/**
* Copyright © 2013 Antonin Stefanutti (antonin.stefanutti@gmail.com)
*
* 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 io.astefanutti.metrics.cdi.se;
import com.codahale.metrics.Counter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.annotation.Metric;
import org.hamcrest.Matchers;
import org.jboss.arquillian.container.test.api.Deployment;
import org.jboss.arquillian.junit.Arquillian;
import org.jboss.arquillian.junit.InSequence;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.ShrinkWrap;
import org.jboss.shrinkwrap.api.asset.EmptyAsset;
import org.jboss.shrinkwrap.api.spec.JavaArchive;
import org.junit.Test;
import org.junit.runner.RunWith;
import io.astefanutti.metrics.cdi.MetricsExtension;
import javax.inject.Inject;
import java.util.concurrent.Callable;
import java.util.concurrent.Exchanger;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.hasKey;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail;
@RunWith(Arquillian.class)
public class MonotonicCountedMethodBeanTest {
private final static String COUNTER_NAME = "monotonicCountedMethod";
private final static AtomicLong COUNTER_COUNT = new AtomicLong();
@Deployment
static Archive<?> createTestArchive() {
return ShrinkWrap.create(JavaArchive.class)
// Test bean
.addClass(MonotonicCountedMethodBean.class)
// Metrics CDI extension
.addPackage(MetricsExtension.class.getPackage())
// Bean archive deployment descriptor
.addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml");
}
@Inject
private MetricRegistry registry;
@Inject
private MonotonicCountedMethodBean<Long> bean;
@Test
@InSequence(1)
public void countedMethodNotCalledYet() {
assertThat("Counter is not registered correctly", registry.getCounters(), hasKey(COUNTER_NAME));
Counter counter = registry.getCounters().get(COUNTER_NAME);
// Make sure that the counter hasn't been called yet
assertThat("Counter count is incorrect", counter.getCount(), is(equalTo(COUNTER_COUNT.get())));
}
@Test
@InSequence(2)
public void countedMethodNotCalledYet(@Metric(name = "monotonicCountedMethod", absolute = true) Counter instance) {
assertThat("Counter is not registered correctly", registry.getCounters(), hasKey(COUNTER_NAME));
Counter counter = registry.getCounters().get(COUNTER_NAME);
// Make sure that the counter registered and the bean instance are the same
assertThat("Counter and bean instance are not equal", instance, is(equalTo(counter)));
}
@Test
@InSequence(3)
public void callCountedMethodOnce() throws InterruptedException, TimeoutException {
assertThat("Counter is not registered correctly", registry.getCounters(), hasKey(COUNTER_NAME));
Counter counter = registry.getCounters().get(COUNTER_NAME);
// Call the counted method, block and assert it's been counted
final Exchanger<Long> exchanger = new Exchanger<>();
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try {
exchanger.exchange(bean.monotonicCountedMethod(new Callable<Long>() {
@Override
public Long call() throws Exception {
exchanger.exchange(0L);
return exchanger.exchange(0L);
}
}));
} catch (InterruptedException cause) {
throw new RuntimeException(cause);
}
}
});
final AtomicInteger uncaught = new AtomicInteger();
thread.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread t, Throwable e) {
uncaught.incrementAndGet();
}
});
thread.start();
// Wait until the method is executing and make sure that the counter has been incremented
exchanger.exchange(0L, 5L, TimeUnit.SECONDS);
assertThat("Counter count is incorrect", counter.getCount(), is(equalTo(COUNTER_COUNT.incrementAndGet())));
// Exchange the result and unblock the method execution
Long random = 1 + Math.round(Math.random() * (Long.MAX_VALUE - 1));
exchanger.exchange(random, 5L, TimeUnit.SECONDS);
// Wait until the method has returned
assertThat("Counted method return value is incorrect", exchanger.exchange(0L), is(equalTo(random)));
// Then make sure that the counter has not been decremented
assertThat("Counter count is incorrect", counter.getCount(), is(equalTo(COUNTER_COUNT.get())));
// Finally make sure calling thread is returns correctly
thread.join();
assertThat("Exception thrown in method call thread", uncaught.get(), is(equalTo(0)));
}
@Test
@InSequence(4)
public void removeMonotonicCounterFromRegistry() {
assertThat("Counter is not registered correctly", registry.getCounters(), hasKey(COUNTER_NAME));
Counter counter = registry.getCounters().get(COUNTER_NAME);
// Remove the counter from metrics registry
registry.remove(COUNTER_NAME);
try {
// Call the counted method and assert an exception is thrown
bean.monotonicCountedMethod(new Callable<Long>() {
@Override
public Long call() throws Exception {
return null;
}
});
} catch (Exception cause) {
assertThat(cause, is(Matchers.<Exception>instanceOf(IllegalStateException.class)));
assertThat(cause.getMessage(), is(equalTo("No counter with name [" + COUNTER_NAME + "] found in registry [" + registry + "]")));
// Make sure that the counter hasn't been called
assertThat("Counter count is incorrect", counter.getCount(), is(equalTo(COUNTER_COUNT.get())));
return;
}
fail("No exception has been re-thrown!");
}
}