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.server.metrics;
  
  import com.yammer.metrics.core.MetricName;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.LinkedHashMap;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  class KafkaYammerMetricsTest {
  
      @Test
      public void testUntaggedMetric() {
          MetricName metricName = KafkaYammerMetrics.getMetricName(
              "kafka.metrics",
              "TestMetrics",
              "UntaggedMetric"
          );
  
          assertEquals("kafka.metrics", metricName.getGroup());
          assertEquals("TestMetrics", metricName.getType());
          assertEquals("UntaggedMetric", metricName.getName());
          assertEquals("kafka.metrics:type=TestMetrics,name=UntaggedMetric",
              metricName.getMBeanName());
          assertNull(metricName.getScope());
      }
  
      @Test
      public void testTaggedMetricName() {
          LinkedHashMap<String, String> tags = new LinkedHashMap<>();
          tags.put("foo", "bar");
          tags.put("bar", "baz");
          tags.put("baz", "raz.taz");
  
          MetricName metricName = KafkaYammerMetrics.getMetricName(
              "kafka.metrics",
              "TestMetrics",
              "TaggedMetric",
              tags
          );
  
          assertEquals("kafka.metrics", metricName.getGroup());
          assertEquals("TestMetrics", metricName.getType());
          assertEquals("TaggedMetric", metricName.getName());
  
          // MBean name should preserve initial ordering
          assertEquals("kafka.metrics:type=TestMetrics,name=TaggedMetric,foo=bar,bar=baz,baz=raz.taz",
              metricName.getMBeanName());
  
          // Scope should be sorted by key
          assertEquals("bar.baz.baz.raz_taz.foo.bar", metricName.getScope());
      }
  
      @Test
      public void testTaggedMetricNameWithEmptyValue() {
          LinkedHashMap<String, String> tags = new LinkedHashMap<>();
          tags.put("foo", "bar");
          tags.put("bar", "");
          tags.put("baz", "raz.taz");
  
          MetricName metricName = KafkaYammerMetrics.getMetricName(
              "kafka.metrics",
              "TestMetrics",
              "TaggedMetric",
              tags
          );
  
          assertEquals("kafka.metrics", metricName.getGroup());
          assertEquals("TestMetrics", metricName.getType());
          assertEquals("TaggedMetric", metricName.getName());
  
          // MBean name should preserve initial ordering (with empty key value removed)
          assertEquals("kafka.metrics:type=TestMetrics,name=TaggedMetric,foo=bar,baz=raz.taz",
              metricName.getMBeanName());
  
          // Scope should be sorted by key (with empty key value removed)
          assertEquals("baz.raz_taz.foo.bar", metricName.getScope());
      }
  
  }