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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_db_doc_count).
-export([go/1]).
-include("fabric.hrl").
-include_lib("mem3/include/mem3.hrl").
-include_lib("couch/include/couch_db.hrl").
go(DbName) ->
Shards = mem3:shards(DbName),
Workers = fabric_util:submit_jobs(Shards, get_doc_count, []),
RexiMon = fabric_util:create_monitors(Shards),
Acc0 = {fabric_dict:init(Workers, nil), 0},
try
fabric_util:recv(Workers, #shard.ref, fun handle_message/3, Acc0)
after
rexi_monitor:stop(RexiMon)
end.
handle_message({rexi_DOWN, _, {_,NodeRef},_}, _Shard, {Counters, Acc}) ->
case fabric_util:remove_down_workers(Counters, NodeRef) of
{ok, NewCounters} ->
{ok, {NewCounters, Acc}};
error ->
{error, {nodedown, <<"progress not possible">>}}
end;
handle_message({rexi_EXIT, Reason}, Shard, {Counters, Acc}) ->
NewCounters = lists:keydelete(Shard, 1, Counters),
case fabric_view:is_progress_possible(NewCounters) of
true ->
{ok, {NewCounters, Acc}};
false ->
{error, Reason}
end;
handle_message({ok, Count}, 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, Count+Acc}};
false ->
{stop, Count+Acc}
end
end;
handle_message(_, _, Acc) ->
{ok, Acc}.
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