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gen_server_proxy
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0.1.0
Invokes call, cast or stop with a GenServer registered via a server ID. Will wait a bit if the GenServer is not yet registered on restarts.
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lib/gen_server/proxy.ex
defmodule GenServer.Proxy do
defmacro __using__(options) do
alias = options[:alias]
if alias do
quote do
alias unquote(__MODULE__), as: unquote(alias)
require unquote(alias)
end
else
quote do
import unquote(__MODULE__)
end
end
end
@doc ~S'''
Performs a GenServer call.
Will wait a bit if the server is not yet registered on restarts.
A `module` to implement the 2 callbacks of `GenServer.Proxy.Behaviour`
is required and the default name is _<caller's module>.Callback_.
## Examples
# Assuming the following callback module:
defmodule Game.Engine.Callback do
@behaviour GenServer.Proxy.Behaviour
@impl GenServer.Proxy.Behaviour
def server_name(game_name),
do: {:via, Registry, {:registry, game_name}}
@impl GenServer.Proxy.Behaviour
def server_unregistered(game_name),
do: IO.puts("Game #{game_name} not started.")
end
# We could use the call macro like so:
defmodule Game.Engine do
use GenServer.Proxy
def summary(game_name), do: call(:summary, game_name)
...
end
'''
defmacro call(request, server_id, module \\ nil) do
if module do
quote bind_quoted: [request: request, server_id: server_id] do
GenServer.Proxy.Call.call(request, server_id, unquote(module))
end
else
quote bind_quoted: [request: request, server_id: server_id] do
GenServer.Proxy.Call.call(request, server_id, __MODULE__.Callback)
end
end
end
defmacro cast(request, server_id, module \\ nil) do
if module do
quote bind_quoted: [request: request, server_id: server_id] do
GenServer.Proxy.Cast.cast(request, server_id, unquote(module))
end
else
quote bind_quoted: [request: request, server_id: server_id] do
GenServer.Proxy.Cast.cast(request, server_id, __MODULE__.Callback)
end
end
end
defmacro stop(reason, server_id, module \\ nil) do
if module do
quote bind_quoted: [reason: reason, server_id: server_id] do
GenServer.Proxy.Stop.stop(reason, server_id, unquote(module))
end
else
quote bind_quoted: [reason: reason, server_id: server_id] do
GenServer.Proxy.Stop.stop(reason, server_id, __MODULE__.Callback)
end
end
end
end