adamdebreceni commented on a change in pull request #958:
URL: https://github.com/apache/nifi-minifi-cpp/pull/958#discussion_r542433430



##########
File path: libminifi/include/utils/TimeUtil.h
##########
@@ -53,6 +53,29 @@ inline uint64_t getTimeNano() {
   return 
std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
 }
 
+/**
+ * Mockable clock classes
+ */
+class Clock {
+ public:
+  virtual ~Clock() = default;
+  virtual std::chrono::milliseconds timeSinceEpoch() const = 0;

Review comment:
       regarding the `std::function<...>`, I would keep the `Clock` class, as 
IMO it better describes its usage




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