/*MT*
    
    MediaTomb - http://www.mediatomb.cc/
    
    process_io_handler.h - this file is part of MediaTomb.
    
    Copyright (C) 2005 Gena Batyan <bgeradz@mediatomb.cc>,
                       Sergey 'Jin' Bostandzhyan <jin@mediatomb.cc>
    
    Copyright (C) 2006-2009 Gena Batyan <bgeradz@mediatomb.cc>,
                            Sergey 'Jin' Bostandzhyan <jin@mediatomb.cc>,
                            Leonhard Wimmer <leo@mediatomb.cc>
    
    MediaTomb is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2
    as published by the Free Software Foundation.
    
    MediaTomb 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
    version 2 along with MediaTomb; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
    
    $Id: process_io_handler.h 2010 2009-01-11 19:10:43Z lww $
*/

/// \file process_io_handler.h
/// \brief Definition of the ProcessIOHandler class.
#ifndef __PROCESS_IO_HANDLER_H__
#define __PROCESS_IO_HANDLER_H__

#include "common.h"
#include "io_handler.h"
#include "executor.h"

#define FIFO_READ_TIMEOUT 2
#define FIFO_WRITE_TIMEOUT 2

class ProcListItem : public zmm::Object
{
public:
    ProcListItem(zmm::Ref<Executor> exec, bool abortOnDeath = false);
    zmm::Ref<Executor> getExecutor();
    bool abortOnDeath();

protected:
    zmm::Ref<Executor> executor;
    bool abort;
};

/// \brief Allows the web server to read from a fifo.
class ProcessIOHandler : public IOHandler
{
public:
    /// \brief Sets the filename to work with.
    /// \param filename to read the data from
    /// \param proclist associated processes that will be terminated once
    /// they are no longer needed
    ProcessIOHandler(zmm::String filename, zmm::Ref<Executor> main_proc,
                     zmm::Ref<zmm::Array<ProcListItem> > proclist = nil, 
                     bool ignoreSeek = false);
    
    /// \brief Opens file for reading (writing is not supported)
    virtual void open(IN enum UpnpOpenFileMode mode);

    /// \brief Reads a previously opened file sequentially.
    /// \param buf Data from the file will be copied into this buffer.
    /// \param length Number of bytes to be copied into the buffer.
    virtual int read(OUT char *buf, IN size_t length);

    /// \brief Writes to a previously opened file.
    /// \param buf Data from the buffer will be written to the file.
    /// \param length Number of bytes to be written from the buffer.
    /// \return number of bytes written.
    virtual int write(OUT char *buf, IN size_t length);

    /// \brief Performs seek on an open file.
    /// \param offset Number of bytes to move in the file. For seeking forwards
    /// positive values are used, for seeking backwards - negative. Offset must
    /// be positive if origin is set to SEEK_SET
    /// \param whence The position to move relative to. SEEK_CUR to move relative
    /// to current position, SEEK_END to move relative to the end of file,
    /// SEEK_SET to specify an absolute offset.
    virtual void seek(IN off_t offset, IN int whence);


    /// \brief Close a previously opened file and kills the kill_pid process
    virtual void close();

    ~ProcessIOHandler();

protected:
    /// \brief List of associated processes.
    zmm::Ref<zmm::Array<ProcListItem> > proclist;

    /// \brief Main process used for reading
    zmm::Ref<Executor> main_proc;

    /// \brief name of the file or fifo to read the data from
    zmm::String filename;

    /// \brief file descriptor
    int fd;

    /// \brief if this flag is set seek on a fifo will not return an error
    bool ignore_seek;


    bool abort();
    void killall();
    void registerAll();
    void unregisterAll();
};


#endif // __PROCESS_IO_HANDLER_H__
