[grid] Add lock while finding a node in GridModel. Fix a log typo. (#8980)

Co-authored-by: Diego Molina <[email protected]>

Author: pujagani

java/server/src/org/openqa/selenium/grid/distributor/local/GridModel.java

@@ -305,41 +305,47 @@ private void reserve(NodeStatus status, Slot slot) {
   public void setSession(SlotId slotId, Session session) {
     Require.nonNull("Slot ID", slotId);
 
-    AvailabilityAndNode node = findNode(slotId.getOwningNodeId());
-    if (node == null) {
-      LOG.warning("Grid model and reality have diverged. Unable to find node " + slotId.getOwningNodeId());
-      return;
-    }
+    Lock writeLock = lock.writeLock();
+    writeLock.lock();
+    try {
+      AvailabilityAndNode node = findNode(slotId.getOwningNodeId());
+      if (node == null) {
+        LOG.warning("Grid model and reality have diverged. Unable to find node " + slotId.getOwningNodeId());
+        return;
+      }
 
-    Optional<Slot> maybeSlot = node.status.getSlots().stream()
-      .filter(slot -> slotId.equals(slot.getId()))
-      .findFirst();
+      Optional<Slot> maybeSlot = node.status.getSlots().stream()
+        .filter(slot -> slotId.equals(slot.getId()))
+        .findFirst();
 
-    if (!maybeSlot.isPresent()) {
-      LOG.warning("Grid model and reality have diverged. Unable to find slot " + slotId);
-      return;
-    }
+      if (!maybeSlot.isPresent()) {
+        LOG.warning("Grid model and reality have diverged. Unable to find slot " + slotId);
+        return;
+      }
 
-    Slot slot = maybeSlot.get();
-    Optional<Session> maybeSession = slot.getSession();
-    if (!maybeSession.isPresent()) {
-      LOG.warning("Grid model and reality have diverged. Slot is not reserved. " + slotId);
-      return;
-    }
+      Slot slot = maybeSlot.get();
+      Optional<Session> maybeSession = slot.getSession();
+      if (!maybeSession.isPresent()) {
+        LOG.warning("Grid model and reality have diverged. Slot is not reserved. " + slotId);
+        return;
+      }
 
-    Session current = maybeSession.get();
-    if (!RESERVED.equals(current.getId())) {
-      LOG.warning("Gid model and reality have diverged. Slot has session and is not reserved. " + slotId);
-      return;
-    }
+      Session current = maybeSession.get();
+      if (!RESERVED.equals(current.getId())) {
+        LOG.warning("Grid model and reality have diverged. Slot has session and is not reserved. " + slotId);
+        return;
+      }
 
-    Slot updated = new Slot(
-      slot.getId(),
-      slot.getStereotype(),
-      session == null ? slot.getLastStarted() : session.getStartTime(),
-      Optional.ofNullable(session));
+      Slot updated = new Slot(
+        slot.getId(),
+        slot.getStereotype(),
+        session == null ? slot.getLastStarted() : session.getStartTime(),
+        Optional.ofNullable(session));
 
-    amend(node.availability, node.status, updated);
+      amend(node.availability, node.status, updated);
+    } finally {
+      writeLock.unlock();
+    }
   }
 
   private void amend(Availability availability, NodeStatus status, Slot slot) {