/*
* Copyright 2016-present Facebook, 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.facebook.buck.counters;
import com.google.common.collect.ImmutableMap;
import java.util.Map;
import java.util.Optional;
import org.junit.Assert;
import org.junit.Test;
public class SamplingCounterTest {
private static final String CATEGORY = "Counter_Category";
private static final String NAME = "Counter_Name";
public static final ImmutableMap<String, String> TAGS =
ImmutableMap.of("My super Tag Key", "And the according value!");
@Test
public void testAddSample() {
SamplingCounter counter = createCounter();
counter.addSample(63);
counter.addSample(42);
counter.addSample(21);
Assert.assertEquals(42, counter.getAverage());
Assert.assertEquals(21, counter.getMin());
Assert.assertEquals(63, counter.getMax());
Assert.assertEquals(3, counter.getCount());
}
@Test
public void testReset() {
SamplingCounter counter = createCounter();
Assert.assertEquals(0, counter.getCount());
counter.addSample(84);
Assert.assertEquals(1, counter.getCount());
counter.flush();
Assert.assertEquals(0, counter.getCount());
}
@Test
public void testSnapshot() {
SamplingCounter counter = createCounter();
counter.addSample(42);
Optional<CounterSnapshot> snapshot = counter.flush();
Assert.assertTrue(snapshot.isPresent());
checkSnapshot(snapshot.get(), 42);
counter.addSample(21);
Optional<CounterSnapshot> snapshot2 = counter.flush();
Assert.assertTrue(snapshot2.isPresent());
checkSnapshot(snapshot2.get(), 21);
}
@Test
public void testSnapshotWithoutSamples() {
SamplingCounter counter = createCounter();
Optional<CounterSnapshot> snapshot = counter.flush();
Assert.assertFalse(snapshot.isPresent());
}
private void checkSnapshot(CounterSnapshot snapshot, long expectedValue) {
Assert.assertEquals(4, snapshot.getValues().size());
boolean atLeastOneExpectedValueFound = false;
for (Map.Entry<String, Long> entry : snapshot.getValues().entrySet()) {
Assert.assertTrue(entry.getKey().startsWith(NAME));
Assert.assertNotEquals(0, (long) entry.getValue());
if (expectedValue == entry.getValue()) {
atLeastOneExpectedValueFound = true;
}
}
Assert.assertTrue(atLeastOneExpectedValueFound);
Assert.assertEquals(TAGS.size(), snapshot.getTags().size());
Assert.assertTrue(snapshot.getTags().containsKey(TAGS.keySet().toArray()[0]));
Assert.assertEquals(CATEGORY, snapshot.getCategory());
}
private SamplingCounter createCounter() {
return new SamplingCounter(CATEGORY, NAME, TAGS);
}
}