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;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.ServiceLoader;
  
  /**
   * Utility methods for Alluxio services.
   */
  public final class ServiceUtils {
  
    /**
     * @return service loader for master factories
     */
    public static synchronized ServiceLoader<MasterFactory> getMasterServiceLoader() {
      return ServiceLoader.load(MasterFactory.class, MasterFactory.class.getClassLoader());
    }
  
    /**
     * @return the list of master service names
     */
    public static List<String> getMasterServiceNames() {
      List<String> masterServiceNames = new ArrayList<>();
      for (MasterFactory factory : getMasterServiceLoader()) {
        if (factory.isEnabled()) {
          masterServiceNames.add(factory.getName());
        }
      }
      return masterServiceNames;
    }
  
    private ServiceUtils() {} // prevent instantiation
  }
  