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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.server.jetty;
import com.yahoo.jdisc.http.ConnectorConfig;
import org.eclipse.jetty.server.AbstractConnector;
import org.eclipse.jetty.util.component.AbstractLifeCycle;
import org.eclipse.jetty.util.statistic.RateStatistic;
import org.eclipse.jetty.util.thread.Scheduler;
import org.junit.Test;
import java.util.concurrent.TimeUnit;
import static org.junit.Assert.assertNotNull;
import static org.mockito.ArgumentMatchers.anyBoolean;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import static org.mockito.internal.verification.VerificationModeFactory.times;
/**
* @author bjorncs
*/
public class ConnectionThrottlerTest {
@Test
public void throttles_when_any_resource_check_exceeds_configured_threshold() {
Runtime runtime = mock(Runtime.class);
when(runtime.maxMemory()).thenReturn(100l);
RateStatistic rateStatistic = new RateStatistic(1, TimeUnit.HOURS);
MockScheduler scheduler = new MockScheduler();
ConnectorConfig.Throttling config = new ConnectorConfig.Throttling(new ConnectorConfig.Throttling.Builder()
.maxHeapUtilization(0.8)
.maxAcceptRate(1));
AbstractConnector connector = mock(AbstractConnector.class);
ConnectionThrottler throttler = new ConnectionThrottler(runtime, rateStatistic, scheduler, connector, config);
// Heap utilization above configured threshold, but connection rate below threshold.
when(runtime.freeMemory()).thenReturn(10l);
when(connector.isAccepting()).thenReturn(true);
throttler.onAccepting(null);
assertNotNull(scheduler.task);
verify(connector).setAccepting(false);
// Heap utilization below threshold, but connection rate above threshold.
when(runtime.freeMemory()).thenReturn(80l);
rateStatistic.record();
rateStatistic.record(); // above accept rate limit (2 > 1)
scheduler.task.run(); // run unthrottleIfBelowThresholds()
verify(connector, times(1)).setAccepting(anyBoolean()); // verify setAccepting has not been called any mores times
// Both heap utilization and accept rate below threshold
when(runtime.freeMemory()).thenReturn(80l);
when(connector.isAccepting()).thenReturn(false);
rateStatistic.reset();
scheduler.task.run(); // run unthrottleIfBelowThresholds()
verify(connector).setAccepting(true);
// Both heap utilization and accept rate below threshold
when(connector.isAccepting()).thenReturn(true);
when(runtime.freeMemory()).thenReturn(80l);
rateStatistic.record();
throttler.onAccepting(null);
verify(connector, times(2)).setAccepting(anyBoolean()); // verify setAccepting has not been called any mores times
}
private static class MockScheduler extends AbstractLifeCycle implements Scheduler {
Runnable task;
@Override
public Task schedule(Runnable task, long delay, TimeUnit units) {
this.task = task;
return () -> false;
}
}
}
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