davebarnes97 commented on a change in pull request #5968:
URL: https://github.com/apache/geode/pull/5968#discussion_r568879819



##########
File path: 
geode-core/src/main/java/org/apache/geode/internal/cache/wan/AbstractGatewaySenderEventProcessor.java
##########
@@ -173,14 +174,25 @@ public int getTotalQueueSize() {
 
   protected abstract void initializeMessageQueue(String id, boolean 
cleanQueues);
 
-  public void enqueueEvent(EnumListenerEvent operation, EntryEvent event,
+  public boolean enqueueEvent(EnumListenerEvent operation, EntryEvent event,
       Object substituteValue) throws IOException, CacheException {
-    enqueueEvent(operation, event, substituteValue, false);
+    return enqueueEvent(operation, event, substituteValue, false, null);
   }
 
-  public abstract void enqueueEvent(EnumListenerEvent operation, EntryEvent 
event,
-      Object substituteValue, boolean isLastEventInTransaction) throws 
IOException, CacheException;
-
+  /**
+   *
+   * @param operation The operation
+   * @param event The event to be put in the queue
+   * @param substituteValue The substitute value
+   * @param isLastEventInTransaction True if this event is the last one in the
+   *        transaction it belongs to
+   * @param condition If not null, the event will be enqueued only if the 
predicate
+   *        matches at least with one elements in the queue

Review comment:
       "matches at least with one elements" -> "matches at least one element"




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