[GitHub] [kafka] Hangleton commented on a diff in pull request #13169: Port opening fix

["Hangleton (via GitHub)" <gi...@apache.org>]

Hangleton commented on code in PR #13169:
URL: https://github.com/apache/kafka/pull/13169#discussion_r1088918527


##########
clients/src/main/java/org/apache/kafka/common/utils/Time.java:
##########
@@ -86,4 +89,30 @@ default Timer timer(Duration timeout) {
         return timer(timeout.toMillis());
     }
 
+    /**
+     * Wait for a future to complete, or time out.
+     *
+     * @param future        The future to wait for.
+     * @param deadlineNs    The time in the future, in monotonic nanoseconds, to time out.
+     * @return              The result of the future.
+     * @param <T>           The type of the future.
+     */
+    default <T> T waitForFuture(
+        CompletableFuture<T> future,
+        long deadlineNs
+    ) throws TimeoutException, InterruptedException, ExecutionException  {
+        TimeoutException timeoutException = null;
+        while (true) {
+            long nowNs = nanoseconds();
+            if (deadlineNs <= nowNs) {
+                throw (timeoutException == null) ? new TimeoutException() : timeoutException;
+            }
+            long deltaNs = deadlineNs - nowNs;
+            try {
+                return future.get(deltaNs, TimeUnit.NANOSECONDS);

Review Comment:
   Naive question - what is incorrect with 
   
   ```
   default <T> T waitForFuture(
           CompletableFuture<T> future,
           long deadlineNs
       ) throws TimeoutException, InterruptedException, ExecutionException  {
   
     return future.get(Math.max(0, deadlineNs - nanoseconds()))
   }
   ```



##########
server-common/src/main/java/org/apache/kafka/server/util/FutureUtils.java:
##########
@@ -0,0 +1,135 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.server.util;
+
+import org.apache.kafka.common.utils.Time;
+import org.slf4j.Logger;
+
+import java.math.BigInteger;
+import java.util.Collection;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeoutException;
+import java.util.function.BiConsumer;
+
+
+public class FutureUtils {
+    /**
+     * Based on the current time and a delay, computes a monotonic deadline in the future.
+     *
+     * @param nowNs     The current time in monotonic nanoseconds.
+     * @param delayMs   The delay in milliseconds.
+     * @return          The monotonic deadline in the future. This value is capped at
+     *                  Long.MAX_VALUE.
+     */
+    public static long getDeadlineNsFromDelayMs(
+        long nowNs,
+        long delayMs
+    ) {
+        if (delayMs < 0) {
+            throw new RuntimeException("Negative delays are not allowed.");
+        }
+        BigInteger delayNs = BigInteger.valueOf(delayMs).multiply(BigInteger.valueOf(1_000_000));

Review Comment:
   Curious - which use cases result in overflow of the long values in this context?



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