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=== Usage === To use GenStatem, developers need to define a module that implements the behavior defined by GenStatem. This module must define a set of callbacks that handle state transitions, events, and other behavior specific to the state machine. An example of a module implementing the GenStatem behavior: ```elixir defmodule MyStateMachine do use GenStatem def init(:my_init_state, _args) do {:ok, :my_init_state} end def state_handle_event(:my_init_state, :my_event, data) do # Handle the event in the 'my_init_state' state {:next_state, :my_next_state, data} end def state_handle_event(:my_next_state, :my_event, data) do # Handle the event in the 'my_next_state' state {:next_state, :my_next_state, data} end end ``` This example defines a simple state machine with two states: `:my_init_state` and `:my_next_state`. The `init/2` callback initializes the state machine by returning the initial state. The `state_handle_event/3` callbacks define how events are handled in each state. To start the state machine, the `GenStatem.start_link/3` function is used: ```elixir GenStatem.start_link(__MODULE__, :my_init_state, []) ```
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