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% Copyright 2010 Cloudant
%
% 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.
-module(mem3_sync_event).
-behaviour(gen_event).
-export([init/1, handle_event/2, handle_call/2, handle_info/2, terminate/2,
code_change/3]).
init(_) ->
{ok, nil}.
handle_event({add_node, Node}, State) ->
Db1 = list_to_binary(couch_config:get("mem3", "node_db", "nodes")),
Db2 = list_to_binary(couch_config:get("mem3", "shard_db", "dbs")),
[mem3_sync:push(Db, Node) || Db <- [Db1, Db2]],
{ok, State};
handle_event({nodeup, Node}, State) ->
case lists:member(Node, mem3:nodes()) of
true ->
Db1 = list_to_binary(couch_config:get("mem3", "node_db", "nodes")),
Db2 = list_to_binary(couch_config:get("mem3", "shard_db", "dbs")),
[mem3_sync:push(Db, Node) || Db <- [Db1, Db2]];
false ->
ok
end,
{ok, State};
handle_event({Down, Node}, State) when Down == nodedown; Down == remove_node ->
mem3_sync:remove_node(Node),
{ok, State};
handle_event(_Event, State) ->
{ok, State}.
handle_call(_Request, State) ->
{ok, ok, State}.
handle_info(_Info, State) ->
{ok, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
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