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.internals;
  
  import org.apache.kafka.common.MetricName;
  import org.apache.kafka.common.metrics.Measurable;
  import org.apache.kafka.common.metrics.Metrics;
  import org.apache.kafka.common.metrics.Sensor;
  import org.apache.kafka.common.metrics.stats.Max;
  import org.apache.kafka.common.metrics.stats.Rate;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class PluginMetricsImplTest {
  
      private static final LinkedHashMap<String, String> EXTRA_TAGS = new LinkedHashMap<>();
      private Map<String, String> tags;
      private Metrics metrics;
      private int initialMetrics;
  
      static {
          EXTRA_TAGS.put("my-tag", "my-value");
      }
  
      @BeforeEach
      void setup() {
          metrics = new Metrics();
          initialMetrics = metrics.metrics().size();
          tags = new LinkedHashMap<>();
          tags.put("k1", "v1");
          tags.put("k2", "v2");
      }
  
      @Test
      void testMetricName() {
          PluginMetricsImpl pmi = new PluginMetricsImpl(metrics, tags);
          MetricName metricName = pmi.metricName("name", "description", EXTRA_TAGS);
          assertEquals("name", metricName.name());
          assertEquals("plugins", metricName.group());
          assertEquals("description", metricName.description());
          Map<String, String> expectedTags = new LinkedHashMap<>(tags);
          expectedTags.putAll(EXTRA_TAGS);
          assertEquals(expectedTags, metricName.tags());
      }
  
      @Test
      void testDuplicateTagName() {
          PluginMetricsImpl pmi = new PluginMetricsImpl(metrics, tags);
          LinkedHashMap<String, String> tags = new LinkedHashMap<>();
          tags.put("k1", "value");
          assertThrows(IllegalArgumentException.class,
                  () -> pmi.metricName("name", "description", tags));
      }
  
      @Test
      void testAddRemoveMetrics() {
          PluginMetricsImpl pmi = new PluginMetricsImpl(metrics, tags);
          MetricName metricName = pmi.metricName("name", "description", EXTRA_TAGS);
          pmi.addMetric(metricName, (Measurable) (config, now) -> 0.0);
          assertEquals(initialMetrics + 1, metrics.metrics().size());
  
          assertThrows(IllegalArgumentException.class, () -> pmi.addMetric(metricName, (Measurable) (config, now) -> 0.0));
  
          pmi.removeMetric(metricName);
          assertEquals(initialMetrics, metrics.metrics().size());
  
          assertThrows(IllegalArgumentException.class, () -> pmi.removeMetric(metricName));
      }
  
      @Test
      void testAddRemoveSensor() {
          PluginMetricsImpl pmi = new PluginMetricsImpl(metrics, tags);
          String sensorName = "my-sensor";
          MetricName metricName = pmi.metricName("name", "description", EXTRA_TAGS);
          Sensor sensor = pmi.addSensor(sensorName);
          assertEquals(initialMetrics, metrics.metrics().size());
          sensor.add(metricName, new Rate());
          sensor.add(metricName, new Max());
          assertEquals(initialMetrics + 1, metrics.metrics().size());
  
          assertThrows(IllegalArgumentException.class, () -> pmi.addSensor(sensorName));
  
          pmi.removeSensor(sensorName);
          assertEquals(initialMetrics, metrics.metrics().size());
  
          assertThrows(IllegalArgumentException.class, () -> pmi.removeSensor(sensorName));
      }
  
      @Test
      void testClose() throws IOException {
          PluginMetricsImpl pmi = new PluginMetricsImpl(metrics, tags);
          String sensorName = "my-sensor";
          MetricName metricName1 = pmi.metricName("name1", "description", EXTRA_TAGS);
          Sensor sensor = pmi.addSensor(sensorName);
          sensor.add(metricName1, new Rate());
          MetricName metricName2 = pmi.metricName("name2", "description", EXTRA_TAGS);
          pmi.addMetric(metricName2, (Measurable) (config, now) -> 1.0);
  
          assertEquals(initialMetrics + 2, metrics.metrics().size());
          pmi.close();
          assertEquals(initialMetrics, metrics.metrics().size());
      }
  }
  