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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) 2007-2009 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_topic).
-include("rabbit.hrl").
-behaviour(rabbit_exchange_type).
-export([description/0, publish/2]).
-export([validate/1, create/1, recover/2, delete/2,
add_binding/2, remove_bindings/2]).
-include("rabbit_exchange_type_spec.hrl").
-rabbit_boot_step({?MODULE,
[{description, "exchange type topic"},
{mfa, {rabbit_exchange_type_registry, register,
[<<"topic">>, ?MODULE]}},
{requires, rabbit_exchange_type_registry},
{enables, kernel_ready}]}).
-export([topic_matches/2]).
-ifdef(use_specs).
-spec(topic_matches/2 :: (binary(), binary()) -> boolean()).
-endif.
description() ->
[{name, <<"topic">>},
{description, <<"AMQP topic exchange, as per the AMQP specification">>}].
publish(#exchange{name = Name}, Delivery =
#delivery{message = #basic_message{routing_key = RoutingKey}}) ->
rabbit_router:deliver(rabbit_router:match_bindings(
Name, fun (#binding{key = BindingKey}) ->
topic_matches(BindingKey, RoutingKey)
end),
Delivery).
split_topic_key(Key) ->
{ok, KeySplit} = regexp:split(binary_to_list(Key), "\\."),
KeySplit.
topic_matches(PatternKey, RoutingKey) ->
P = split_topic_key(PatternKey),
R = split_topic_key(RoutingKey),
topic_matches1(P, R).
topic_matches1(["#"], _R) ->
true;
topic_matches1(["#" | PTail], R) ->
last_topic_match(PTail, [], lists:reverse(R));
topic_matches1([], []) ->
true;
topic_matches1(["*" | PatRest], [_ | ValRest]) ->
topic_matches1(PatRest, ValRest);
topic_matches1([PatElement | PatRest], [ValElement | ValRest])
when PatElement == ValElement ->
topic_matches1(PatRest, ValRest);
topic_matches1(_, _) ->
false.
last_topic_match(P, R, []) ->
topic_matches1(P, R);
last_topic_match(P, R, [BacktrackNext | BacktrackList]) ->
topic_matches1(P, R) or
last_topic_match(P, [BacktrackNext | R], BacktrackList).
validate(_X) -> ok.
create(_X) -> ok.
recover(_X, _Bs) -> ok.
delete(_X, _Bs) -> ok.
add_binding(_X, _B) -> ok.
remove_bindings(_X, _Bs) -> ok.
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