/*
 * Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source 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 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Nam Nguyen
 */

package com.caucho.quercus.lib;

import com.caucho.quercus.annotation.ResourceType;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.EnvCleanup;

import java.util.logging.Level;
import java.util.logging.Logger;

/*
 * Represents a resource opened by proc_open().
 */
@ResourceType("process")
public class ProcOpenResource
    implements EnvCleanup
{
  private static final Logger log
  = Logger.getLogger(ProcOpenResource.class.getName());

  private Env _env;

  private ProcOpenOutput _in;
  private ProcOpenInput _out;
  private ProcOpenInput _err;

  private Process _process;

  private String _command;
  private boolean _isRunning = true;
  private int _exitCode = -1;

  public ProcOpenResource(Env env,
                          Process process,
                          ProcOpenOutput in,
                          ProcOpenInput out,
                          ProcOpenInput err,
                          String command)
  {
    _env = env;
    _process = process;

    _in = in;
    _out = out;
    _err = err;
    _command = command;

    env.addCleanup(this);
  }

  public boolean isRunning()
  {
    if (! _isRunning)
      return false;

    try {
      _exitCode = _process.exitValue();
      _isRunning = false;

      return false;

    } catch (IllegalThreadStateException e) {
      return true;
    }
  }

  public int getExitCode()
  {
    if (! _isRunning)
      return _exitCode;

    try {
      _exitCode = _process.exitValue();
      _isRunning = false;

      return _exitCode;
    } catch (IllegalThreadStateException e) {
      return -1;
    }
  }

  public String getCommand()
  {
    return _command;
  }

  public int pclose()
  {
    try {
      if (_in != null)
        _in.close();

      _out.close();
      _err.close();

      return _process.waitFor();
    }
    catch (Exception e) {
      log.log(Level.FINE, e.getMessage());
      _env.warning(e);

      return -1;
    }
    finally {
      _env.removeCleanup(this);
    }
  }

  public boolean terminate()
  {
    if (_in != null)
      _in.close();

    _out.close();
    _err.close();

    _process.destroy();

    _env.removeCleanup(this);

    return true;
  }

  /**
   * Implements the EnvCleanup interface.
   */
  public void cleanup()
  {
    pclose();
  }

}
