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.coordinator.group.metrics;
  
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.internals.Topic;
  import org.apache.kafka.common.metrics.Metrics;
  import org.apache.kafka.common.utils.LogContext;
  import org.apache.kafka.timeline.SnapshotRegistry;
  
  import com.yammer.metrics.core.MetricsRegistry;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class GroupCoordinatorMetricsShardTest {
  
      @Test
      public void testTimelineGaugeCounters() {
          MetricsRegistry registry = new MetricsRegistry();
          Metrics metrics = new Metrics();
          SnapshotRegistry snapshotRegistry = new SnapshotRegistry(new LogContext());
          TopicPartition tp = new TopicPartition(Topic.GROUP_METADATA_TOPIC_NAME, 0);
          GroupCoordinatorMetrics coordinatorMetrics = new GroupCoordinatorMetrics(registry, metrics);
          GroupCoordinatorMetricsShard shard = coordinatorMetrics.newMetricsShard(snapshotRegistry, tp);
  
          shard.incrementNumOffsets();
  
          snapshotRegistry.idempotentCreateSnapshot(1000);
          // The value should not be updated until the offset has been committed.
          assertEquals(0, shard.numOffsets());
  
          shard.commitUpTo(1000);
          assertEquals(1, shard.numOffsets());
  
          shard.decrementNumOffsets();
  
          snapshotRegistry.idempotentCreateSnapshot(2000);
          shard.commitUpTo(2000);
          assertEquals(0, shard.numOffsets());
      }
  }
  