package emissary.spi;
   
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import java.util.ServiceLoader;
   
   /**
    * Load SPI implementations to support initialization of the Emissary server.
   * 
   * <pre>
   * - Loading is delegated to the {@link java.util.ServiceLoader}.
   * - Configured via src/main/resources/META-INF/services/emissary.spi.InitializationProvider
   * </pre>
   */
  public class SPILoader {
  
      private static final Logger logger = LoggerFactory.getLogger(SPILoader.class);
  
      public static void load() {
          ServiceLoader<InitializationProvider> loader = ServiceLoader.load(InitializationProvider.class);
  
          loader.forEach(provider -> {
              provider.initialize();
              logger.info("Initialized {}", provider.getClass().getName());
          });
      }
  
      public static void unload() {
          ServiceLoader<InitializationProvider> loader = ServiceLoader.load(InitializationProvider.class);
          loader.forEach(InitializationProvider::shutdown);
      }
  
  
      private SPILoader() {}
  }