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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.concurrent.maintenance;
import org.junit.Test;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import static org.junit.Assert.assertEquals;
/**
* @author freva
*/
public class MaintainerTest {
@Test
public void staggering() {
List<String> cluster = List.of("cfg1", "cfg2", "cfg3");
Duration interval = Duration.ofMillis(300);
Instant now = Instant.ofEpochMilli(1000);
assertEquals(200, Maintainer.staggeredDelay(interval, now, "cfg1", cluster).toMillis());
assertEquals(0, Maintainer.staggeredDelay(interval, now, "cfg2", cluster).toMillis());
assertEquals(100, Maintainer.staggeredDelay(interval, now, "cfg3", cluster).toMillis());
now = Instant.ofEpochMilli(1001);
assertEquals(199, Maintainer.staggeredDelay(interval, now, "cfg1", cluster).toMillis());
assertEquals(299, Maintainer.staggeredDelay(interval, now, "cfg2", cluster).toMillis());
assertEquals(99, Maintainer.staggeredDelay(interval, now, "cfg3", cluster).toMillis());
now = Instant.ofEpochMilli(1101);
assertEquals(99, Maintainer.staggeredDelay(interval, now, "cfg1", cluster).toMillis());
assertEquals(199, Maintainer.staggeredDelay(interval, now, "cfg2", cluster).toMillis());
assertEquals(299, Maintainer.staggeredDelay(interval, now, "cfg3", cluster).toMillis());
assertEquals(300, Maintainer.staggeredDelay(interval, now, "cfg0", cluster).toMillis());
}
@Test
public void success_metric() {
AtomicLong consecutiveFailures = new AtomicLong();
JobMetrics jobMetrics = new JobMetrics((job, count) -> consecutiveFailures.set(count));
TestMaintainer maintainer = new TestMaintainer(jobMetrics);
// Maintainer fails twice in a row
maintainer.successOnNextRun(false).run();
assertEquals(1, consecutiveFailures.get());
maintainer.successOnNextRun(false).run();
assertEquals(2, consecutiveFailures.get());
// Maintainer runs successfully
maintainer.successOnNextRun(true).run();
assertEquals(0, consecutiveFailures.get());
// Maintainer runs successfully again
maintainer.run();
assertEquals(0, consecutiveFailures.get());
// Maintainer throws
maintainer.throwOnNextRun(true).run();
assertEquals(1, consecutiveFailures.get());
// Maintainer recovers
maintainer.throwOnNextRun(false).run();
assertEquals(0, consecutiveFailures.get());
}
}
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