Singleton supervisor within an erlang cluster
The package can be installed by adding singleton_supervisor to your list of dependencies in mix.exs:
def deps do
[
{:singleton_supervisor, "~> 0.2.1"}
]
endSingletonSupervisor can be added as a child to a supervision tree but should not be used as the top level application supervisor:
defmodule MyApp.Application do
use Application
def start(_type, _args) do
children = [
{SingletonSupervisor,
strategy: :one_for_one,
name: {:global, MyApp.SingletonSupervisor},
children: [
# Children of SingletonSupervisor
]}
]
opts = [strategy: :one_for_one, name: MyApp.Supervisor]
Supervisor.start_link(children, opts)
end
endSingletonSupervisor by default uses {:global, SingletonSupervisor} as process name and if you
want to use another name make sure you use a distributed registry that takes care of killing
duplicate instances.
SingletonSupervisor can also be used as a module-based supervisor:
defmodule MyApp.SingletonSupervisor do
use Supervisor
def start_link(init_arg) do
SingletonSupervisor.start_link(__MODULE__, init_arg, name: {:global, __MODULE__})
end
def init(_init_arg) do
children = [
# Children of SingletonSupervisor
]
Supervisor.init(children, strategy: :one_for_one)
end
end