NAME
Deeme - a Database-agnostic driven Event Emitter
SYNOPSIS
package Cat;
use Mojo::Base 'Deeme';
use Deeme::Backend::Meerkat;
# app1.pl
package main;
# Subscribe to events in an application (thread, fork, whatever)
my $tiger = Cat->new(backend=> Deeme::Backend::Meerkat->new(...) ); #or you can just do Deeme->new
$tiger->on(roar => sub {
my ($tiger, $times) = @_;
say 'RAWR!' for 1 .. $times;
});
...
#then, later in another application
# app2.pl
my $tiger = Cat->new(backend=> Deeme::Backend::Meerkat->new(...));
$tiger->emit(roar => 3);DESCRIPTION
Deeme is a database-agnostic driven event emitter base-class. Deeme allows you to define binding subs on different points in multiple applications, and execute them later, in another worker. It is handy if you have to attach subs to events that are delayed in time and must be fixed. It is strongly inspired by (and a rework of) Mojo::EventEmitter.
EVENTS
Deeme can emit the following events.
error
$e->on(error => sub {
my ($e, $err) = @_;
...
});Emitted for event errors, fatal if unhandled.
$e->on(error => sub {
my ($e, $err) = @_;
say "This looks bad: $err";
});METHODS
Deeme inherits all methods from Mojo::Base and implements the following new ones.
catch
$e = $e->catch(sub {...});Subscribe to "error" event.
# Longer version
$e->on(error => sub {...});emit
$e = $e->emit('foo');
$e = $e->emit('foo', 123);Emit event.
reset
$e = $e->reset;Delete all events on the backend.
emit_safe
$e = $e->emit_safe('foo');
$e = $e->emit_safe('foo', 123);Emit event safely and emit "error" event on failure.
has_subscribers
my $bool = $e->has_subscribers('foo');Check if event has subscribers.
on
my $cb = $e->on(foo => sub {...});Subscribe to event.
$e->on(foo => sub {
my ($e, @args) = @_;
...
});once
my $cb = $e->once(foo => sub {...});Subscribe to event and unsubscribe again after it has been emitted once.
$e->once(foo => sub {
my ($e, @args) = @_;
...
});subscribers
my $subscribers = $e->subscribers('foo');All subscribers for event.
# Unsubscribe last subscriber
$e->unsubscribe(foo => $e->subscribers('foo')->[-1]);unsubscribe
$e = $e->unsubscribe('foo');
$e = $e->unsubscribe(foo => $cb);Unsubscribe from event.
DEBUGGING
You can set the DEEME_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.
DEEME_DEBUG=1AUTHOR
mudler <mudler@dark-lab.net>
COPYRIGHT
Copyright 2014- mudler
LICENSE
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
Deeme::Backend::Memory, Deeme::Backend::Mango, Deeme::Backend::Meerkat, Mojo::EventEmitter, Mojolicious