/*
* Copyright (C) 2012-2015 DataStax Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.driver.core;
import com.datastax.driver.core.exceptions.ReadTimeoutException;
import com.google.common.collect.Lists;
import com.google.common.util.concurrent.Uninterruptibles;
import org.testng.annotations.Test;
import java.util.List;
import java.util.concurrent.TimeUnit;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.mock;
public class CustomPercentileTrackerTest {
@Test(groups = "unit")
public void should_return_negative_value_when_key_cant_be_computed() {
// given - A custom tracker that returns null for a specific host and keys by host otherwise.
final Cluster cluster0 = mock(Cluster.class);
final Host host0 = mock(Host.class);
final Host host1 = mock(Host.class);
PercentileTracker tracker = new PercentileTracker(1000, 3, 100, 50) {
@Override
protected Object computeKey(Host host, Statement statement, Exception exception) {
if (host == host0) {
return host;
} else {
return null;
}
}
};
tracker.onRegister(cluster0);
List<Statement> statements = Lists.newArrayList(mock(Statement.class), mock(Statement.class));
List<Exception> exceptions = Lists.newArrayList(new Exception(), null, new ReadTimeoutException(ConsistencyLevel.ANY, 1, 1, true), null, null);
// when - recording latencies over a linear progression with varying hosts, statements and exceptions.
for (int i = 0; i < 100; i++) {
tracker.update(
host0,
statements.get(i % statements.size()),
exceptions.get(i % exceptions.size()), TimeUnit.NANOSECONDS.convert((i + 1) * 2, TimeUnit.MILLISECONDS));
tracker.update(
host1,
statements.get(i % statements.size()),
exceptions.get(i % exceptions.size()), TimeUnit.NANOSECONDS.convert(i + 1, TimeUnit.MILLISECONDS));
}
Uninterruptibles.sleepUninterruptibly(2, TimeUnit.SECONDS);
// then - host0 should return a linear progression (i*2) since it has a tracker.
// host1 should return -1 since it has no tracker since it has no key.
for (int i = 1; i <= 99; i++) {
assertThat(tracker.getLatencyAtPercentile(host0, null, null, i)).isEqualTo(i * 2);
assertThat(tracker.getLatencyAtPercentile(host1, null, null, i)).isEqualTo(-1);
}
}
}