From c43ae32b00ab64e5427b924867a4783ca0edee57 Mon Sep 17 00:00:00 2001
From: John Christopher Anderson <jchris@apache.org>
Date: Wed, 7 Apr 2010 02:25:36 +0000
Subject: changes is less likely to miss updates, and changes test is more
 robust

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@931407 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couchdb/couch_changes.erl | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'src/couchdb')

diff --git a/src/couchdb/couch_changes.erl b/src/couchdb/couch_changes.erl
index 35ea147f..9496c226 100644
--- a/src/couchdb/couch_changes.erl
+++ b/src/couchdb/couch_changes.erl
@@ -17,7 +17,7 @@
 
 %% @type Req -> #httpd{} | {json_req, JsonObj()}
 handle_changes(#changes_args{}=Args1, Req, Db) ->
-    Args = Args1#changes_args{filter=make_filter_fun(Args1, Req, Db)},
+    Args = Args1#changes_args{filter=make_filter_fun(Args1#changes_args.filter, Req, Db)},
     StartSeq = case Args#changes_args.dir of
     rev ->
         couch_db:get_update_seq(Db);
@@ -27,7 +27,6 @@ handle_changes(#changes_args{}=Args1, Req, Db) ->
     if Args#changes_args.feed == "continuous" orelse
         Args#changes_args.feed == "longpoll" ->
         fun(Callback) ->
-            start_sending_changes(Callback, Args#changes_args.feed),
             Self = self(),
             {ok, Notify} = couch_db_update_notifier:start_link(
                 fun({_, DbName}) when DbName == Db#db.name ->
@@ -36,6 +35,7 @@ handle_changes(#changes_args{}=Args1, Req, Db) ->
                     ok
                 end
             ),
+            start_sending_changes(Callback, Args#changes_args.feed),
             {Timeout, TimeoutFun} = get_changes_timeout(Args, Callback),
             couch_stats_collector:track_process_count(
                 Self,
@@ -72,7 +72,7 @@ handle_changes(#changes_args{}=Args1, Req, Db) ->
     end.
 
 %% @type Req -> #httpd{} | {json_req, JsonObj()}
-make_filter_fun(#changes_args{filter=FilterName}, Req, Db) ->
+make_filter_fun(FilterName, Req, Db) ->
     case [list_to_binary(couch_httpd:unquote(Part))
             || Part <- string:tokens(FilterName, "/")] of
     [] ->
@@ -94,6 +94,7 @@ make_filter_fun(#changes_args{filter=FilterName}, Req, Db) ->
             {ok, Passes} = couch_query_servers:filter_docs(
                 Req, Db, DDoc, FName, Docs
             ),
+            % ?LOG_INFO("filtering ~p ~w",[FName, [DI#doc_info.high_seq || DI <- DocInfos]]),
             [{[{<<"rev">>, couch_doc:rev_to_str(Rev)}]}
                 || #doc_info{revs=[#rev_info{rev=Rev}|_]} <- DocInfos,
                 Pass <- Passes, Pass == true]
@@ -155,20 +156,22 @@ send_changes(Args, Callback, Db, StartSeq, Prepend) ->
 
 keep_sending_changes(Args, Callback, Db, StartSeq, Prepend, Timeout,
     TimeoutFun) ->
-
     #changes_args{
         feed = ResponseType,
         limit = Limit
     } = Args,
+    % ?LOG_INFO("send_changes start ~p",[StartSeq]),
     {ok, {_, EndSeq, Prepend2, _, _, _, NewLimit, _}} = send_changes(
         Args#changes_args{dir=fwd}, Callback, Db, StartSeq, Prepend
     ),
+    % ?LOG_INFO("send_changes last ~p",[EndSeq]),
     couch_db:close(Db),
     if Limit > NewLimit, ResponseType == "longpoll" ->
         end_sending_changes(Callback, EndSeq, ResponseType);
     true ->
         case wait_db_updated(Timeout, TimeoutFun) of
         updated ->
+            % ?LOG_INFO("wait_db_updated updated ~p",[{Db#db.name, EndSeq}]),
             case couch_db:open(Db#db.name, [{user_ctx, Db#db.user_ctx}]) of
             {ok, Db2} ->
                 keep_sending_changes(
@@ -184,6 +187,7 @@ keep_sending_changes(Args, Callback, Db, StartSeq, Prepend, Timeout,
                 end_sending_changes(Callback, EndSeq, ResponseType)
             end;
         stop ->
+            % ?LOG_INFO("wait_db_updated stop ~p",[{Db#db.name, EndSeq}]),
             end_sending_changes(Callback, EndSeq, ResponseType)
         end
     end.
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