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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License at
%% http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
%% License for the specific language governing rights and limitations
%% under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2010 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2010 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2010 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_exchange_type_registry).
-behaviour(gen_server).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([register/2, binary_to_type/1, lookup_module/1]).
-define(SERVER, ?MODULE).
-define(ETS_NAME, ?MODULE).
-ifdef(use_specs).
-spec(start_link/0 :: () -> 'ignore' | {'error', term()} | {'ok', pid()}).
-spec(register/2 :: (binary(), atom()) -> 'ok').
-spec(binary_to_type/1 :: (binary()) -> atom() | {'error', 'not_found'}).
-spec(lookup_module/1 :: (atom()) -> {'ok', atom()} | {'error', 'not_found'}).
-endif.
%%---------------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
%%---------------------------------------------------------------------------
register(TypeName, ModuleName) ->
gen_server:call(?SERVER, {register, TypeName, ModuleName}).
%% This is used with user-supplied arguments (e.g., on exchange
%% declare), so we restrict it to existing atoms only. This means it
%% can throw a badarg, indicating that the type cannot have been
%% registered.
binary_to_type(TypeBin) when is_binary(TypeBin) ->
case catch list_to_existing_atom(binary_to_list(TypeBin)) of
{'EXIT', {badarg, _}} -> {error, not_found};
TypeAtom -> TypeAtom
end.
lookup_module(T) when is_atom(T) ->
case ets:lookup(?ETS_NAME, T) of
[{_, Module}] ->
{ok, Module};
[] ->
{error, not_found}
end.
%%---------------------------------------------------------------------------
internal_binary_to_type(TypeBin) when is_binary(TypeBin) ->
list_to_atom(binary_to_list(TypeBin)).
internal_register(TypeName, ModuleName)
when is_binary(TypeName), is_atom(ModuleName) ->
ok = sanity_check_module(ModuleName),
true = ets:insert(?ETS_NAME,
{internal_binary_to_type(TypeName), ModuleName}),
ok.
sanity_check_module(Module) ->
case catch lists:member(rabbit_exchange_type,
lists:flatten(
[Bs || {Attr, Bs} <-
Module:module_info(attributes),
Attr =:= behavior orelse
Attr =:= behaviour])) of
{'EXIT', {undef, _}} -> {error, not_module};
false -> {error, not_exchange_type};
true -> ok
end.
%%---------------------------------------------------------------------------
init([]) ->
?ETS_NAME = ets:new(?ETS_NAME, [protected, set, named_table]),
{ok, none}.
handle_call({register, TypeName, ModuleName}, _From, State) ->
ok = internal_register(TypeName, ModuleName),
{reply, ok, State};
handle_call(Request, _From, State) ->
{stop, {unhandled_call, Request}, State}.
handle_cast(Request, State) ->
{stop, {unhandled_cast, Request}, State}.
handle_info(Message, State) ->
{stop, {unhandled_info, Message}, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
|
