From d04d64e6eedf41f25b39a3366bc3dc4534843c52 Mon Sep 17 00:00:00 2001
From: Adam Kocoloski <kocolosk@apache.org>
Date: Sat, 18 Jul 2009 02:18:38 +0000
Subject: listen for local update notifications when continuous=true

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@795297 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couchdb/couch_rep_changes_feed.erl | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

(limited to 'src/couchdb/couch_rep_changes_feed.erl')

diff --git a/src/couchdb/couch_rep_changes_feed.erl b/src/couchdb/couch_rep_changes_feed.erl
index 35d6de1d..7aa34697 100644
--- a/src/couchdb/couch_rep_changes_feed.erl
+++ b/src/couchdb/couch_rep_changes_feed.erl
@@ -1,12 +1,12 @@
 % 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
+% 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
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 % License for the specific language governing permissions and limitations under
 % the License.
 
@@ -222,6 +222,18 @@ decode_row([$,, $\n | Rest]) ->
 decode_row(Row) ->
     ?JSON_DECODE(Row).
 
+flush_updated_messages() ->
+    receive updated -> flush_updated_messages()
+    after 0 -> ok
+    end.
+
+local_update_notification(Self, DbName, {updated, DbName}) ->
+    Self ! updated;
+local_update_notification(Self, DbName, {updated, DbName}) ->
+    Self ! deleted;
+local_update_notification(_, _, _) ->
+    ok.
+
 maybe_stream_next(false, Count, Id) when Count < ?MIN_BUFFER_SIZE ->
     ?LOG_DEBUG("~p reqid ~p streaming next chunk", [?MODULE, Id]),
     ibrowse:stream_next(Id);
@@ -230,8 +242,11 @@ maybe_stream_next(_Complete, _Count, Id) ->
     ok.
 
 send_local_changes_forever(Server, DbName, Since) ->
+    Self = self(),
+    {ok, _} = couch_db_update_notifier:start_link(
+        fun(Msg) -> local_update_notification(Self, DbName, Msg) end),
     {ok, NewSeq} = send_local_changes_once(Server, DbName, Since),
-    timer:sleep(5000),
+    ok = wait_db_updated(),
     send_local_changes_forever(Server, DbName, NewSeq).
 
 send_local_changes_once(Server, DbName, Since) ->
@@ -268,3 +283,12 @@ start_http_request(RawUrl) ->
     {ibrowse_req_id, Id} = 
         ibrowse:send_req_direct(Pid, RawUrl, [], get, [], Opts, infinity),
     {Pid, Id}.
+
+wait_db_updated() ->
+    receive deleted ->
+        exit(deleted)
+    after 0 ->
+        receive updated ->
+            flush_updated_messages()
+        end
+    end.
-- 
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