#! /usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

{   package My::Task::Runner;
    use Moo;
    has tasks => (is => 'ro');
    sub run_tasks {
        $_->run for @{ shift->tasks };
    }
}

{   package My::Task;
    use Moo::Role;
    requires 'run';
    has name => (is => 'ro', required => 1);
}

{   package My::Task1;
    use Moo;
    with 'My::Task';
    sub run {
        say "Running: ", shift->name;
    }
}

{   package My::Task2;
    use Moo;
    with 'My::Task';
    has mode => (is => 'ro');
    sub run {
        my ($self) = @_;
        say "Running: ", $self->name, ' in ', $self->mode, ' mode.';
    }
}

my $runner = 'My::Task::Runner'->new(
    tasks => [ 'My::Task1'->new(name => 'One'),
               'My::Task2'->new(name => 'Two', mode => 'LOUD'),
    ],
);
$runner->run_tasks;
[download]