/*
* Copyright 2012-2017 the original author or authors.
*
* 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 org.springframework.boot.actuate.metrics.dropwizard;
import java.util.ArrayList;
import java.util.List;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import com.codahale.metrics.UniformReservoir;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.springframework.test.util.ReflectionTestUtils;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.BDDMockito.given;
/**
* Tests for {@link DropwizardMetricServices}.
*
* @author Dave Syer
* @author Lucas Saldanha
*/
public class DropwizardMetricServicesTests {
private MetricRegistry registry = new MetricRegistry();
@Mock
private ReservoirFactory reservoirFactory;
private DropwizardMetricServices writer;
@Before
public void setup() {
MockitoAnnotations.initMocks(this);
this.writer = new DropwizardMetricServices(this.registry, this.reservoirFactory);
}
@Test
public void incrementCounter() {
this.writer.increment("foo");
this.writer.increment("foo");
this.writer.increment("foo");
assertThat(this.registry.counter("counter.foo").getCount()).isEqualTo(3);
}
@Test
public void updatePredefinedMeter() {
this.writer.increment("meter.foo");
this.writer.increment("meter.foo");
this.writer.increment("meter.foo");
assertThat(this.registry.meter("meter.foo").getCount()).isEqualTo(3);
}
@Test
public void updatePredefinedCounter() {
this.writer.increment("counter.foo");
this.writer.increment("counter.foo");
this.writer.increment("counter.foo");
assertThat(this.registry.counter("counter.foo").getCount()).isEqualTo(3);
}
@Test
public void setGauge() {
this.writer.submit("foo", 2.1);
@SuppressWarnings("unchecked")
Gauge<Double> gauge = (Gauge<Double>) this.registry.getMetrics().get("gauge.foo");
assertThat(gauge.getValue()).isEqualTo(new Double(2.1));
this.writer.submit("foo", 2.3);
assertThat(gauge.getValue()).isEqualTo(new Double(2.3));
}
@Test
public void setPredefinedTimer() {
this.writer.submit("timer.foo", 200);
this.writer.submit("timer.foo", 300);
assertThat(this.registry.timer("timer.foo").getCount()).isEqualTo(2);
}
@Test
public void setCustomReservoirTimer() {
given(this.reservoirFactory.getReservoir(anyString()))
.willReturn(new UniformReservoir());
this.writer.submit("timer.foo", 200);
this.writer.submit("timer.foo", 300);
assertThat(this.registry.timer("timer.foo").getCount()).isEqualTo(2);
Timer timer = (Timer) this.registry.getMetrics().get("timer.foo");
Histogram histogram = (Histogram) ReflectionTestUtils.getField(timer,
"histogram");
assertThat(ReflectionTestUtils.getField(histogram, "reservoir").getClass()
.equals(UniformReservoir.class)).isTrue();
}
@Test
public void setPredefinedHistogram() {
this.writer.submit("histogram.foo", 2.1);
this.writer.submit("histogram.foo", 2.3);
assertThat(this.registry.histogram("histogram.foo").getCount()).isEqualTo(2);
}
@Test
public void setCustomReservoirHistogram() {
given(this.reservoirFactory.getReservoir(anyString()))
.willReturn(new UniformReservoir());
this.writer.submit("histogram.foo", 2.1);
this.writer.submit("histogram.foo", 2.3);
assertThat(this.registry.histogram("histogram.foo").getCount()).isEqualTo(2);
assertThat(ReflectionTestUtils
.getField(this.registry.getMetrics().get("histogram.foo"), "reservoir")
.getClass().equals(UniformReservoir.class)).isTrue();
}
/**
* Test the case where a given writer is used amongst several threads where each
* thread is updating the same set of metrics. This would be an example case of the
* writer being used with the MetricsFilter handling several requests/sec to the same
* URL.
* @throws Exception if an error occurs
*/
@Test
public void testParallelism() throws Exception {
List<WriterThread> threads = new ArrayList<>();
ThreadGroup group = new ThreadGroup("threads");
for (int i = 0; i < 10; i++) {
WriterThread thread = new WriterThread(group, i, this.writer);
threads.add(thread);
thread.start();
}
while (group.activeCount() > 0) {
Thread.sleep(1000);
}
for (WriterThread thread : threads) {
assertThat(thread.isFailed())
.as("expected thread caused unexpected exception").isFalse();
}
}
public static class WriterThread extends Thread {
private int index;
private boolean failed;
private DropwizardMetricServices writer;
public WriterThread(ThreadGroup group, int index,
DropwizardMetricServices writer) {
super(group, "Writer-" + index);
this.index = index;
this.writer = writer;
}
public boolean isFailed() {
return this.failed;
}
@Override
public void run() {
for (int i = 0; i < 10000; i++) {
try {
this.writer.submit("timer.test.service", this.index);
this.writer.submit("histogram.test.service", this.index);
this.writer.submit("gauge.test.service", this.index);
}
catch (IllegalArgumentException ex) {
this.failed = true;
throw ex;
}
}
}
}
}