Start new mbus servers before stopping old ones

1 files changed, 8 insertions, 0 deletions

diff --git a/jdisc_core/src/main/java/com/yahoo/jdisc/service/ServerProvider.java b/jdisc_core/src/main/java/com/yahoo/jdisc/service/ServerProvider.java
index ef72e643dae..ecdc30400f1 100644
--- a/jdisc_core/src/main/java/com/yahoo/jdisc/service/ServerProvider.java
+++ b/jdisc_core/src/main/java/com/yahoo/jdisc/service/ServerProvider.java
@@ -49,4 +49,12 @@ public interface ServerProvider extends SharedResource {
      * Application} shutdown code.</p>
      */
     void close();
+
+    /**
+     * Whether multiple instances of this can coexist, by means of a multiplexer on top of any exclusive resource.
+     * If this is true, new instances to replace old ones, during a graph generation switch, will be started before
+     * the obsolete ones are stopped; otherwise, the old will be stopped, and then the new ones started.
+     */
+    default boolean isMultiplexed() { return false; }
+
 }