content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.service.metrics;
  
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.master.service.SimpleService;
  import alluxio.metrics.MetricsSystem;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Simple service that manages the behavior of the metrics system.
   */
  public abstract class MetricsService implements SimpleService {
    protected static final Logger LOG = LoggerFactory.getLogger(MetricsService.class);
  
    protected void startMetricsSystem() {
      LOG.info("Start metric sinks.");
      MetricsSystem.startSinks(Configuration.getString(PropertyKey.METRICS_CONF_FILE));
    }
  
    protected void stopMetricsSystem() {
      LOG.info("Stop metric sinks.");
      MetricsSystem.stopSinks();
    }
  
    /**
     * Factory that provides a simple service that manages the behavior of the metrics system.
     */
    public static class Factory {
      /**
       * @return a simple service that manages the behavior of the metrics system
       */
      public static MetricsService create() {
        if (Configuration.getBoolean(PropertyKey.STANDBY_MASTER_METRICS_SINK_ENABLED)) {
          return new AlwaysOnMetricsService();
        }
        return new PrimaryOnlyMetricsService();
      }
    }
  }
  