ThreadPoolFiles.hpp

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/*
    Copyright (c) 2009-2010 Christopher A. Taylor.  All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name of LibCat nor the names of its contributors may be used
      to endorse or promote products derived from this software without
      specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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*/

#ifndef CAT_THREAD_POOL_FILES_HPP
#define CAT_THREAD_POOL_FILES_HPP

#include <cat/threads/ThreadPool.hpp>
#include <cat/port/FastDelegate.h>

#if defined(CAT_OS_WINDOWS)
# include <cat/port/WindowsInclude.hpp>
#endif

namespace cat {


enum AsyncFileModes
{
    ASYNCFILE_READ = 1,
    ASYNCFILE_WRITE = 2,
    ASYNCFILE_RANDOM = 4
};

class AsyncFile : public ThreadRefObject
{
    HANDLE _file;

protected:
    char _file_path[MAX_PATH+1];

public:
    AsyncFile(int priorityLevel);
    virtual ~AsyncFile();

public:
    bool Valid();
    const char *GetFilePath();

public:
    /*
        In read mode, Open() will fail if the file does not exist.
        In write mode, Open() will create the file if it does not exist.
    */
    bool Open(const char *file_path, u32 async_file_modes);
    void Close();

    bool SetSize(u64 bytes);
    u64 GetSize();

    bool Read(AsyncBuffer *buffer, u64 offset, const AsyncCallback &callback);
    bool Write(AsyncBuffer *buffer, u64 offset, const AsyncCallback &callback = 0);
};


} // namespace cat

#endif // CAT_THREAD_POOL_FILES_HPP