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.cassandra.sidecar.metrics.server;
  
  import java.util.Objects;
  import java.util.function.Function;
  
  import com.codahale.metrics.DefaultSettableGauge;
  import com.codahale.metrics.Metric;
  import com.codahale.metrics.MetricRegistry;
  import org.apache.cassandra.sidecar.metrics.DeltaGauge;
  import org.apache.cassandra.sidecar.metrics.NamedMetric;
  
  import static org.apache.cassandra.sidecar.metrics.server.ServerMetrics.SERVER_PREFIX;
  
  /**
   * Tracks metrics related to cdc functionality provided by Sidecar.
   */
  public class CdcMetrics
  {
      public static final String DOMAIN = SERVER_PREFIX + ".Cdc";
      protected final MetricRegistry metricRegistry;
      public final NamedMetric<DeltaGauge> cdcRawCleanerFailed;
      public final NamedMetric<DeltaGauge> orphanedIdx;
      public final NamedMetric<DefaultSettableGauge<Integer>> oldestSegmentAge;
      public final NamedMetric<DeltaGauge> totalConsumedCdcBytes;
      public final NamedMetric<DefaultSettableGauge<Long>> totalCdcSpaceUsed;
      public final NamedMetric<DeltaGauge> deletedSegment;
      public final NamedMetric<DeltaGauge> lowCdcRawSpace;
      public final NamedMetric<DeltaGauge> criticalCdcRawSpace;
  
      public CdcMetrics(MetricRegistry metricRegistry)
      {
          this.metricRegistry = Objects.requireNonNull(metricRegistry, "Metric registry can not be null");
          this.cdcRawCleanerFailed = createMetric("CleanerFailed", name -> metricRegistry.gauge(name, DeltaGauge::new));
          this.totalConsumedCdcBytes = createMetric("TotalConsumedBytes", name -> metricRegistry.gauge(name, DeltaGauge::new));
          this.totalCdcSpaceUsed = createMetric("TotalSpaceUsed", name -> metricRegistry.gauge(name, () -> new DefaultSettableGauge<>(0L)));
          this.orphanedIdx = createMetric("OrphanedIdxFile", name -> metricRegistry.gauge(name, DeltaGauge::new));
          this.deletedSegment = createMetric("DeletedSegment", name -> metricRegistry.gauge(name, DeltaGauge::new));
          this.oldestSegmentAge = createMetric("OldestSegmentAgeSeconds", name -> metricRegistry.gauge(name, () -> new DefaultSettableGauge<>(0)));
          this.lowCdcRawSpace = createMetric("LowSpace", name -> metricRegistry.gauge(name, DeltaGauge::new));
          this.criticalCdcRawSpace = createMetric("CriticalSpace", name -> metricRegistry.gauge(name, DeltaGauge::new));
      }
  
      private <T extends Metric> NamedMetric<T> createMetric(String simpleName, Function<String, T> metricCreator)
      {
          return NamedMetric.builder(metricCreator)
                            .withDomain(DOMAIN)
                            .withName(simpleName)
                            .build();
      }
  }
  