Backed out changeset b2ff7bbc3df6

re-introducing pluggable exchange types on a branch

3 files changed, 117 insertions, 9 deletions

diff --git a/src/rabbit.erl b/src/rabbit.erl
index c6dde385..3293927a 100644
--- a/src/rabbit.erl
+++ b/src/rabbit.erl
@@ -134,6 +134,7 @@ start(normal, []) ->
         fun () -> ok = rabbit_mnesia:init() end},
        {"core processes",
         fun () ->
+                ok = start_child(rabbit_exchange_type),
                 ok = start_child(rabbit_log),
                 ok = rabbit_hooks:start(),
 
diff --git a/src/rabbit_exchange.erl b/src/rabbit_exchange.erl
index 09ea1e96..be73e818 100644
--- a/src/rabbit_exchange.erl
+++ b/src/rabbit_exchange.erl
@@ -134,18 +134,18 @@ declare(ExchangeName, Type, Durable, AutoDelete, Args) ->
               end
       end).
 
-typename_to_plugin_module(T) when is_binary(T) ->
-    case catch list_to_existing_atom("rabbit_exchange_type_" ++ binary_to_list(T)) of
-        {'EXIT', {badarg, _}} ->
+typename_to_plugin_module(T) ->
+    case rabbit_exchange_type:lookup_module(T) of
+        {ok, Module} ->
+            Module;
+        {error, not_found} ->
             rabbit_misc:protocol_error(
-              command_invalid, "invalid exchange type '~s'", [T]);
-        Module ->
-            Module
+              command_invalid, "invalid exchange type '~s'", [T])
     end.
 
-plugin_module_to_typename(M) when is_atom(M) ->
-    "rabbit_exchange_type_" ++ S = atom_to_list(M),
-    list_to_binary(S).
+plugin_module_to_typename(M) ->
+    {ok, TypeName} = rabbit_exchange_type:lookup_name(M),
+    TypeName.
 
 check_type(T) ->
     Module = typename_to_plugin_module(T),
diff --git a/src/rabbit_exchange_type.erl b/src/rabbit_exchange_type.erl
new file mode 100644
index 00000000..58dcfbb6
--- /dev/null
+++ b/src/rabbit_exchange_type.erl
@@ -0,0 +1,107 @@
+%%   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) 2007-2009 LShift
+%%   Ltd. Portions created by Cohesive Financial Technologies LLC are
+%%   Copyright (C) 2007-2009 Cohesive Financial Technologies
+%%   LLC. Portions created by Rabbit Technologies Ltd are Copyright
+%%   (C) 2007-2009 Rabbit Technologies Ltd.
+%%
+%%   All Rights Reserved.
+%%
+%%   Contributor(s): ______________________________________.
+%%
+
+-module(rabbit_exchange_type).
+
+-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, lookup_module/1, lookup_name/1]).
+
+-define(SERVER, ?MODULE).
+
+%%---------------------------------------------------------------------------
+
+start_link() ->
+    gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
+
+%%---------------------------------------------------------------------------
+
+register(TypeName, ModuleName) ->
+    gen_server:call(?SERVER, {register, TypeName, ModuleName}).
+
+lookup_module(T) when is_binary(T) ->
+    case ets:lookup(rabbit_exchange_type_modules, T) of
+        [{_, Module}] ->
+            {ok, Module};
+        [] ->
+            {error, not_found}
+    end.
+
+lookup_name(M) when is_atom(M) ->
+    [{_, TypeName}] = ets:lookup(rabbit_exchange_type_names, M),
+    {ok, TypeName}.
+
+%%---------------------------------------------------------------------------
+
+internal_register(TypeName, ModuleName)
+  when is_binary(TypeName), is_atom(ModuleName) ->
+    true = ets:insert(rabbit_exchange_type_modules, {TypeName, ModuleName}),
+    true = ets:insert(rabbit_exchange_type_names, {ModuleName, TypeName}),
+    ok.
+
+%%---------------------------------------------------------------------------
+
+init([]) ->
+    rabbit_exchange_type_modules =
+        ets:new(rabbit_exchange_type_modules, [protected, set, named_table]),
+    rabbit_exchange_type_names =
+        ets:new(rabbit_exchange_type_names, [protected, set, named_table]),
+
+    %% TODO: split out into separate boot startup steps.
+    ok = internal_register(<<"direct">>, rabbit_exchange_type_direct),
+    ok = internal_register(<<"fanout">>, rabbit_exchange_type_fanout),
+    ok = internal_register(<<"headers">>, rabbit_exchange_type_headers),
+    ok = internal_register(<<"topic">>, rabbit_exchange_type_topic),
+
+    {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}.