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.
   *
   *  See the NOTICE file distributed with this work for additional
   *  information regarding copyright ownership.
   */
  
  package org.seaborne.delta.server.system;
  
  /** Lifecycle interface for subsystems. */ 
  public interface SubsystemLifecycle {
      
      /** start - a module should be ready to operate when this returns */  
      public void start() ;
      
      /** stop - a module should have preformed any shutdown operations by the time this returns */   
      public void stop() ;
      
      /** Provide a marker as to the level to order initialization, 10,20,30,... 
       * See {@link Initializer} for details.
       */
      default public int level() { return 9999 ; }
  }
  
  