chia7712 commented on code in PR #16242:
URL: https://github.com/apache/kafka/pull/16242#discussion_r1632034986


##########
clients/src/main/java/org/apache/kafka/common/utils/Time.java:
##########
@@ -30,8 +30,6 @@
  */
 public interface Time {
 
-    Time SYSTEM = new SystemTime();

Review Comment:
   If we want to make sure "only one" `SystemTime` is created, maybe we can 
inline the implementation? Keeping the `Time#SYSTEM` can avoid large changes. 
For example:
   
   ```java
       Time SYSTEM = new Time() {
           @Override
           public long milliseconds() {
               return System.currentTimeMillis();
           }
   
           @Override
           public long nanoseconds() {
               return System.nanoTime();
           }
   
           @Override
           public void sleep(long ms) {
               Utils.sleep(ms);
           }
   
           @Override
           public void waitObject(Object obj, Supplier<Boolean> condition, long 
deadlineMs) throws InterruptedException {
               synchronized (obj) {
                   while (true) {
                       if (condition.get())
                           return;
   
                       long currentTimeMs = milliseconds();
                       if (currentTimeMs >= deadlineMs)
                           throw new 
org.apache.kafka.common.errors.TimeoutException("Condition not satisfied before 
deadline");
   
                       obj.wait(deadlineMs - currentTimeMs);
                   }
               }
           }
       };
   ```
   
   WDYT?



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