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Bread::Board::Container(3) User Contributed Perl Documentation Bread::Board::Container(3)

Bread::Board::Container - A container for services and other containers

version 0.37

  use Bread::Board;
  my $c = container MCP => as {
      container Users => as {
          service flynn => ...;
          service bradley => ...;
          service dillinger => ...;
      };

      container Programs => as {
          container Rebels => as {
              service tron => ...;
              service yori => ...;
              alias flynn => '/Users/flynn';
          };

          # nested container
          container Slaves => as {
              service sark => ...;
              service crom => ...;
          };
      };
  };

  # OR directly...
  my $guardians => Bread::Board::Container->new( name => 'Guardians' );
  $guardians->add_service(
      Bread::Board::ConstructorInjection->new(
          name => 'dumont',
          ...,
      )
  );
  $c->get_sub_container('Programs')->add_sub_container($guardians);

This class implements the container for Bread::Board: a container is a thing that contains services and other containers. Each container and service has a name, so you end up with a tree of named nodes, just like files and directories in a filesystem: each item can be referenced using a path (see Bread::Board::Traversable for the details).

Read/write string, required. Every container needs a name, by which it can be referenced when fetching it.

Hashref, constrained by "Bread::Board::Container::ServiceList", mapping names to services directly contained in this container. Every service added here will have its "parent" set to this container.

You can pass an arrayref of services instead of a hashref, the keys will be the names of the services.

You should probably use "add_service" and "get_service" to manipulate this attribute, instead of modifying it directly.

Hashref, constrained by "Bread::Board::Container::SubContainerList", mapping names to containers directly contained in this container. Every container added here will have its "parent" set to this container.

You can pass an arrayref of containers instead of a hashref, the keys will be the names of the containers.

You should probably use "add_sub_container" and "get_sub_container" to manipulate this attribute, instead of modifying it directly.

Containers added here can either be normal Bread::Board::Container or Bread::Board::Container::Parameterized.

  $container->add_service($service);

Adds a service into the "services" map, using its name as the key.

  my $service = $container->get_service($name);

Returns a service by name, or "undef" if there's no such service in the "services" map.

  if ($container->has_service($name)) { ... }

Returns true if a service with the given name name exists in the "services" map, false otherwise.

  if ($container->has_services) { ... }

Returns true if the "services" map contains any services, false if it's empty.

  my @service_names = $container->get_service_list();

Returns the names off all services present in the "services" map.

  $container->add_sub_container($container);

Adds a container into the "sub_containers" map, using its name as the key.

  my $container = $container->get_sub_container($name);

Returns a container by name, or "undef" if there's no such container in the "sub_containers" map.

  if ($container->has_sub_container($name)) { ... }

Returns true if a container with the given name name exists in the "sub_containers" map, false otherwise.

  if ($container->has_sub_containers) { ... }

Returns true if the "sub_containers" map contains any contains, false if it's empty.

  my @container_names = $container->get_sub_container_list();

Returns the names off all containers present in the "sub_containers" map.

  $containers->add_type_mapping_for( $type_name, $service );

Adds a mapping from a Moose type to a service: whenever we try to "resolve" that type, we'll use that service to instantiate it.

  my $service = $container->get_type_mapping_for( $type_name );

Returns the service to use to instantiate the given type name.

Important: if a mapping for the exact type can't be found, but a mapping for a subtype of it can, you'll get the latter instead:

  package Superclass { use Moose };
  package Subclass { use Moose; exends 'Superclass' };

  $c->add_type_mapping_for(
   'Subclass',
   Bread::Board::ConstructorInjection->new(name=>'sc',class=>'Subclass'),
 );
 my $o = $c->get_type_mapping_for('Superclass')->get;

$o is an instance of "Subclass". If there are more than one sub-type mapped, you get a random one. This is probably a bad idea.

  if ($container->has_type_mapping_for( $type_name )) { ... }

Returns true if we have a service defined to instantiate the given type name, but see the note on "get_type_mapping_for" about subtype mapping.

  my $object = $container->resolve(service=>$service_name);
  my $object = $container->resolve(service=>$service_name,parameters=>\%p);

When given a service name, this method will fetch the service, then call "get" on it, optionally passing the given parameters.

  my $object = $container->resolve(type=>$type);
  my $object = $container->resolve(type=>$type,parameters=>\%p);

When given a type name, this method will use "get_type_mapping_for" to get the service, then call "get" on it, optionally passing the given parameters. If the instance is not of the expected type, the method will die.

Stevan Little <stevan@iinteractive.com>

Please report any bugs or feature requests on the bugtracker website https://github.com/stevan/BreadBoard/issues

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

This software is copyright (c) 2019, 2017, 2016, 2015, 2014, 2013, 2011, 2009 by Infinity Interactive.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

2019-06-28 perl v5.32.1

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