/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: XAsyncOutputMonitor.idl,v $
 *
 *  $Revision: 1.3 $
 *
 *  last change: $Author: rt $ $Date: 2005/09/09 15:30:00 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

#ifndef __com_sun_star_io_XAsyncOutputMonitor_idl__
#define __com_sun_star_io_XAsyncOutputMonitor_idl__

#ifndef __com_sun_star_io_IOException_idl__
#include "com/sun/star/io/IOException.idl"
#endif
#ifndef __com_sun_star_uno_XInterface_idl__
#include "com/sun/star/uno/XInterface.idl"
#endif

module com { module sun { module star { module io {

/**
   An optional companion interface to
   <type scope="com::sun::star::io">XOutputStream</type> that supports scenarios
   where <member scope="com::sun::star::io">XOutputStream::writeBytes</member>
   operates asynchronously and does not necessarily report any errors.

   <p>A typical scenario where this interface is useful is when an
   <type scope="com::sun::star::io">XOutputStream</type> is used to write to a
   file via NFS.  Normally, any calls to
   <member scope="com::sun::star::io">XOutputStream::writeBytes</member> will
   execute asynchronously then, in that any potential errors might only be
   reported by later calls to
   <member scope="com::sun::star::io">XOutputStream::writeBytes</member> or
   <member scope="com::sun::star::io">XOutputStream::closeOutput</member>.  If
   such an output stream shall not be closed immediately after one or more calls
   to <member scope="com::sun::star::io">XOutputStream::writeBytes</member>, but
   the client wants to know as soon as possible whether writing was successful,
   then <member
   scope="com::sun::star::io">XAsyncOutputMonitor::waitForCompletion</member>
   should be called after the series of calls to
   <member scope="com::sun::star::io">XOutputStream::writeBytes</member>.</p>

   @since OOo2.0.0
*/
interface XAsyncOutputMonitor {
    /**
       waits for the completion of any previous calls to
       <member scope="com::sun::star::io">XOutputStream::writeBytes</member>,
       and reports potentially pending errors.

       <p>Calling this method is potentially expensive (even if the associated
       <type scope="com::sun::star::io">XOutputStream</type> represents a local
       file not accessed via NFS, for example).  This method has a similar
       description to
       <member scope="com::sun::star::io">XOutputStream::flush</member>.
       However, where the semantics of <code>flush</code> are rather vague,
       <code>waitForCompletion</code> has very specific semantics&mdash;it just
       blocks long enough so that any errors encountered during previous calls
       to <member scope="com::sun::star::io">XOutputStream::writeBytes</member>
       can reliably be reported.  It specificially does not guarantee that any
       data have savely been stored on a stable physical medium, like a hard
       disk (and it is completely unspecified whether <code>flush</code> should
       give this guarantee).</p>

       @throws com::sun::star::io::IOException
       if any previous call to <member
       scope="com::sun::star::io">XOutputStream::writeBytes</member> encountered
       such an error, but has not yet reported it (in cases where
       <code>writeBytes</code> operates asynchronously).
    */
    void waitForCompletion() raises (IOException);
};

}; }; }; };

#endif
