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    * distributed with this work for additional information        *
    * regarding copyright ownership.  The ASF licenses this file   *
    * to you 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   *
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  package org.apache.james.postage;
  
  import org.apache.commons.configuration.ConfigurationException;
  import org.apache.commons.configuration.XMLConfiguration;
  import org.apache.james.postage.configuration.ConfigurationLoader;
  import org.apache.james.postage.configuration.PostageConfiguration;
  
  import java.util.Iterator;
  import java.util.Map;
  import java.util.ArrayList;
  import java.util.List;
  
  /***
   * bootstrapping the application
   */
  public class Main {
      private static PostageRunner m_currentPostageRunner = null;
  
      public static void main(String[] args) {
          if (args == null || args.length == 0) {
              System.out.println("Please provide the configuration file");
              return;
          }
  
          String filename = args[0];
  
          List scenariosToRun = new ArrayList();
          for (int i = 1; i < args.length; i++)
          {
              scenariosToRun.add(args[i]);
          }
  
          // load all scenarios from configuration file
          ConfigurationLoader configurationLoader = new ConfigurationLoader();
          Map configurations;
          try {
              // TODO allow different (non-xml) configs - as Common-Configuration supports it
              XMLConfiguration xmlConfiguration = new XMLConfiguration(filename);
              //xmlConfiguration.setThrowExceptionOnMissing(false);
              configurations = configurationLoader.create(xmlConfiguration);
          } catch (ConfigurationException e) {
              e.printStackTrace();
              return;
          }
  
          // register shutdown hook if this app is terminated from outside
          Runtime.getRuntime().addShutdownHook(new Thread(){public void run() {shutdown();}});
  
          // run all scenarios
          runScenarios(configurations, scenariosToRun);
      }
  
      private static void runScenarios(Map configurations, List scenariosToRun) {
          // run all scenarios which are requested to be run.
          int playedScenarioCounter = 0;
          Iterator iterator = configurations.keySet().iterator();
          while (iterator.hasNext()) {
              String id = (String)iterator.next();
              // if no scenario is given on the command line, all get executed
              // if one or more is given, all others are skipped
              if (!scenariosToRun.isEmpty() && !scenariosToRun.contains(id)) continue;
  
              playedScenarioCounter++;
              PostageConfiguration postageConfiguration = (PostageConfiguration) configurations.get(id);
              m_currentPostageRunner = new PostageRunner(postageConfiguration);
              m_currentPostageRunner.run(); // TODO maybe we want to run this Runnable in its own thread, but maybe not
          }
          m_currentPostageRunner = null;
          if (playedScenarioCounter == 0) {
              System.out.println("No scenario has been executed. ");
              System.out.println("Either those on the command line where not matching those in the file.");
              System.out.println("Or the configuration file is empty");
          }
      }
  
      private static void shutdown() {
          if (m_currentPostageRunner != null) m_currentPostageRunner.terminate();
      }
  
  }