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Journey is a library for defining and running durable workflows with persistence, reliability, and scalability.
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lib/examples/useless_machine.ex
defmodule UselessMachine do
import Journey.Node
@moduledoc """
This module ([lib/examples/useless_machines.ex](https://github.com/markmark206/journey/blob/main/lib/examples/useless_machine.ex)) contains an example of building a Useless Machine using Journey.
Here is an example of running the useless Machine:
```elixir
iex> graph = UselessMachine.graph()
iex> execution = Journey.start_execution(graph)
iex> Journey.get_value(execution, :switch)
{:error, :not_set}
iex> Journey.get_value(execution, :paw)
{:error, :not_set}
iex> Journey.set(execution, :switch, "on")
iex> # updating switch triggers :paw
iex> Journey.get_value(execution, :paw, wait_any: true)
{:ok, "updated :switch"}
iex> # :paw set switch back to "off"
iex> Journey.get_value(execution, :switch, wait_any: true)
{:ok, "off"}
```
"""
@doc """
This function defines the graph for the Useless Machine.
It starts with a switch input and mutates the state to "off" when the switch
is toggled, simulating the behavior of a Useless Machine.
"""
def graph() do
Journey.new_graph(
"useless machine example graph",
"v1.0.0",
[
input(:switch),
mutate(:paw, [:switch], &lol_no/1, mutates: :switch)
]
)
end
@doc """
This function simulates the paw's response when the switch is toggled.
It prints a message and mutates the state of the :switch node to "off".
"""
def lol_no(%{switch: switch}) do
IO.puts("paw says: '#{switch}? lol no'")
{:ok, "off"}
end
end