Initializers.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2020 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.action;
 
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.turro.annotation.ElephantInitializer;
import org.turro.elephant.context.IConstructor;
import org.turro.reflection.Instances;
 
public class Initializers {
 
  public static boolean initialized = false;
  private static final Lock lock = new ReentrantLock();
  
  public static void initialize(IConstructor constructor) {
    if(!initialized) {
      lock.lock();
      try {
        if(!initialized) {
          initialized = true;
          Instances.cached().byAnnotation(ElephantInitializer.class, IElephantInitializer.class)
                  .forEach((initializer) -> {
                    initializer.initialize(constructor);
                  });
        }
      } finally {
        lock.unlock();
      }
    }
  }
 
  private Initializers() {
  }  
  
}