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Aspect-Oriented Programming in Elixir
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== Example Usage == Let's consider an example where we want to add logging to specific functions in our application. ```elixir defmodule Logger do defmacro __using__(_) do quote do import Logger deflog :info, __ENV__.module, __ENV__.function, Macro.escape(__ENV__.args) deflog :debug, __ENV__.module, __ENV__.function, Macro.escape(__ENV__.args) end end defmacro deflog(level, module, function, args) do quote do def unquote(:"log_#{function}")(arg) do IO.puts("#{module}.#{function}(#{Enum.join(arg, ", ")}) called with arguments: #{inspect(unquote(args))}") unquote(arg) end end end end ``` The `Logger` module defines a macro called `__using__` that imports the `Logger` module and uses two other macros to define the logging functions `log_info` and `log_debug`. To use this aspect, we can simply `use` the `Logger` module in the desired modules: ```elixir defmodule Example do use Logger def log_example(arg) do log_info(arg) :ok end end ``` Now, every time `log_example` is called, the `log_info` function defined in the `Logger` aspect will be executed, logging the function name, arguments, and module name.
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