/**
* 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.hadoop.hive.common.metrics.metrics2;
import com.codahale.metrics.MetricRegistry;
import org.apache.hadoop.hive.common.metrics.MetricsTestUtils;
import org.apache.hadoop.hive.common.metrics.common.MetricsFactory;
import org.apache.hadoop.hive.common.metrics.common.MetricsVariable;
import org.apache.hadoop.hive.conf.HiveConf;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Unit test for the RatioGauge implementation.
*/
public class TestMetricVariableRatioGauge {
public static MetricRegistry metricRegistry;
@Before
public void before() throws Exception {
HiveConf conf = new HiveConf();
conf.setVar(HiveConf.ConfVars.HIVE_METRICS_CLASS, CodahaleMetrics.class.getCanonicalName());
// disable json file writing
conf.setVar(HiveConf.ConfVars.HIVE_METRICS_JSON_FILE_INTERVAL, "60000m");
MetricsFactory.init(conf);
metricRegistry = ((CodahaleMetrics) MetricsFactory.getInstance()).getMetricRegistry();
}
@After
public void after() throws Exception {
MetricsFactory.close();
}
@Test
public void testRatioIsCalculated() throws Exception {
NumericVariable num = new NumericVariable(10);
NumericVariable ord = new NumericVariable(5);
MetricsFactory.getInstance().addRatio("rat", num, ord);
String json = ((CodahaleMetrics) MetricsFactory.getInstance()).dumpJson();
MetricsTestUtils.verifyMetricsJson(json, MetricsTestUtils.GAUGE, "rat", 2d);
}
@Test
public void testRatioIsCalculatedNonExact() throws Exception {
NumericVariable num = new NumericVariable(20);
NumericVariable ord = new NumericVariable(3);
MetricsFactory.getInstance().addRatio("rat", num, ord);
String json = ((CodahaleMetrics) MetricsFactory.getInstance()).dumpJson();
MetricsTestUtils.verifyMetricsJson(json, MetricsTestUtils.GAUGE, "rat", 6.6666d, 1e-4);
}
@Test(expected = IllegalArgumentException.class)
public void testMissingNumeratorRatio() throws Exception {
MetricsFactory.getInstance().addRatio("rat", null, new NumericVariable(5));
}
@Test(expected = IllegalArgumentException.class)
public void testMissingDenominatorRatio() throws Exception {
MetricsFactory.getInstance().addRatio("rat", new NumericVariable(5), null);
}
@Test
public void testEmptyRatio() throws Exception {
NumericVariable num = new NumericVariable(null);
NumericVariable ord = new NumericVariable(null);
MetricsFactory.getInstance().addRatio("rat", num, ord);
String json = ((CodahaleMetrics) MetricsFactory.getInstance()).dumpJson();
MetricsTestUtils.verifyMetricsJson(json, MetricsTestUtils.GAUGE, "rat", "NaN");
}
@Test
public void testZeroRatio() throws Exception {
NumericVariable num = new NumericVariable(10);
NumericVariable ord = new NumericVariable(0);
MetricsFactory.getInstance().addRatio("rat", num, ord);
String json = ((CodahaleMetrics) MetricsFactory.getInstance()).dumpJson();
MetricsTestUtils.verifyMetricsJson(json, MetricsTestUtils.GAUGE, "rat", "NaN");
}
private class NumericVariable implements MetricsVariable<Integer> {
private final Integer value;
public NumericVariable(Integer value) {
this.value = value;
}
@Override
public Integer getValue() {
return value;
}
}
}