FwdLauncher.java

/*
** Module   : FwdLauncher.java
** Abstract : entry point when using appcds
**
** Copyright (c) 2024, Golden Code Development Corporation.
**
** -#- -I- --Date-- ----------------------------------Description-----------------------------------
** 001 AD  20240227 Created new app entry point when using AppCDS to
*                   properly load ServerDriver with MultiClassLoader.
** 002 ICP 20240702 Updated the main method to set the CentralLogger
*                   mode to ensure proper log handling.
*/

/*
** 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 may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
** 
** Additional terms under GNU Affero GPL version 3 section 7:
** 
**   Under Section 7 of the GNU Affero GPL version 3, the following additional
**   terms apply to the works covered under the License.  These additional terms
**   are non-permissive additional terms allowed under Section 7 of the GNU
**   Affero GPL version 3 and may not be removed by you.
** 
**   0. Attribution Requirement.
** 
**     You must preserve all legal notices or author attributions in the covered
**     work or Appropriate Legal Notices displayed by works containing the covered
**     work.  You may not remove from the covered work any author or developer
**     credit already included within the covered work.
** 
**   1. No License To Use Trademarks.
** 
**     This license does not grant any license or rights to use the trademarks
**     Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
**     of Golden Code Development Corporation. You are not authorized to use the
**     name Golden Code, FWD, or the names of any author or contributor, for
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**     You may not represent yourself as Golden Code Development Corporation or FWD.
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**     the covered work, without written authorization.
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**     versions of the covered work must be marked in a reasonable way to make it
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*/

package com.goldencode.p2j.main;

import java.lang.reflect.*;

import com.goldencode.p2j.classloader.MultiClassLoader;
import com.goldencode.p2j.util.logging.CentralLogger;

/**
 * Entry point used when starting the server with AppCDS. 
 * Since AppCDS does not allow setting the class loader as a command line argument, 
 * to load the classic entry point of the server, {@link ServerDriver}, 
 * the {@link MultiClassLoader} class loader is set as context class loader
 * and used to load the original entry point. This way we ensure the original entry point and all
 * classes loaded because of it are also loaded using the {@link MultiClassLoader}.
 */
public class FwdLauncher
{
   private static CentralLogger LOG;
   
   /**
    * The command line entry point.
    * 
    * @param  args
    *         The array of command-line parameters.
    */
   public static void main(String[] args) 
   {
      CentralLogger.setMode(CentralLogger.Mode.SERVER_BASE);
      ClassLoader systemClassLoader = FwdLauncher.class.getClassLoader();
      MultiClassLoader multiClassLoader = new MultiClassLoader(systemClassLoader);
      Thread.currentThread().setContextClassLoader(multiClassLoader);
      
      LOG = CentralLogger.get(FwdLauncher.class);
      
      try
      {
         Class<?> serverDriverClazz = multiClassLoader.loadClass("com.goldencode.p2j.main.ServerDriver");
         Method mainMethod = serverDriverClazz.getDeclaredMethod("main", String[].class);
         mainMethod.setAccessible(true);
         mainMethod.invoke(null, new Object[]{args});
      }
      catch (ClassNotFoundException e)
      {
         LOG.severe("Class {@link ServerDriver} can't be found.");
      }
      catch (NoSuchMethodException e)
      {
         LOG.severe("Method {@link ServerDriver.main()} can't be found.");
      }
      catch (InvocationTargetException e)
      {
         LOG.severe(e.getMessage());
      }
      catch (IllegalAccessException e) 
      {
         LOG.severe("Thrown when invoking ServerDriver::main() from FwdLauncher::main().\n"
                  + "Should not be thrown, as it is set accessible before invoking.");
      }
  }
}