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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.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.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);
assertThat(garbageCollectionMetrics.getGcStatistics().keySet().size(), is(garbageCollectors));
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()) {
assertThat(window.size(), is(count));
}
}
}
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