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.instance;
  
  import java.util.Objects;
  
  import com.codahale.metrics.DefaultSettableGauge;
  import com.codahale.metrics.MetricRegistry;
  import org.apache.cassandra.sidecar.metrics.NamedMetric;
  
  import static org.apache.cassandra.sidecar.metrics.instance.InstanceMetrics.INSTANCE_PREFIX;
  
  /**
   * Tracks health related metrics of a Cassandra instance maintained by Sidecar.
   */
  public class InstanceHealthMetrics
  {
      public static final String DOMAIN = INSTANCE_PREFIX + ".Health";
      protected final MetricRegistry metricRegistry;
      public final NamedMetric<DefaultSettableGauge<Integer>> jmxDown;
      public final NamedMetric<DefaultSettableGauge<Integer>> nativeDown;
  
      public InstanceHealthMetrics(MetricRegistry registry)
      {
          this.metricRegistry = Objects.requireNonNull(registry, "Metric registry can not be null");
  
          jmxDown
          = NamedMetric.builder(name -> registry.gauge(name, () -> new DefaultSettableGauge<>(0)))
                       .withDomain(DOMAIN)
                       .withName("JmxDown")
                       .build();
          nativeDown
          = NamedMetric.builder(name -> registry.gauge(name, () -> new DefaultSettableGauge<>(0)))
                       .withDomain(DOMAIN)
                       .withName("NativeDown")
                       .build();
      }
  }
  