OTP Multiple Supervised Agent Workers

How to have multiple supervised agent processes of the same type in Elixir.

---

in the agent module:

def worker_spec(name) do
  id = "#{__MODULE__}.#{String.capitalize(name)}" |> String.to_atom()
  Supervisor.child_spec({__MODULE__, name: id}, id: id)
end

Important is line 2. This function can dynamically create specs for the supervisor by overriding the :id property. This way, you can have the same module/agent supervised multiple times.

Then use the agent in it’s supervisor module:

def init(_opts) do
  children = [
    MyModule.worker_spec("first"),
    MyModule.worker_spec("second")
  ]
  Supervisor.init(children, strategy: :one_for_one)
end

Important is line 3. This function can dynamically create specs for the supervisor by overriding the :id property. This way, you can have the same module/agent supervised multiple times.