Launcher.java :  » J2EE » panther » org » lateralnz » launchpad » Java Open Source

/* ====================================================================
 * The LateralNZ Software License, Version 1.0
 *
 * Copyright (c) 2003 LateralNZ.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by 
 *        LateralNZ (http://www.lateralnz.org/) and other third parties."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "LateralNZ" must not be used to endorse or promote 
 *    products derived from this software without prior written 
 *    permission. For written permission, please 
 *    contact oss@lateralnz.org.
 *
 * 5. Products derived from this software may not be called "Panther", 
 *    or "Lateral" or "LateralNZ", nor may "PANTHER" or "LATERAL" or 
 *    "LATERALNZ" appear in their name, without prior written 
 *    permission of LateralNZ.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of LateralNZ.  For more
 * information on Lateral, please see http://www.lateralnz.com/ or
 * http://www.lateralnz.org
 *
 */
package org.lateralnz.launchpad;

import java.io.IOException;
import java.util.Arrays;
import java.util.Properties;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.python.util.PythonInterpreter;

import org.lateralnz.common.util.ResourceUtils;
import org.lateralnz.common.util.ServletUtils;
import org.lateralnz.common.util.StringUtils;
import org.lateralnz.common.util.SystemUtils;

/**
 *
 *
 * @author J R Briggs
 */
public class Launcher extends HttpServlet {
  private static final Logger log = Logger.getLogger(Launcher.class.getName());
  
  private PythonInterpreter interp  = new PythonInterpreter();
  
  private Properties props;
  private String launchpadHome;
  private String initDir;
  
  public void init(ServletConfig config) throws ServletException {
    try {
      Properties props = ServletUtils.toProperties(config);

      launch(props);
    }
    catch (Exception e) {
      log.error(e);
      throw new ServletException(e);
    }
  }
    
  protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    throw new ServletException("not available");
  }
  
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    processRequest(request, response);
  }
  
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    processRequest(request, response);
  }
  
  public String getServletInfo() {
    return "Short description";
  }
  
  private void launch(Properties props) throws Exception {
    this.props = props;
    
    launchpadHome = System.getProperty("LAUNCHPAD_HOME");
    if (StringUtils.isEmpty(launchpadHome)) {
      launchpadHome = System.getProperty("launchpad_home"); 
    }
    
    if (StringUtils.isEmpty(launchpadHome)) {
      throw new Exception("property 'launchpad_home' is required");
    }
    launchpadHome = StringUtils.toDirectory(launchpadHome);    
    
    initDir = props.getProperty("conf_directory");
    if (!StringUtils.isEmpty(initDir)) {
      initDir = StringUtils.toDirectory(initDir); 
    }

    if (log.isInfoEnabled()) {
      log.info("Launchpad (" + launchpadHome + initDir + ")");
    }

    // startup scripts
    String[] filelist = SystemUtils.getFileList(launchpadHome + initDir, "^s.*\\.py$" );
    Arrays.sort(filelist);
    exec(filelist, true);
    
    Runtime.getRuntime().addShutdownHook(new ShutdownThread());
  }
  
  private final void exec(String[] files, boolean throwErrors) throws Exception {
    for (int i = 0; i < files.length; i++) {
      if (log.isInfoEnabled()) {
        log.info("executing : " + files[i]); 
      }
      
      String py = StringUtils.readFromFile(launchpadHome + initDir + files[i]);
      interp.set("sysprops", props);
      try {
        interp.exec(py);
      }
      catch (Exception e) {
        log.warn("unable to execute " + files[i]);
        if (throwErrors) {
          throw e;
        }
        else {
          e.printStackTrace();
        }
      }
    }
  }
  
  class ShutdownThread extends Thread {
    public void run() {
      try {
        //shutdown scripts
        String[] filelist = SystemUtils.getFileList(launchpadHome + initDir, "^k.*\\.py$" );
        Arrays.sort(filelist);
        exec(filelist, false);
      }
      catch (Exception e) {
        log.error(e);
      }
    }
  }
  
 /**
  * for running a standalone server
  */
  public static final void main(String[] args) {
    try {
      Properties props = System.getProperties();

      Launcher launcher = new Launcher();
      launcher.launch(props);

      while (true) {
        try { Thread.currentThread().sleep(9999999999999L); } catch (Exception e) { }
      } 

    }
    catch (Exception e) {
      e.printStackTrace(); 
    }
  }
}