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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.application;
import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.yahoo.jdisc.Metric;
import org.junit.jupiter.api.Test;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
* @author Simon Thoresen Hult
*/
public class MetricImplTestCase {
@Test
void requireThatClassIsInjectedByDefault() {
Metric metric = Guice.createInjector().getInstance(Metric.class);
assertTrue(metric instanceof MetricImpl);
}
@Test
void requireThatConsumerIsOptional() {
Injector injector = Guice.createInjector();
Metric metric = injector.getInstance(Metric.class);
metric.set("foo", 6, null);
metric.add("foo", 9, null);
}
@Test
void requireThatConsumerIsCalled() throws InterruptedException {
final MyConsumer consumer = new MyConsumer();
Injector injector = Guice.createInjector(new AbstractModule() {
@Override
protected void configure() {
bind(MetricConsumer.class).toInstance(consumer);
}
});
Metric metric = injector.getInstance(Metric.class);
metric.set("foo", 6, null);
assertEquals(6, consumer.map.get("foo").intValue());
metric.add("foo", 9, null);
assertEquals(15, consumer.map.get("foo").intValue());
Metric.Context ctx = metric.createContext(null);
assertEquals(consumer.ctx, ctx);
}
@Test
void requireThatWorkerMetricHasPrecedence() throws InterruptedException {
final MyConsumer globalConsumer = new MyConsumer();
Injector injector = Guice.createInjector(new AbstractModule() {
@Override
protected void configure() {
bind(MetricConsumer.class).toInstance(globalConsumer);
}
});
Metric metric = injector.getInstance(Metric.class);
MyConsumer localConsumer = new MyConsumer();
localConsumer.latchRef.set(new CountDownLatch(1));
new ContainerThread(new SetTask(metric, "foo", 6), localConsumer).start();
localConsumer.latchRef.get().await(600, TimeUnit.SECONDS);
assertEquals(6, localConsumer.map.get("foo").intValue());
assertTrue(globalConsumer.map.isEmpty());
localConsumer.latchRef.set(new CountDownLatch(1));
new ContainerThread(new AddTask(metric, "foo", 9), localConsumer).start();
localConsumer.latchRef.get().await(600, TimeUnit.SECONDS);
assertEquals(15, localConsumer.map.get("foo").intValue());
assertTrue(globalConsumer.map.isEmpty());
}
private static class SetTask implements Runnable {
final Metric metric;
final String key;
final Number val;
public SetTask(Metric metric, String key, Number val) {
this.metric = metric;
this.key = key;
this.val = val;
}
@Override
public void run() {
metric.set(key, val, null);
}
}
private static class AddTask implements Runnable {
final Metric metric;
final String key;
final Number val;
public AddTask(Metric metric, String key, Number val) {
this.metric = metric;
this.key = key;
this.val = val;
}
@Override
public void run() {
metric.add(key, val, null);
}
}
private static class MyConsumer implements MetricConsumer {
final ConcurrentMap<String, Integer> map = new ConcurrentHashMap<>();
final AtomicReference<CountDownLatch> latchRef = new AtomicReference<>();
final Metric.Context ctx = new Metric.Context() { };
@Override
public void set(String key, Number val, Metric.Context ctx) {
map.put(key, val.intValue());
CountDownLatch latch = latchRef.get();
if (latch != null) {
latch.countDown();
}
}
@Override
public void add(String key, Number val, Metric.Context ctx) {
map.put(key, map.get(key) + val.intValue());
CountDownLatch latch = this.latchRef.get();
if (latch != null) {
latch.countDown();
}
}
@Override
public Metric.Context createContext(Map<String, ?> properties) {
return ctx;
}
}
}
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