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.DeltaGauge;
  import org.apache.cassandra.sidecar.metrics.NamedMetric;
  
  import static org.apache.cassandra.sidecar.metrics.instance.InstanceMetrics.INSTANCE_PREFIX;
  
  /**
   * Tracks metrics during SSTable import operation done in Cassandra instance
   */
  public class SSTableImportMetrics
  {
      public static final String DOMAIN = INSTANCE_PREFIX + ".SSTableImport";
      protected final MetricRegistry metricRegistry;
      public final NamedMetric<DefaultSettableGauge<Integer>> pendingImports;
      public final NamedMetric<DeltaGauge> successfulImports;
      public final NamedMetric<DeltaGauge> failedImports;
  
      public SSTableImportMetrics(MetricRegistry metricRegistry)
      {
          this.metricRegistry = Objects.requireNonNull(metricRegistry, "Metric registry can not be null");
  
          pendingImports
          = NamedMetric.builder(name -> metricRegistry.gauge(name, () -> new DefaultSettableGauge<>(0)))
                       .withDomain(DOMAIN)
                       .withName("PendingImports")
                       .build();
          successfulImports
          = NamedMetric.builder(name -> metricRegistry.gauge(name, DeltaGauge::new))
                       .withDomain(DOMAIN)
                       .withName("SuccessfulImports")
                       .build();
          failedImports
          = NamedMetric.builder(name -> metricRegistry.gauge(name, DeltaGauge::new))
                       .withDomain(DOMAIN)
                       .withName("FailedImports")
                       .build();
      }
  }
  