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.streams.internals.metrics;
  
  import org.apache.kafka.clients.consumer.MockConsumer;
  import org.apache.kafka.clients.consumer.internals.AutoOffsetResetStrategy;
  import org.apache.kafka.common.MetricName;
  import org.apache.kafka.common.metrics.KafkaMetric;
  import org.apache.kafka.common.metrics.Measurable;
  import org.apache.kafka.common.metrics.MetricConfig;
  import org.apache.kafka.common.utils.Time;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  class StreamsThreadMetricsDelegatingReporterTest {
  
      private MockConsumer<byte[], byte[]> mockConsumer;
      private StreamsThreadMetricsDelegatingReporter streamsThreadMetricsDelegatingReporter;
  
      private KafkaMetric kafkaMetricOneHasThreadIdTag;
      private KafkaMetric kafkaMetricTwoHasThreadIdTag;
      private KafkaMetric kafkaMetricThreeHasThreadIdTag;
      private KafkaMetric kafkaMetricWithoutThreadIdTag;
      private final Object lock = new Object();
      private final MetricConfig metricConfig = new MetricConfig();
  
  
      @BeforeEach
      public void setUp() {
          final Map<String, String> threadIdTagMap = new HashMap<>();
          final String threadId = "abcxyz-StreamThread-1";
          threadIdTagMap.put("thread-id", threadId);
  
          final Map<String, String> threadIdWithStateUpdaterTagMap = new HashMap<>();
          final String stateUpdaterId = "deftuv-StateUpdater-1";
          threadIdWithStateUpdaterTagMap.put("thread-id", stateUpdaterId);
  
          final Map<String, String> noThreadIdTagMap = new HashMap<>();
          noThreadIdTagMap.put("client-id", "foo");
  
          mockConsumer = new MockConsumer<>(AutoOffsetResetStrategy.NONE.name());
          streamsThreadMetricsDelegatingReporter = new StreamsThreadMetricsDelegatingReporter(mockConsumer, threadId, Optional.of(stateUpdaterId));
  
          final MetricName metricNameOne = new MetricName("metric-one", "test-group-one", "foo bar baz", threadIdTagMap);
          final MetricName metricNameTwo = new MetricName("metric-two", "test-group-two", "description two", threadIdWithStateUpdaterTagMap);
          final MetricName metricNameThree = new MetricName("metric-three", "test-group-three", "description three", threadIdTagMap);
          final MetricName metricNameFour = new MetricName("metric-four", "test-group-three", "description three", noThreadIdTagMap);
  
          kafkaMetricOneHasThreadIdTag = new KafkaMetric(lock, metricNameOne, (Measurable) (m, now) -> 1.0, metricConfig, Time.SYSTEM);
          kafkaMetricTwoHasThreadIdTag = new KafkaMetric(lock, metricNameTwo, (Measurable) (m, now) -> 2.0, metricConfig, Time.SYSTEM);
          kafkaMetricThreeHasThreadIdTag = new KafkaMetric(lock, metricNameThree, (Measurable) (m, now) -> 3.0, metricConfig, Time.SYSTEM);
          kafkaMetricWithoutThreadIdTag = new KafkaMetric(lock, metricNameFour, (Measurable) (m, now) -> 4.0, metricConfig, Time.SYSTEM);
      }
  
      @AfterEach
      public void tearDown() {
          mockConsumer.close();
      }
  
  
      @Test
      public void shouldInitMetrics() {
          final List<KafkaMetric> allMetrics = Arrays.asList(kafkaMetricOneHasThreadIdTag, kafkaMetricTwoHasThreadIdTag, kafkaMetricThreeHasThreadIdTag);
          final List<KafkaMetric> expectedMetrics = Arrays.asList(kafkaMetricOneHasThreadIdTag, kafkaMetricTwoHasThreadIdTag, kafkaMetricThreeHasThreadIdTag);
          streamsThreadMetricsDelegatingReporter.init(allMetrics);
          assertEquals(expectedMetrics, mockConsumer.addedMetrics(),
              "Init method should register metrics it receives as parameters");
      }
  
      @Test
      public void shouldRegisterMetrics() {
          streamsThreadMetricsDelegatingReporter.metricChange(kafkaMetricOneHasThreadIdTag);
          assertEquals(kafkaMetricOneHasThreadIdTag, mockConsumer.addedMetrics().get(0),
              "Should register metrics with thread-id in tag map");
      }
  
      @Test
      public void shouldRemoveMetrics() {
          streamsThreadMetricsDelegatingReporter.metricChange(kafkaMetricOneHasThreadIdTag);
          streamsThreadMetricsDelegatingReporter.metricChange(kafkaMetricTwoHasThreadIdTag);
          streamsThreadMetricsDelegatingReporter.metricChange(kafkaMetricThreeHasThreadIdTag);
          List<KafkaMetric> expected = Arrays.asList(kafkaMetricOneHasThreadIdTag, kafkaMetricTwoHasThreadIdTag, kafkaMetricThreeHasThreadIdTag);
          assertEquals(expected, mockConsumer.addedMetrics());
          streamsThreadMetricsDelegatingReporter.metricRemoval(kafkaMetricOneHasThreadIdTag);
          expected = Arrays.asList(kafkaMetricTwoHasThreadIdTag, kafkaMetricThreeHasThreadIdTag);
          assertEquals(expected, mockConsumer.addedMetrics(),
              "Should remove metrics");
      }
  
      @Test
      public void shouldNotRegisterMetricsWithoutThreadIdTag() {
          streamsThreadMetricsDelegatingReporter.metricChange(kafkaMetricWithoutThreadIdTag);
          assertEquals(0, mockConsumer.addedMetrics().size(),
              "Should not register metrics without thread-id tag");
      }
  }