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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(fabric_group_info).
-export([go/2]).
-include("fabric.hrl").
-include_lib("mem3/include/mem3.hrl").
-include_lib("couch/include/couch_db.hrl").
go(DbName, GroupId) when is_binary(GroupId) ->
{ok, DDoc} = fabric:open_doc(DbName, GroupId, []),
go(DbName, DDoc);
go(DbName, #doc{} = DDoc) ->
Group = couch_view_group:design_doc_to_view_group(DDoc),
Shards = mem3:shards(DbName),
Workers = fabric_util:submit_jobs(Shards, group_info, [Group]),
Acc0 = {fabric_dict:init(Workers, nil), []},
fabric_util:recv(Workers, #shard.ref, fun handle_message/3, Acc0).
handle_message({ok, Info}, Shard, {Counters, Acc}) ->
case fabric_dict:lookup_element(Shard, Counters) of
undefined ->
% already heard from someone else in this range
{ok, {Counters, Acc}};
nil ->
C1 = fabric_dict:store(Shard, ok, Counters),
C2 = fabric_view:remove_overlapping_shards(Shard, C1),
case fabric_dict:any(nil, C2) of
true ->
{ok, {C2, [Info|Acc]}};
false ->
{stop, merge_results(lists:flatten([Info|Acc]))}
end
end;
handle_message(_, _, Acc) ->
{ok, Acc}.
merge_results(Info) ->
Dict = lists:foldl(fun({K,V},D0) -> orddict:append(K,V,D0) end,
orddict:new(), Info),
orddict:fold(fun
(signature, [X|_], Acc) ->
[{signature, X} | Acc];
(language, [X|_], Acc) ->
[{language, X} | Acc];
(disk_size, X, Acc) ->
[{disk_size, lists:sum(X)} | Acc];
(compact_running, X, Acc) ->
[{compact_running, lists:member(true, X)} | Acc];
(_, _, Acc) ->
Acc
end, [], Dict).
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