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-rw-r--r--doc/src/guide/connection_draining.asciidoc31
1 files changed, 30 insertions, 1 deletions
diff --git a/doc/src/guide/connection_draining.asciidoc b/doc/src/guide/connection_draining.asciidoc
index cee4dfa..2ccdbc8 100644
--- a/doc/src/guide/connection_draining.asciidoc
+++ b/doc/src/guide/connection_draining.asciidoc
@@ -6,7 +6,7 @@ a listener in a graceful fashion, ie by not accepting any new connections,
but allowing the existing connection processes to exit by themselves instead
of being killed.
-For this purpose, you should first suspend the listeners you wish to
+For this purpose, you should first suspend the listener you wish to
stop gracefully, and then wait for its connection count to drop to
zero.
@@ -67,3 +67,32 @@ after DrainTimeout ->
end,
ok = ranch:stop_listener(Ref).
----
+
+To drain listeners automatically as part of your application shutdown routine,
+use the `prep_stop/1` function of your application module.
+
+.Draining listeners automatically on application shutdown
+
+[source,erlang]
+----
+-module(my_app).
+
+-behavior(application).
+
+-export([start/2]).
+-export([prep_stop/1]).
+-export([stop/1]).
+
+start(_StartType, _StartArgs) ->
+ {ok, _} = ranch:start_listener(my_listener, ranch_tcp, #{}, my_protocol, []),
+ my_app_sup:start_link().
+
+prep_stop(State) ->
+ ok = ranch:suspend_listener(my_listener),
+ ok = ranch:wait_for_connections(my_listener, '==', 0),
+ ok = ranch:stop_listener(my_listener),
+ State.
+
+stop(_State) ->
+ ok.
+----