content: /**
   * Licensed 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.aurora.scheduler.stats;
  
  import javax.inject.Inject;
  
  import com.google.common.base.Joiner;
  
  import org.apache.aurora.common.inject.TimedInterceptor.Timed;
  import org.apache.aurora.scheduler.base.Query;
  import org.apache.aurora.scheduler.resources.ResourceType;
  import org.apache.aurora.scheduler.stats.ResourceCounter.Metric;
  import org.apache.aurora.scheduler.storage.Storage.StorageException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Calculates and exports aggregate stats about resources consumed by active tasks.
   */
  class TaskStatCalculator implements Runnable {
    private static final Logger LOG = LoggerFactory.getLogger(TaskStatCalculator.class);
  
    private final CachedCounters counters;
    private final ResourceCounter resourceCounter;
  
    @Inject
    TaskStatCalculator(ResourceCounter resourceCounter, CachedCounters counters) {
      this.resourceCounter = requireNonNull(resourceCounter);
      this.counters = requireNonNull(counters);
    }
  
    private void update(String prefix, Metric metric) {
      metric.getBag().streamResourceVectors().forEach(r -> {
        ResourceType type = r.getKey();
        String metricName =
            Joiner.on("_").join(prefix, type.getAuroraName(), type.getAuroraStatUnit()).toLowerCase();
        counters.get(metricName).set((long) metric.getBag().valueOf(type));
      });
    }
  
    @Timed("task_stat_calculator_run")
    @Override
    public void run() {
      try {
        for (Metric metric : resourceCounter.computeConsumptionTotals()) {
          update("resources_" + metric.type.name(), metric);
        }
        // Export consumption per role
        for (ResourceCounter.MetricType type: ResourceCounter.MetricType.values()) {
          resourceCounter.computeAggregates(
              Query.unscoped().active(),
              type.filter,
              (taskConfig) -> type.name() + "_" + taskConfig.getJob().getRole())
              .forEach((name, metric) -> update("resources_per_role_" + name, metric));
        }
  
        update("resources_allocated_quota", resourceCounter.computeQuotaAllocationTotals());
        resourceCounter.computeQuotaAllocationByRole()
            .forEach((role, metric) -> update("quota_per_role_" + role, metric));
      } catch (StorageException e) {
        LOG.debug("Unable to fetch metrics, storage is likely not ready.");
      }
    }
  }
  