Added check on rotate frequency

micrometer-core/src/main/java/io/micrometer/core/instrument/distribution/TimeWindowMax.java

@@ -54,7 +54,7 @@ public TimeWindowMax(Clock clock, DistributionStatisticConfig config) {
 
     public TimeWindowMax(Clock clock, long rotateFrequencyMillis, int bufferLength) {
         this.clock = clock;
-        this.durationBetweenRotatesMillis = rotateFrequencyMillis;
+        this.durationBetweenRotatesMillis = checkPositive(rotateFrequencyMillis);
         this.lastRotateTimestampMillis = clock.wallTime();
         this.currentBucket = 0;
 
@@ -64,6 +64,13 @@ public TimeWindowMax(Clock clock, long rotateFrequencyMillis, int bufferLength)
         }
     }
 
+    private static long checkPositive(long rotateFrequencyMillis) {
+        if (rotateFrequencyMillis <= 0) {
+            throw new IllegalArgumentException("Rotate frequency must be a positive number");
+        }
+        return rotateFrequencyMillis;
+    }
+
     /**
      * For use by timer implementations.
      * @param sample The value to record.

micrometer-core/src/test/java/io/micrometer/core/instrument/distribution/TimeWindowMaxTest.java

@@ -16,6 +16,7 @@
 package io.micrometer.core.instrument.distribution;
 
 import io.micrometer.core.instrument.MockClock;
+import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 import java.time.Duration;
@@ -68,4 +69,11 @@ void testLongPeriodOfInactivity() {
         assertThat(timeWindowMax.poll()).isEqualTo(100500); // 666 | 500 | 100500
     }
 
+    @Test
+    void throwsExceptionWhenRotateFrequency0() {
+        Assertions.assertThatThrownBy(() -> new TimeWindowMax(clock, 0, 3))
+            .isInstanceOf(IllegalArgumentException.class)
+            .withFailMessage("Rotate frequency must be a positive number");
+    }
+
 }