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=1

AUTHOR
    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