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-% Copyright 2007-2008 Konrad-Zuse-Zentrum für Informationstechnik Berlin
-%
-% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
-%
-% Unless required by applicable law or agreed to in writing, software
-% distributed under the License is distributed on an "AS IS" BASIS,
-% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-% See the License for the specific language governing permissions and
-% limitations under the License.
-%%%-------------------------------------------------------------------
-%%% File : pubsub_api.erl
-%%% Author : Thorsten Schuett <[email protected]>
-%%% Description : Publish API function
-%%%
-%%% Created : 17 Sep 2007 by Thorsten Schuett <[email protected]>
-%%%-------------------------------------------------------------------
-%% @author Thorsten Schuett <[email protected]>
-%% @copyright 2007-2008 Konrad-Zuse-Zentrum für Informationstechnik Berlin
-%% @version $Id $
--module(pubsub_dir.pubsub_api).
-
--author('[email protected]').
--vsn('$Id: pubsub_api.erl,v 1.1 2009/11/06 12:39:55 maria Exp $ ').
-
--export([publish/2, subscribe/2, unsubscribe/2, get_subscribers/1]).
-
--import(transstore.transaction_api).
--import(io).
--import(lists).
-
-%%====================================================================
-%% public functions
-%%====================================================================
-
-%% @doc publishs an event under a given topic.
-%% called e.g. from the java-interface
-%% @spec publish(string(), string()) -> ok
-publish(Topic, Content) ->
- Subscribers = get_subscribers(Topic),
- io:format("calling subscribers ~p~n", [Subscribers]),
- lists:foreach(fun (Subscriber) ->
- io:format("calling ~p~n", [Subscriber]),
- pubsub_publish:publish(Subscriber, Topic, Content)
- end,
- Subscribers),
- ok.
-
-%% @doc subscribes a url for a topic.
-%% called e.g. from the java-interface
-%% @spec subscribe(string(), string()) -> ok | {fail, term()}
-subscribe(Topic, URL) ->
- TFun = fun(TransLog) ->
- {{Success, _ValueOrReason} = Result, TransLog1} = transaction_api:read(Topic, TransLog),
- {Result2, TransLog2} = if
- Success == fail ->
- transaction_api:write(Topic, [URL], TransLog); %obacht: muss TransLog sein!
- true ->
- {value, Subscribers} = Result,
- transaction_api:write(Topic, [URL | Subscribers], TransLog1)
- end,
- if
- Result2 == ok ->
- {{ok, ok}, TransLog2};
- true ->
- {Result2, TransLog2}
- end
- end,
- transaction_api:do_transaction(TFun, fun (_) -> ok end, fun (X) -> {fail, X} end).
-
-%% @doc unsubscribes a url for a topic.
--spec(unsubscribe/2 :: (string(), string()) -> ok | {fail, any()}).
-unsubscribe(Topic, URL) ->
- TFun = fun(TransLog) ->
- {Subscribers, TransLog1} = transaction_api:read2(TransLog, Topic),
- case lists:member(URL, Subscribers) of
- true ->
- NewSubscribers = lists:delete(URL, Subscribers),
- TransLog2 = transaction_api:write2(TransLog1, Topic, NewSubscribers),
- {{ok, ok}, TransLog2};
- false ->
- {{fail, not_found}, TransLog}
- end
- end,
- transaction_api:do_transaction(TFun, fun (_) -> ok end, fun (X) -> {fail, X} end).
-
-%% @doc queries the subscribers of a query
-%% @spec get_subscribers(string()) -> [string()]
-get_subscribers(Topic) ->
- {Fl, _Value} = transaction_api:quorum_read(Topic),
- if
- Fl == fail -> %% Fl is either Fail or the Value/Subscribers
- [];
- true ->
- Fl
- end.