svn commit: r687062 - /incubator/couchdb/branches/runtimeconfig/src/couchdb/couch_db_update_notifier_sup.erl

[da...@apache.org]

Author: damien
Date: Tue Aug 19 07:30:35 2008
New Revision: 687062

URL: http://svn.apache.org/viewvc?rev=687062&view=rev
Log:
added new file to SVN from missing from previous checkins

Added:
    incubator/couchdb/branches/runtimeconfig/src/couchdb/couch_db_update_notifier_sup.erl

Added: incubator/couchdb/branches/runtimeconfig/src/couchdb/couch_db_update_notifier_sup.erl
URL: http://svn.apache.org/viewvc/incubator/couchdb/branches/runtimeconfig/src/couchdb/couch_db_update_notifier_sup.erl?rev=687062&view=auto
==============================================================================
--- incubator/couchdb/branches/runtimeconfig/src/couchdb/couch_db_update_notifier_sup.erl (added)
+++ incubator/couchdb/branches/runtimeconfig/src/couchdb/couch_db_update_notifier_sup.erl Tue Aug 19 07:30:35 2008
@@ -0,0 +1,48 @@
+% 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.
+
+%
+% This causes an OS process to spawned and it is notified every time a database
+% is updated.
+%
+% The notifications are in the form of a the database name sent as a line of
+% text to the OS processes stdout.
+%
+
+-module(couch_db_update_notifier_sup).
+
+-behaviour(supervisor).
+
+-export([start_link/0,init/1]).
+
+start_link() ->
+    supervisor:start_link({local, couch_db_update_notifier_sup},
+        couch_db_update_notifier_sup, []).
+
+init([]) ->
+    ok = couch_config:register(
+        fun({"CouchDB", "DbUpdateNotificationProcess"}) ->
+            ?MODULE:stop()
+        end),
+    UpdateNotifierExes = couch_config:lookup_match(
+            {{"CouchDB", "DbUpdateNotificationProcess"}, '$1'}, []),
+
+    {ok,
+        {{one_for_one, 10, 3600}, 
+            lists:map(fun({UpdateNotifierExe}) ->
+                {UpdateNotifierExe,
+                {couch_db_update_notifier, start_link, [UpdateNotifierExe]},
+                    permanent,
+                    1000,
+                    supervisor,
+                    [couch_db_update_notifier]}
+                end, UpdateNotifierExes)}}.
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