| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.cassandra.metrics; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import org.junit.Test; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| |
| public class LatencyMetricsTest |
| { |
| private final MetricNameFactory factory = new TestMetricsNameFactory(); |
| |
| private class TestMetricsNameFactory implements MetricNameFactory |
| { |
| |
| @Override |
| public CassandraMetricsRegistry.MetricName createMetricName(String metricName) |
| { |
| return new CassandraMetricsRegistry.MetricName(TestMetricsNameFactory.class, metricName); |
| } |
| } |
| |
| /** |
| * Test bitsets in a "real-world" environment, i.e., bloom filters |
| */ |
| @Test |
| public void testGetRecentLatency() |
| { |
| final LatencyMetrics l = new LatencyMetrics("test", "test"); |
| Runnable r = () -> { |
| for (int i = 0; i < 10000; i++) |
| { |
| l.addNano(1000); |
| } |
| }; |
| new Thread(r).start(); |
| |
| for (int i = 0; i < 10000; i++) |
| { |
| Double recent = l.latency.getOneMinuteRate(); |
| assertFalse(recent.equals(Double.POSITIVE_INFINITY)); |
| } |
| } |
| |
| /** |
| * Test that parent LatencyMetrics are receiving updates from child metrics when reading |
| */ |
| @Test |
| public void testReadMerging() |
| { |
| final LatencyMetrics parent = new LatencyMetrics("testMerge", "testMerge"); |
| final LatencyMetrics child = new LatencyMetrics(factory, "testChild", parent); |
| |
| for (int i = 0; i < 100; i++) |
| { |
| child.addNano(TimeUnit.NANOSECONDS.convert(i, TimeUnit.MILLISECONDS)); |
| } |
| |
| assertEquals(4950000, child.totalLatency.getCount()); |
| assertEquals(child.totalLatency.getCount(), parent.totalLatency.getCount()); |
| assertEquals(child.latency.getSnapshot().getMean(), parent.latency.getSnapshot().getMean(), 50D); |
| |
| child.release(); |
| parent.release(); |
| } |
| |
| @Test |
| public void testRelease() |
| { |
| final LatencyMetrics parent = new LatencyMetrics("testRelease", "testRelease"); |
| final LatencyMetrics child = new LatencyMetrics(factory, "testChildRelease", parent); |
| |
| for (int i = 0; i < 100; i++) |
| { |
| child.addNano(TimeUnit.NANOSECONDS.convert(i, TimeUnit.MILLISECONDS)); |
| } |
| |
| double mean = parent.latency.getSnapshot().getMean(); |
| long count = parent.totalLatency.getCount(); |
| |
| child.release(); |
| |
| // Check that no value was lost with the release |
| assertEquals(count, parent.totalLatency.getCount()); |
| assertEquals(mean, parent.latency.getSnapshot().getMean(), 50D); |
| |
| parent.release(); |
| } |
| } |