!per #3704 Persistence improvements

- Channel enhancements (#3773):
- Live read models (#3776):
- Batch-oriented journal plugin API (#3804):
- Batching of confirmations and deletions
- Message deletion enhancements (more efficient range deletions)

akka-persistence/src/main/scala/akka/persistence/snapshot/SnapshotStore.scala

@@ -19,6 +19,7 @@ trait SnapshotStore extends Actor {
   import context.dispatcher
 
   private val extension = Persistence(context.system)
+  private val publish = extension.settings.internal.publishPluginCommands
 
   final def receive = {
     case LoadSnapshot(processorId, criteria, toSequenceNr) ⇒
@@ -44,10 +45,10 @@ trait SnapshotStore extends Actor {
       sender ! evt // sender is processor
     case d @ DeleteSnapshot(metadata) ⇒
       delete(metadata)
-      if (extension.publishPluginCommands) context.system.eventStream.publish(d)
+      if (publish) context.system.eventStream.publish(d)
     case d @ DeleteSnapshots(processorId, criteria) ⇒
       delete(processorId, criteria)
-      if (extension.publishPluginCommands) context.system.eventStream.publish(d)
+      if (publish) context.system.eventStream.publish(d)
   }
 
   //#snapshot-store-plugin-api