system_registry v0.6.1 SystemRegistry.Task
Creates a process that executes a function anytime the contents of a given system_registry scope change.
For example, to perform an operation every time that the IPv4 address changes on “wlan0”, do this:
worker(SystemRegistry.Task, [
[:state, :network_interface, "wlan0", :ipv4_address],
fn({_old, _new}) ->
# Do something
end])
This technique should be used sparingly and only for performing simple side effects to state change.
Link to this section Summary
Functions
Starts a task as part of a supervision tree
Link to this section Functions
Link to this function
start_link(scope, fun, opts \\ [])
start_link(SystemRegistry.scope(), (() -> any()), [term()]) :: {:ok, pid()}
Starts a task as part of a supervision tree.