cel_storagecache.h

//----------------------------------------------------------------------------
//
// cel_storagecache.h - Storage Cache implementation
//
// (C) 2003-2006 Celartem Technology Inc. All rights reserved.
//
//----------------------------------------------------------------------------
#ifndef _cel_storagecache_h_
#define _cel_storagecache_h_

#include "cel_storage.h"

namespace Celartem
{
    //------------------------------------------------------------------------
    template<typename T> struct Range
    {
        T offset; 
        T length; 
        
        Range(const T& _offset = 0, const T& _length = 0)
            : offset(_offset), length(_length)
        {
        }
        
        T end() const {return offset + length;}

        bool contains(const Range<T>& r) const
        {
            if(r.offset < offset || r.end() > end())
                return false;
            return true;
        }

        bool contains(uint64_t inPos, size_t inSize) const
        {
            if(inPos < offset || inPos + inSize > end())
                return false;
            return true;
        }

        bool contains(uint64_t inPos) const
        {
            if(inPos < offset || inPos >= end())
                return false;
            return true;
        }
        
        void merge(const Range& inRange)
        {
            length = inRange.end() - offset;
        }
    };
    
    //------------------------------------------------------------------------
    typedef Range<uint64_t> StorageRange;

    //------------------------------------------------------------------------
    class StorageLoader : public Referable
    {
    public:
        virtual StorageRange load(
            Storage* inStorage,
            uint64_t inPos,
            size_t inSize) = 0;
        
        virtual uint64_t getSize() const = 0;
        
        virtual String getStorageId() const = 0;

        virtual Time getLastUpdateTime() const = 0;

        virtual AutoPtr<StorageLoader> duplicate() const = 0;
        
        virtual void setBufferingSize(size_t inSize = 1024) = 0;
        
        virtual void setCallback(
            DuplicateStreamCallback inCallback,
            void* inContext) = 0;
    };
    
    //------------------------------------------------------------------------
    class AdvCachedStorage : public Storage
    {
    public:
        static AutoPtr<AdvCachedStorage> create(StorageLoader* inLoader);
    
        virtual void setBufferingSize(size_t inSize = 1024) = 0;
        
        virtual void setCallback(
            DuplicateStreamCallback inCallback,
            void* inContext) = 0;
    };
}

#endif // _cel_storagecache_h_

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This document is automatically generated using doxygen 1.5.4 at Fri Jun 27 18:21:55 2008.