NAME

App::Environ - Simple environment to build applications using service locator pattern

SYNOPSIS

  use App::Environ;

  App::Environ->register( __PACKAGE__,
    initialize   => sub { ... },
    reload       => sub { ... },
    'finalize:r' => sub { ... },
  );

  App::Environ->send_event( 'initialize', qw( foo bar ) );
  App::Environ->send_event('reload');
  App::Environ->send_event( 'pre_finalize:r', sub {...} );
  App::Environ->send_event('finalize:r');

DESCRIPTION

App::Environ is the simple environment to build applications using service locator pattern. Allows register different application components that provide common resources.

METHODS

register( $class, \%handlers )

The method registers handlers for specified events. When some event have been sent, registered event handlers will be processed in order in which they was registered. If you want that event handlers have been processed in reverse order, add postfix :r to event name. All arguments that have been specified in send_event method (see below) are passed to called event handler. If in the last argument is passed the callback, the handler must call it when processing will be done. If the handler was called with callback and some error occurred, the callback must be called with error message in first argument.

  App::Environ->register( __PACKAGE__,
    initialize => sub {
      my @args = @_;

      # handling...
    },
  );

send_event( $event [, @args ] [, $cb->( [ $err ] ) ] )

Sends specified event to App::Environ. All handlers registered for this event will be processed. Arguments specified in send_event method will be passed to event handlers. If the callback is passed in the last argument, event handlers will be processed in asynchronous mode.

  App::Environ->send_event( 'initialize', qw( foo bar ) );

  App::Environ->send_event( 'pre_finalize:r'
    sub {
      my $err = shift;

      if ( defined $err ) {
        # error handling...

        return;
      }

      # success handling...
    }
  );

SEE ALSO

App::Environ::Config

Also see examples from the package to better understand the concept.

AUTHOR

Eugene Ponizovsky, <ponizovsky@gmail.com>

COPYRIGHT AND LICENSE

Copyright (c) 2016-2017, Eugene Ponizovsky, <ponizovsky@gmail.com>. All rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.