ALL OUR NOTIFIER CLASS NEEDS TO KNOW IS IT NEEDS SOMETHING ON WHICH IT HAS TO CALL THE SEND METHOD.
{d7.info}
{d7.module}
{d8_demo.module}
{d8_demo.routing.yml}
Drupal/<module_name>/Controller to keep all the Controllers related to <module_name> grouped in the same place.
_access: 'TRUE'
_user_is_logged_in: 'TRUE'
_permission: 'my permission name'
_role: 'role1+role2' (AND)
_role: 'role1, role2' (OR)
{d7_demo.module}
Drupal 8
$items['node/%nid']
{d7_demo.module}
{d8DemoController.php}
{d8_demo.routing.yml}
variable_set()
variable_get()
Module/hook system functions replaced with module handler service(https://drupal.org/node/1894902)