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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/bounded_context/commanded.ex
if Code.ensure_loaded?(Commanded) do
defmodule Cqrs.BoundedContext.Commanded do
@moduledoc """
If you are a `Commanded` user, you have already registered your commands with your commanded routers.
Instead of repeating yourself, you can cut down on boilerplate with the `import_commands/1` macro.
defmodule Users do
use Cqrs.BoundedContext
use Cqrs.BoundedContext.Commanded
import_commands CommandedRouter
query GetUser
end
"""
alias Cqrs.{BoundedContext, Guards}
defmacro __using__(_) do
quote do
import Cqrs.BoundedContext.Commanded, only: :macros
end
end
@doc """
Imports all of a [Command Router's](`Commanded.Commands.Router`) registered commands.
## Options
* `:only` - Restrict importing to only the commands listed
* `:except` - Imports commands except those listed
* `:after` - a list of function names and a function of one arity to run with the execution result
### Example
import_commands Example.Users.Router,
except: [CreateUser],
after: [
reinstate_user: &AfterExecution.load_user/1,
suspend_user: &AfterExecution.load_user/1
]
"""
defmacro import_commands(router, opts \\ []) do
opts = Macro.escape(opts)
quote do
Guards.ensure_is_commanded_router!(unquote(router))
only = Keyword.get(unquote(opts), :only, [])
except = Keyword.get(unquote(opts), :except, [])
commands = unquote(router).__registered_commands__()
commands =
case {only, except} do
{[], []} -> commands
{[], except} -> Enum.reject(commands, &Enum.member?(except, &1))
{only, []} -> Enum.filter(commands, &Enum.member?(only, &1))
_ -> raise "You can only specify :only or :except"
end
Enum.map(commands, fn module -> BoundedContext.command(module, unquote(opts)) end)
end
end
end
end