should instead use:
use namespace::clean -except => 'meta';
instead in all classes using Log::Message::Structured.
SEE ALSO
Log::Message::Structured::Stringify::Sprintf
Log::Message::Structured::Stringify::AsJSON
Log::Message::Structured::Stringify::AsYAML
AUTHOR AND COPYRIGHT
Tomas Doran (t0m) "<bobtfish@bobtfish.net>". Damien Krotkine (dams)
"<dams@cpan.org>".
LICENSE
Licensed under the same terms as perl itself.