blob: e4f8c6d76ed4e28007718b69f5c19612889afc11 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.jdisc.metric;
import com.yahoo.jdisc.Metric;
import com.yahoo.test.ManualClock;
import org.junit.Test;
import java.lang.management.ManagementFactory;
import java.time.Duration;
import java.util.LinkedList;
import static org.junit.Assert.assertEquals;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
/**
* @author ollivir
*/
public class GarbageCollectionMetricsTest {
@Test
public void gc_metrics_are_collected_in_a_sliding_window() {
ManualClock clock = new ManualClock();
Metric metric = mock(Metric.class);
int garbageCollectors = ManagementFactory.getGarbageCollectorMXBeans().size();
Duration interval = GarbageCollectionMetrics.REPORTING_INTERVAL;
GarbageCollectionMetrics garbageCollectionMetrics = new GarbageCollectionMetrics(clock);
assertEquals(garbageCollectors, garbageCollectionMetrics.getGcStatistics().keySet().size());
clock.advance(interval.minus(Duration.ofMillis(10)));
garbageCollectionMetrics.emitMetrics(metric);
assertWindowLengths(garbageCollectionMetrics, 2);
clock.advance(Duration.ofMillis(10));
garbageCollectionMetrics.emitMetrics(metric);
assertWindowLengths(garbageCollectionMetrics, 3);
clock.advance(Duration.ofMillis(10));
garbageCollectionMetrics.emitMetrics(metric);
assertWindowLengths(garbageCollectionMetrics, 3);
clock.advance(interval);
garbageCollectionMetrics.emitMetrics(metric);
assertWindowLengths(garbageCollectionMetrics, 2);
verify(metric, times(garbageCollectors * 4 * 2)).set(anyString(), any(), any());
}
private static void assertWindowLengths(GarbageCollectionMetrics gcm, int count) {
for(LinkedList<GarbageCollectionMetrics.GcStats> window: gcm.getGcStatistics().values()) {
assertEquals(count, window.size());
}
}
}
|