[GitHub] eolivelli commented on a change in pull request #819: ZOOKEEPER-3272: Clean up netty4 code per Norman Maurer's review comments

[GitBox <gi...@apache.org>]

eolivelli commented on a change in pull request #819: ZOOKEEPER-3272: Clean up netty4 code per Norman Maurer's review comments
URL: https://github.com/apache/zookeeper/pull/819#discussion_r256607222
 
 

 ##########
 File path: zookeeper-server/src/main/java/org/apache/zookeeper/server/NettyServerCnxnFactory.java
 ##########
 @@ -192,14 +192,16 @@ public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
             }
         }
 
-        @Override
-        public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+        // Use a single listener instance to reduce GC
+        private final GenericFutureListener<Future<Void>> onWriteCompletedListener = (f) -> {
             if (LOG.isTraceEnabled()) {
-                promise.addListener((future) -> {
-                    LOG.trace("write {}",
-                            future.isSuccess() ? "complete" : "failed");
-                });
+                LOG.trace("write {}", f.isSuccess() ? "complete" : "failed");
             }
+        };
+
+        @Override
+        public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+            promise.addListener(onWriteCompletedListener);
 
 Review comment:
   What about this:
   ```
   if (LOG.isTraceEnabled()) {
      promise.addListener(onWriteCompletedListener);
   }
   ```

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services