Lesson 05 Livebook: Hire A CTO

This notebook focuses on the ownership boundary from lesson 5: the CEO gets a summary, while the CTO keeps the real technical plan.

Mix.install([
  {:hire_engineer_and_build, path: "../05_hire_a_cto"}
])

Application.ensure_all_started(:hire_engineer_and_build)

Helpers

defmodule Lesson05Helpers do
  alias HireEngineerAndBuild.StudioJido

  def unique_agent_id(prefix) do
    "#{prefix}-#{System.unique_integer([:positive])}"
  end

  def wait_until(fun, attempts \\ 20)

  def wait_until(fun, attempts) when attempts > 0 do
    case fun.() do
      nil ->
        Process.sleep(50)
        wait_until(fun, attempts - 1)

      value ->
        value
    end
  end

  def wait_until(_fun, 0) do
    raise "condition was not met before the timeout"
  end

  def safe_stop_family(parent_id) do
    child_ids = ["#{parent_id}/cto"]

    Enum.each(child_ids, fn child_id ->
      case StudioJido.whereis(child_id) do
        nil -> :ok
        _pid -> StudioJido.stop_agent(child_id)
      end
    end)

    case StudioJido.whereis(parent_id) do
      nil -> :ok
      _pid -> StudioJido.stop_agent(parent_id)
    end
  end
end

Ask The CTO For Strategy

alias HireEngineerAndBuild.{CEOAgent, StudioJido}
alias Jido.AgentServer
alias Jido.Signal

ceo_id = Lesson05Helpers.unique_agent_id("ceo")
{:ok, ceo_pid} = StudioJido.start_agent(CEOAgent, id: ceo_id)

{:ok, _ceo} =
  AgentServer.call(
    ceo_pid,
    Signal.new!("studio.technical_leadership_requested", %{}, source: "/ceo")
  )

ceo_state =
  Lesson05Helpers.wait_until(fn ->
    {:ok, state} = AgentServer.state(ceo_pid)

    if Map.has_key?(state.children, :cto) do
      state
    end
  end)

cto_pid = ceo_state.children.cto.pid

{:ok, _cto} =
  AgentServer.call(
    cto_pid,
    Signal.new!(
      "cto.technical_strategy_requested",
      %{milestone: "vertical slice", product_goal: "make combat feel responsive"},
      source: "/ceo"
    )
  )

updated_ceo_state =
  Lesson05Helpers.wait_until(fn ->
    {:ok, state} = AgentServer.state(ceo_pid)

    if state.agent.state.executive_updates != [] do
      state
    end
  end)

{:ok, cto_state} = AgentServer.state(cto_pid)

Lesson05Helpers.safe_stop_family(ceo_id)

%{
  ceo_view: updated_ceo_state.agent.state.executive_updates,
  cto_roadmap: cto_state.agent.state.technical_roadmap,
  cto_hiring_intent: cto_state.agent.state.hiring_intent
}