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| defmodule MessageRouter.DSL do | |
| alias MessageRouter.Route | |
| alias MessageRouter.QueueHandler | |
| alias MessageRouter.Supervisor | |
| defmacro __using__(_args) do | |
| quote do | |
| import MessageRouter.DSL | |
| Module.register_attribute(__MODULE__, :routes, accumulate: true) | |
| Module.register_attribute(__MODULE__, :queue_handlers, accumulate: true) | |
| def routes do | |
| @routes |> Enum.group_by(&(&1.queue)) | |
| end | |
| def queue_handlers do | |
| @queue_handlers | |
| end | |
| end | |
| end | |
| defmacro route(options) do | |
| key = Keyword.fetch!(options, :key) | |
| queue = Keyword.fetch!(options, :to) | |
| route = %Route{key: key, queue: queue} | |
| quote do | |
| Module.put_attribute __MODULE__, :routes, unquote(Macro.escape(route)) | |
| end | |
| end | |
| defmacro handle(options) do | |
| queue = Keyword.fetch!(options, :queue) | |
| handler = Keyword.fetch!(options, :with) | |
| queue_handler = %QueueHandler{queue: queue, handler: handler} | |
| quote do | |
| @queue_handlers unquote(Macro.escape(queue_handler)) | |
| end | |
| end | |
| end |
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| defmodule MessageRouter.DSLTest do | |
| use ExUnit.Case, async: true | |
| defmodule Router do | |
| use MessageRouter.DSL | |
| route(key: "source.event", to: "destination.event") | |
| route(key: "other_source.event", to: "destination.event") | |
| handle(queue: "destination.queue", with: Handler) | |
| end | |
| test ".routes" do | |
| # Should be a map of queue name to routes | |
| assert Router.routes == %{} | |
| end | |
| test ".queue_handlers" do | |
| # Should be a list of handlers | |
| assert Router.queue_handlers == [] | |
| end | |
| end |
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