[GitHub] nickva commented on a change in pull request #838: Do not buffer rexi messages to disconnected nodes

[gi...@git.apache.org]

nickva commented on a change in pull request #838: Do not buffer rexi messages to disconnected nodes
URL: https://github.com/apache/couchdb/pull/838#discussion_r140856845
 
 

 ##########
 File path: src/mem3/src/mem3_cluster.erl
 ##########
 @@ -0,0 +1,161 @@
+% 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.
+
+% Maintain cluster stability information. A cluster is considered stable if there
+% were no changes to during a given period of time.
+%
+% To be notified of cluster stability / instability the owner module must
+% implement the mem3_cluster behavior. When cluster membership changes,
+% cluster_unstable behavior callback will be called. After that is are no more
+% changes to the cluster, then cluster_stable callback will be called.
+%
+% The period is passed in as start argument but it can also be set dynamically
+% via the set_period/2 API call.
+%
+% In some cases it might be useful to have a shorter pariod during startup.
+% That can be configured via the StartPeriod argument. If the time since start
+% is less than a full period, then the StartPeriod is used as the period.
+
+
+-module(mem3_cluster).
+
+-behaviour(gen_server).
+
+-export([
+    start_link/4,
+    set_period/2
+]).
+
+-export([
+    init/1,
+    terminate/2,
+    handle_call/3,
+    handle_cast/2,
+    handle_info/2,
+    code_change/3
+]).
+
+
+-callback cluster_stable(Context :: term()) -> Context :: term().
 
 Review comment:
   Good catch. Will fix.
 
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