fileperblock_file.h

/***************************************************************************
 *  include/stxxl/bits/io/fileperblock_file.h
 *
 *  Part of the STXXL. See http://stxxl.sourceforge.net
 *
 *  Copyright (C) 2008, 2009 Johannes Singler <[email protected]>
 *
 *  Distributed under the Boost Software License, Version 1.0.
 *  (See accompanying file LICENSE_1_0.txt or copy at
 *  http://www.boost.org/LICENSE_1_0.txt)
 **************************************************************************/

#ifndef STXXL_FILEPERBLOCK_FILE_HEADER
#define STXXL_FILEPERBLOCK_FILE_HEADER

#include <string>
#include <stxxl/bits/io/disk_queued_file.h>


__STXXL_BEGIN_NAMESPACE


template <class base_file_type>
class fileperblock_file : public disk_queued_file
{
private:
    std::string filename_prefix;
    int mode;
    unsigned_type current_size;
    bool lock_file_created;
    base_file_type lock_file;

protected:
    std::string filename_for_block(unsigned_type offset);

public:
    fileperblock_file(
        const std::string & filename_prefix,
        int mode,
        int queue_id = DEFAULT_QUEUE,
        int allocator_id = NO_ALLOCATOR);

    virtual ~fileperblock_file();

    virtual void serve(const request * req) throw (io_error);

    virtual void set_size(offset_type new_size) { current_size = new_size; }

    virtual offset_type size() { return current_size; }

    virtual void lock();

    virtual void discard(offset_type offset, offset_type length);

    virtual void export_files(offset_type offset, offset_type length, std::string filename);

    const char * io_type() const;
};


__STXXL_END_NAMESPACE

#endif // !STXXL_FILEPERBLOCK_FILE_HEADER