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  }
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  }
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  /**periodically
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  /**periodically
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   * a) performs disk housekeeping
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   * a) performs disk housekeeping
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   * b) determines if a minimum threshold of disk space is available
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   * b) determines if a minimum threshold of disk space is available
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   * c) determines if a file can be touched
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   * changes the run level to CANNOT_CONTINUE if insufficient disk space
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   * changes the run level to CANNOT_CONTINUE if insufficient disk space
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   * otherwise changes the run level to ACTIVE and returns
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   * otherwise changes the run level to ACTIVE and returns
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   * implements the sequence diagram check environment
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   * implements the sequence diagram check environment
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   */
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   */
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  protected void checkEnvironment() throws Exception
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  protected void checkEnvironment() throws Exception
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      housekeep();
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      housekeep();
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      // attempt to exit
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      // attempt to exit
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      exit = true;
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      exit = true;
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      if ( !hasSufficientDiskSpace() )
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      if ( !hasSufficientDiskSpace() || !touch() )
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      {
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      {
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        mLogger.warn("checkEnvironment below disk free threshold");
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        mLogger.warn("checkEnvironment below disk free threshold or read only file system detected");
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        exit = false;
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        exit = false;
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        mRunLevel = RunLevel.CANNOT_CONTINUE;
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        mRunLevel = RunLevel.CANNOT_CONTINUE;
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        mLogger.warn("checkEnvironment changing run level to CANNOT_CONTINUE for rcon_id " + mRconId);
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        mLogger.warn("checkEnvironment changing run level to CANNOT_CONTINUE for rcon_id " + mRconId);
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        mRunLevel.persist(mReleaseManager, mRconId);
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        mRunLevel.persist(mReleaseManager, mRconId);
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        try
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        try
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      }
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      }
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    }
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    }
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    catch( SecurityException e )
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    catch( SecurityException e )
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    {
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    {
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      // this can be thrown by lastModified
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      // this can be thrown by lastModified
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       mLogger.warn("housekeep caught SecurityException");
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      mLogger.warn("housekeep caught SecurityException");
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    }
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    }
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  }
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  }
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  /**returns true if a file exists and can be deleted,
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   * created and exists in the file system
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   * this is to guard against read-only file systems
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   */
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  private boolean touch()
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  {
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    mLogger.debug("touch");
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    boolean retVal = true;
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    try
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    {
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      File touch = new File( String.valueOf( mRtagId ) + "touch" );
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      if ( touch.exists() )
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      {
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        // delete it
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        retVal = touch.delete();
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      }
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      if ( retVal )
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      {
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        // file does not exist
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        retVal = touch.createNewFile();
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      }
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    }
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    catch( SecurityException e )
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    {
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      // this can be thrown by exists, delete, createNewFile
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      retVal = false;
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      mLogger.warn("touch caught SecurityException");
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    }
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    catch( IOException e )
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    {
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      // this can be thrown by createNewFile
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      retVal = false;
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      mLogger.warn("touch caught IOException");
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    }
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    mLogger.info("touch returned " + retVal);
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    return retVal;
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  }
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  /**returns true if free disk space > 10G
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  /**returns true if free disk space > 10G
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   * this may become configurable if the need arises
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   * this may become configurable if the need arises
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   * refer to the sequence diagram check environment
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   * refer to the sequence diagram check environment
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   */
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   */
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  private boolean hasSufficientDiskSpace()
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  private boolean hasSufficientDiskSpace()