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.fuseki;
  
  import org.apache.jena.sys.JenaSubsystemLifecycle;
  import org.apache.jena.sys.JenaSystem;
  
  public class InitDeltaFuseki implements JenaSubsystemLifecycle {
  
      private static volatile boolean initialized = false ;
      private static Object           initLock    = new Object() ;
  
      @Override
      public void start() {
          init() ;
      }
  
      @Override
      public void stop() {}
  
      @Override
      public int level() { return 1000; }
  
      public static void init() {
          if ( initialized )
              return ;
          synchronized (initLock) {
              if ( initialized ) {
                  JenaSystem.logLifecycle("InitDeltaFuseki.init - skip") ;
                  return ;
              }
              initialized = true ;
              JenaSystem.logLifecycle("InitDeltaFuseki.init - start") ;
  
              JenaSystem.logLifecycle("InitDeltaFuseki.init - finish") ;
  
          }
      }
  }
  