/**
      This file is part of GoldenGate Project (named also GoldenGate or GG).
   
      Copyright 2009, Frederic Bregier, and individual contributors by the @author
      tags. See the COPYRIGHT.txt in the distribution for a full listing of
      individual contributors.
   
      All GoldenGate Project is free software: you can redistribute it and/or 
      modify it under the terms of the GNU General Public License as published 
     by the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     GoldenGate 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with GoldenGate .  If not, see <http://www.gnu.org/licenses/>.
   */
  package openr66.context.task;
  
  import goldengate.common.logging.GgInternalLogger;
  import goldengate.common.logging.GgInternalLoggerFactory;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  
  import openr66.context.ErrorCode;
  import openr66.context.R66Result;
  import openr66.context.R66Session;
  
  
  /**
   * Execute a Java command through Class.forName call
   *
   *
   * @author Frederic Bregier
   *
   */
  public class ExecJavaTask extends AbstractTask {
  
      /**
       * Internal Logger
       */
      private static final GgInternalLogger logger = GgInternalLoggerFactory
              .getLogger(ExecJavaTask.class);
  
      /**
       * @param argRule
       * @param delay
       * @param argTransfer
       * @param session
       */
      public ExecJavaTask(String argRule, int delay, String argTransfer,
              R66Session session) {
          super(TaskType.EXECJAVA, delay, argRule, argTransfer, session);
      }
  
      /*
       * (non-Javadoc)
       *
       * @see openr66.context.task.AbstractTask#run()
       */
      @Override
      public void run() {
          /*
           * First apply all replacements and format to argRule from context and
           * argTransfer. Will call exec (from first element of resulting string)
           * with arguments as the following value from the replacements. Return 0
           * if OK, else 1 for a warning else as an error. No change should be done
           * in the FILENAME
           */
          logger.debug("Exec with " + argRule + ":" + argTransfer + " and {}",
                  session);
          String finalname = argRule;
          if (argTransfer != null) {
              finalname = getReplacedValue(finalname, argTransfer.split(" "));
          }
          // First get the Class Name
          String[] args = finalname.split(" ");
          String className = args[0];
          R66Runnable runnable = null;
          try {
              runnable = (R66Runnable) Class.forName(className).newInstance();
          } catch (Exception e) {
              logger.error("ExecJava command is not available: " + className, e);
              R66Result result = new R66Result(session, false,
                      ErrorCode.CommandNotFound, session.getRunner());
              futureCompletion.setResult(result);
              futureCompletion.cancel();
              return;
          }
          runnable.setArgs(this.session, this.waitForValidation, this.useLocalExec, 
                  this.delay, args);
          logger.debug(className+" "+runnable.getClass().getName());
          if (! waitForValidation) {
              // Do not wait for validation
             futureCompletion.setSuccess();
             logger.info("Exec will start but no WAIT with {}", runnable);
         }
         int status = -1;
         if (waitForValidation && delay <= 0) {
             runnable.run();
             status = runnable.getFinalStatus();
         } else {
             ExecutorService executorService = Executors.newFixedThreadPool(1);
             executorService.execute(runnable);
             try {
                 Thread.yield();
                 executorService.shutdown();
                 if (waitForValidation) {
                     if (delay > 0) {
                         if (! executorService.awaitTermination(delay, TimeUnit.MILLISECONDS)) {
                             executorService.shutdownNow();
                             logger.error("Exec is in Time Out");
                             status = -1;
                         } else {
                             status = runnable.getFinalStatus();
                         }
                     } else {
                         while (!executorService.awaitTermination(30, TimeUnit.SECONDS)) ;
                         status = runnable.getFinalStatus();
                     }
                 } else {
                     while (!executorService.awaitTermination(30, TimeUnit.SECONDS)) ;
                     status = runnable.getFinalStatus();
                 }
             } catch (InterruptedException e) {
                 logger.error("Status: " + e.getMessage() + "\n\t Exec in error with " +
                         runnable);
                 if (waitForValidation) {
                     futureCompletion.cancel();
                 }
                 return;
             }
         }
         if (status == 0) {
             if (waitForValidation) {
                 futureCompletion.setSuccess();
             }
             logger.info("Exec OK with {}", runnable);
         } else if (status == 1) {
             logger.warn("Exec in warning with " + runnable);
             if (waitForValidation) {
                 futureCompletion.setSuccess();
             }
         } else {
             logger.error("Status: " + status + " Exec in error with " +
                     runnable);
             if (waitForValidation) {
                 futureCompletion.cancel();
             }
         }
     }
 
 }