001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.util;
019
020import static org.junit.jupiter.api.Assertions.assertEquals;
021import static org.junit.jupiter.api.Assertions.assertNotNull;
022import static org.junit.jupiter.api.Assertions.assertNull;
023
024import java.lang.management.GarbageCollectorMXBean;
025import java.lang.management.ManagementFactory;
026import java.util.Hashtable;
027import java.util.List;
028import java.util.Map;
029import javax.management.MalformedObjectNameException;
030import javax.management.ObjectName;
031import javax.management.openmbean.CompositeData;
032import org.apache.hadoop.hbase.testclassification.MiscTests;
033import org.apache.hadoop.hbase.testclassification.SmallTests;
034import org.junit.jupiter.api.Tag;
035import org.junit.jupiter.api.Test;
036import org.slf4j.Logger;
037import org.slf4j.LoggerFactory;
038
039@Tag(MiscTests.TAG)
040@Tag(SmallTests.TAG)
041public class TestJSONMetricUtil {
042
043  private static final Logger LOG = LoggerFactory.getLogger(TestJSONMetricUtil.class);
044
045  @Test
046  public void testBuildHashtable() {
047    String[] keys = { "type", "name" };
048    String[] emptyKey = {};
049    String[] values = { "MemoryPool", "Par Eden Space" };
050    String[] values2 = { "MemoryPool", "Par Eden Space", "Test" };
051    String[] emptyValue = {};
052    Map<String, String> properties = JSONMetricUtil.buldKeyValueTable(keys, values);
053    assertEquals(values[0], properties.get("type"));
054    assertEquals(values[1], properties.get("name"));
055
056    assertNull(JSONMetricUtil.buldKeyValueTable(keys, values2));
057    assertNull(JSONMetricUtil.buldKeyValueTable(keys, emptyValue));
058    assertNull(JSONMetricUtil.buldKeyValueTable(emptyKey, values2));
059    assertNull(JSONMetricUtil.buldKeyValueTable(emptyKey, emptyValue));
060  }
061
062  @Test
063  public void testBuildObjectName() throws MalformedObjectNameException {
064    String[] keys = { "type", "name" };
065    String[] values = { "MemoryPool", "Par Eden Space" };
066    Hashtable<String, String> properties = JSONMetricUtil.buldKeyValueTable(keys, values);
067    ObjectName testObject =
068      JSONMetricUtil.buildObjectName(JSONMetricUtil.JAVA_LANG_DOMAIN, properties);
069    assertEquals(JSONMetricUtil.JAVA_LANG_DOMAIN, testObject.getDomain());
070    assertEquals(testObject.getKeyPropertyList(), properties);
071  }
072
073  @Test
074  public void testGetLastGCInfo() {
075    List<GarbageCollectorMXBean> gcBeans = ManagementFactory.getGarbageCollectorMXBeans();
076    for (GarbageCollectorMXBean bean : gcBeans) {
077      ObjectName on = bean.getObjectName();
078      Object value = JSONMetricUtil.getValueFromMBean(on, "LastGcInfo");
079      LOG.info("Collector Info: " + value);
080      if (value != null && value instanceof CompositeData) {
081        CompositeData cds = (CompositeData) value;
082        assertNotNull(cds.get("duration"));
083      }
084    }
085  }
086}