1 files changed, 68 insertions, 0 deletions
diff --git a/deps/fabric/src/fabric_db_doc_count.erl b/deps/fabric/src/fabric_db_doc_count.erl
new file mode 100644
index 00000000..107f212a
--- /dev/null
+++ b/deps/fabric/src/fabric_db_doc_count.erl
@@ -0,0 +1,68 @@
+% 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}.
+