sergey-chugunov-1985 commented on code in PR #12335:
URL: https://github.com/apache/ignite/pull/12335#discussion_r2348964326


##########
modules/core/src/main/java/org/apache/ignite/internal/direct/stream/DirectByteBufferStream.java:
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@@ -862,6 +864,16 @@ public void writeKeyCacheObject(KeyCacheObject keyObj) {
         }
     }
 
+    /**
+     * @param val Value.
+     */
+    public void writeGridLongList(@Nullable GridLongList val) {

Review Comment:
   I think this implementation could use the fact that `writeLongArray(long[] 
arr, int len)` performs internal null check for the first argument and writes 
`-1` if null was passed.
   
   From that perspective it may make sense to get rid of these two methods in 
`DirectByteBufferStream` and move logic of creating `GridLongList` instances to 
`DirectMessageReader`/`DirectMessageWriter` implementations.



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