content: /*
   * 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.kafka.common.metrics;
  
  import org.apache.kafka.common.MetricName;
  import org.apache.kafka.common.metrics.stats.WindowedCount;
  import org.apache.kafka.common.metrics.stats.WindowedSum;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.lang.management.ManagementFactory;
  import java.util.List;
  
  import javax.management.Attribute;
  import javax.management.AttributeList;
  import javax.management.AttributeNotFoundException;
  import javax.management.MBeanServer;
  import javax.management.ObjectName;
  import javax.management.RuntimeMBeanException;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.fail;
  
  public class KafkaMbeanTest {
  
      private final MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
      private Sensor sensor;
      private MetricName countMetricName;
      private MetricName sumMetricName;
      private Metrics metrics;
  
      @BeforeEach
      public void setup() throws Exception {
          metrics = new Metrics();
          metrics.addReporter(new JmxReporter());
          sensor = metrics.sensor("kafka.requests");
          countMetricName = metrics.metricName("pack.bean1.count", "grp1");
          sensor.add(countMetricName, new WindowedCount());
          sumMetricName = metrics.metricName("pack.bean1.sum", "grp1");
          sensor.add(sumMetricName, new WindowedSum());
      }
  
      @AfterEach
      public void tearDown() {
          metrics.close();
      }
  
      @Test
      public void testGetAttribute() throws Exception {
          sensor.record(2.5);
          Object counterAttribute = getAttribute(countMetricName);
          assertEquals(1.0, counterAttribute);
          Object sumAttribute = getAttribute(sumMetricName);
          assertEquals(2.5, sumAttribute);
      }
  
      @Test
      public void testGetAttributeUnknown() throws Exception {
          sensor.record(2.5);
          try {
              getAttribute(sumMetricName, "name");
              fail("Should have gotten attribute not found");
          } catch (AttributeNotFoundException e) {
              // Expected
          }
      }
  
      @Test
      public void testGetAttributes() throws Exception {
          sensor.record(3.5);
          sensor.record(4.0);
          AttributeList attributeList = getAttributes(countMetricName, countMetricName.name(), sumMetricName.name());
          List<Attribute> attributes = attributeList.asList();
          assertEquals(2, attributes.size());
          for (Attribute attribute : attributes) {
              if (countMetricName.name().equals(attribute.getName()))
                  assertEquals(2.0, attribute.getValue());
              else if (sumMetricName.name().equals(attribute.getName()))
                  assertEquals(7.5, attribute.getValue());
              else
                  fail("Unexpected attribute returned: " + attribute.getName());
          }
      }
  
      @Test
      public void testGetAttributesWithUnknown() throws Exception {
          sensor.record(3.5);
          sensor.record(4.0);
          AttributeList attributeList = getAttributes(countMetricName, countMetricName.name(),
                  sumMetricName.name(), "name");
          List<Attribute> attributes = attributeList.asList();
          assertEquals(2, attributes.size());
          for (Attribute attribute : attributes) {
              if (countMetricName.name().equals(attribute.getName()))
                  assertEquals(2.0, attribute.getValue());
              else if (sumMetricName.name().equals(attribute.getName()))
                  assertEquals(7.5, attribute.getValue());
              else
                  fail("Unexpected attribute returned: " + attribute.getName());
          }
      }
  
      @Test
      public void testInvoke() {
          RuntimeMBeanException e = assertThrows(RuntimeMBeanException.class,
              () -> mBeanServer.invoke(objectName(countMetricName), "something", null, null));
          assertEquals(UnsupportedOperationException.class, e.getCause().getClass());
      }
  
      @Test
      public void testSetAttribute() {
          RuntimeMBeanException e = assertThrows(RuntimeMBeanException.class,
              () -> mBeanServer.setAttribute(objectName(countMetricName), new Attribute("anything", 1)));
          assertEquals(UnsupportedOperationException.class, e.getCause().getClass());
      }
  
      @Test
      public void testSetAttributes() {
          RuntimeMBeanException e = assertThrows(RuntimeMBeanException.class,
              () -> mBeanServer.setAttributes(objectName(countMetricName), new AttributeList(1)));
          assertEquals(UnsupportedOperationException.class, e.getCause().getClass());
      }
  
      private ObjectName objectName(MetricName metricName) throws Exception {
          return new ObjectName(JmxReporter.getMBeanName("", metricName));
      }
  
      private Object getAttribute(MetricName metricName, String attribute) throws Exception {
          return mBeanServer.getAttribute(objectName(metricName), attribute);
      }
  
      private Object getAttribute(MetricName metricName) throws Exception {
          return getAttribute(metricName, metricName.name());
      }
  
      private AttributeList getAttributes(MetricName metricName, String... attributes) throws Exception {
          return mBeanServer.getAttributes(objectName(metricName), attributes);
      }
  
  }
  