Decrease apollo subscription session closed keep alive warnings to debug

Author: oliemansm

src/main/java/graphql/servlet/GraphQLWebsocketServlet.java

@@ -184,7 +184,7 @@ public int getSessionCount() {
 
     public int getSubscriptionCount() {
         return sessionSubscriptionCache.values().stream()
-                .mapToInt(subscriptions -> subscriptions.getSubscriptionCount())
+                .mapToInt(WsSessionSubscriptions::getSubscriptionCount)
                 .sum();
     }
 }

src/main/java/graphql/servlet/internal/ApolloSubscriptionKeepAliveRunner.java

@@ -44,11 +44,11 @@ private ScheduledFuture<?> startKeepAlive(Session session) {
                 if (session.isOpen()) {
                     sender.send(session, keepAliveMessage);
                 } else {
-                    LOG.warn("Session appears to be closed. Aborting keep alive");
+                    LOG.debug("Session {} appears to be closed. Aborting keep alive", session.getId());
                     abort(session);
                 }
             } catch (Throwable t) {
-                LOG.error("Cannot send keep alive message. Aborting keep alive", t);
+                LOG.error("Cannot send keep alive message to session {}. Aborting keep alive", session.getId(), t);
                 abort(session);
             }
         }, 0, keepAliveIntervalSeconds, TimeUnit.SECONDS);

src/main/java/graphql/servlet/internal/WsSessionSubscriptions.java

@@ -10,6 +10,7 @@
  * @author Andrew Potter
  */
 public class WsSessionSubscriptions {
+
     private final Object lock = new Object();
 
     private boolean closed = false;