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Bread::Board::Service::WithParameters(3pm) User Contributed Perl Documentation Bread::Board::Service::WithParameters(3pm)


Bread::Board::Service::WithParameters - Services with parameters


version 0.37


This is a sub-role of Bread::Board::Service, for parameterized services. These are services that will instantiate different values depending on parameters that are passed to the "get" method. You can pass those parameters via the "service_params" attribute of "Bread::Board::Dependency", or via the "inflate" method of "Bread::Board::Service::Deferred::Thunk".



Read-only hashref, will be passed as-is to "MooseX::Params::Validate"'s "validated_hash", so you can use things like "optional" and "default" in addition to type constraints:

  service something => (
    class => 'Thing',
    parameters => {
       type => { isa => 'Str', default => 'text' },

This attribute uses coercions on "Bread::Board::Service::Parameters" so that you can also say:

  service something => (
    class => 'Thing',
    parameters => ['type'],

and it will be equivalent to:

  service something => (
    class => 'Thing',
    parameters => {
       type => { optional => 0 },



Predicate for the "parameters" attribute.


Returns true if any of the "parameters" have a "default" value.


Returns true if any of the "parameters" does not have "optional" set to true.


  my %parameters = $service->check_parameters(name1=>$value1,name2=>$value2);
  my %parameters = $service->check_parameters({name1=>$value1,name2=>$value2});

If any "parameters" are defined, this function validates its arguments against the parameters' definitions (using MooseX::Params::Validate). It will die if the validation fails, or return the validated parameters (including default value) if it succeeds.


Before the "get" method, arguments to "get" are passed through "check_parameters" and added to the "params" hashref. After the "get" method, those keys/values will be removed. In practice, this makes all parameters available to the actual "get" method body.


Stevan Little <>


Please report any bugs or feature requests on the bugtracker website

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.

2020-04-01 perl v5.30.0