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 com.datastax.oss.driver.internal.metrics.microprofile;
  
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
  import com.datastax.oss.driver.internal.core.metrics.AbstractMetricUpdater;
  import com.datastax.oss.driver.internal.core.metrics.MetricId;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.time.Duration;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  import java.util.concurrent.TimeUnit;
  import net.jcip.annotations.ThreadSafe;
  import org.eclipse.microprofile.metrics.Counter;
  import org.eclipse.microprofile.metrics.Gauge;
  import org.eclipse.microprofile.metrics.Histogram;
  import org.eclipse.microprofile.metrics.Metadata;
  import org.eclipse.microprofile.metrics.Meter;
  import org.eclipse.microprofile.metrics.Metric;
  import org.eclipse.microprofile.metrics.MetricID;
  import org.eclipse.microprofile.metrics.MetricRegistry;
  import org.eclipse.microprofile.metrics.MetricType;
  import org.eclipse.microprofile.metrics.Tag;
  import org.eclipse.microprofile.metrics.Timer;
  
  @ThreadSafe
  public abstract class MicroProfileMetricUpdater<MetricT> extends AbstractMetricUpdater<MetricT> {
  
    protected final MetricRegistry registry;
  
    protected final ConcurrentMap<MetricT, Metric> metrics = new ConcurrentHashMap<>();
  
    protected MicroProfileMetricUpdater(
        InternalDriverContext context, Set<MetricT> enabledMetrics, MetricRegistry registry) {
      super(context, enabledMetrics);
      this.registry = registry;
    }
  
    @Override
    public void incrementCounter(MetricT metric, @Nullable String profileName, long amount) {
      if (isEnabled(metric, profileName)) {
        getOrCreateCounterFor(metric).inc(amount);
      }
    }
  
    @Override
    public void updateHistogram(MetricT metric, @Nullable String profileName, long value) {
      if (isEnabled(metric, profileName)) {
        getOrCreateHistogramFor(metric).update(value);
      }
    }
  
    @Override
    public void markMeter(MetricT metric, @Nullable String profileName, long amount) {
      if (isEnabled(metric, profileName)) {
        getOrCreateMeterFor(metric).mark(amount);
      }
    }
  
    @Override
    public void updateTimer(
        MetricT metric, @Nullable String profileName, long duration, TimeUnit unit) {
      if (isEnabled(metric, profileName)) {
        getOrCreateTimerFor(metric).update(Duration.ofNanos(unit.toNanos(duration)));
      }
    }
  
    @Override
    public void clearMetrics() {
      for (MetricT metric : metrics.keySet()) {
        MetricId id = getMetricId(metric);
        Tag[] tags = MicroProfileTags.toMicroProfileTags(id.getTags());
        registry.remove(new MetricID(id.getName(), tags));
      }
      metrics.clear();
    }
  
    protected abstract MetricId getMetricId(MetricT metric);
  
    protected void initializeGauge(
        MetricT metric, DriverExecutionProfile profile, Gauge<Number> supplier) {
      if (isEnabled(metric, profile.getName())) {
        metrics.computeIfAbsent(
            metric,
            m -> {
              MetricId id = getMetricId(m);
              String name = id.getName();
              Tag[] tags = MicroProfileTags.toMicroProfileTags(id.getTags());
              Metadata metadata =
                  Metadata.builder().withName(name).withType(MetricType.GAUGE).build();
              return registry.register(metadata, supplier, tags);
            });
      }
    }
  
    protected void initializeCounter(MetricT metric, DriverExecutionProfile profile) {
      if (isEnabled(metric, profile.getName())) {
        getOrCreateCounterFor(metric);
      }
    }
  
    protected void initializeTimer(MetricT metric, DriverExecutionProfile profile) {
      if (isEnabled(metric, profile.getName())) {
        getOrCreateTimerFor(metric);
      }
    }
  
    protected Counter getOrCreateCounterFor(MetricT metric) {
      return (Counter)
          metrics.computeIfAbsent(
              metric,
              m -> {
                MetricId id = getMetricId(m);
                Tag[] tags = MicroProfileTags.toMicroProfileTags(id.getTags());
                return registry.counter(id.getName(), tags);
              });
    }
  
    protected Meter getOrCreateMeterFor(MetricT metric) {
      return (Meter)
          metrics.computeIfAbsent(
              metric,
              m -> {
                MetricId id = getMetricId(m);
                Tag[] tags = MicroProfileTags.toMicroProfileTags(id.getTags());
                return registry.meter(id.getName(), tags);
              });
    }
  
    protected Histogram getOrCreateHistogramFor(MetricT metric) {
      return (Histogram)
          metrics.computeIfAbsent(
              metric,
              m -> {
                MetricId id = getMetricId(m);
                Tag[] tags = MicroProfileTags.toMicroProfileTags(id.getTags());
                return registry.histogram(id.getName(), tags);
              });
    }
  
    protected Timer getOrCreateTimerFor(MetricT metric) {
      return (Timer)
          metrics.computeIfAbsent(
              metric,
              m -> {
                MetricId id = getMetricId(m);
                Tag[] tags = MicroProfileTags.toMicroProfileTags(id.getTags());
                return registry.timer(id.getName(), tags);
              });
    }
  }
  