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#ifndef NULLSOFT_BUFFERPOOLH
#define NULLSOFT_BUFFERPOOLH
#include <wmsdk.h>
#include "../nu/AutoLock.h"
#include <deque>
#include <iostream>
#include <cassert>
using namespace Nullsoft::Utility;
class Buffer;
class Pool
{
public:
virtual void ReturnBuffer(Buffer *buffer) = 0;
};
class Buffer : public INSSBuffer
{
public:
Buffer(size_t _size, Pool *_pool)
: size(_size),
length(0),
pool(_pool),
refCount(1)
{
buffer = new unsigned char[size];
}
~Buffer()
{
delete[] buffer;
}
ULONG STDMETHODCALLTYPE AddRef()
{
return ++refCount;
}
ULONG STDMETHODCALLTYPE Release()
{
assert(refCount > 0);
if (--refCount == 0)
{
length = 0;
pool->ReturnBuffer(this);
}
return refCount;
}
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void **ppvObject)
{
if (IID_INSSBuffer == iid)
{
*ppvObject = static_cast<INSSBuffer *>(this);
AddRef();
return S_OK;
}
else
{
*ppvObject = 0;
return E_NOINTERFACE;
}
}
HRESULT STDMETHODCALLTYPE GetBuffer(BYTE **ppdwBuffer)
{
*ppdwBuffer = (BYTE *)buffer;
return S_OK;
}
HRESULT STDMETHODCALLTYPE GetBufferAndLength(BYTE **ppdwBuffer, DWORD *pdwLength)
{
*ppdwBuffer = (BYTE *)buffer;
*pdwLength = length;
return S_OK;
}
HRESULT STDMETHODCALLTYPE GetLength(DWORD *pdwLength)
{
*pdwLength = length;
return S_OK;
}
HRESULT STDMETHODCALLTYPE GetMaxLength(DWORD *pdwLength)
{
*pdwLength = size;
return S_OK;
}
HRESULT STDMETHODCALLTYPE SetLength(DWORD dwLength)
{
length = dwLength;
return S_OK;
}
bool CanFit(size_t sizeCompare)
{
return (sizeCompare <= size);
}
size_t size, length;
Pool *pool;
int refCount;
unsigned char *buffer;
};
class BufferPool : public Pool
{
typedef std::deque<Buffer *> PoolList;
public:
long limit;
BufferPool() : allocSize(0),
poolSize(0),
limit(0)
{}
~BufferPool()
{
FreeBuffers();
}
void FreeBuffers()
{
AutoLock lock (bufferGuard);
while (!pool.empty())
{
Buffer *buff = pool.front();
delete buff;
pool.pop_front();
poolSize = 0;
}
}
void ReturnBuffer(Buffer *buffer)
{
AutoLock lock (bufferGuard);
pool.push_back(buffer);
}
Buffer *SearchForBuffer(size_t size)
{
PoolList::iterator itr;
AutoLock lock (bufferGuard);
for (itr = pool.begin();itr != pool.end();itr++)
{
if ((*itr)->CanFit(size))
{
Buffer *buff = *itr;
pool.erase(itr);
buff->AddRef();
return buff;
}
}
return 0;
}
void PreAllocate(size_t count)
{
if (!allocSize)
return ;
for (size_t i = 0;i != count;i++)
{
AutoLock lock (bufferGuard);
pool.push_back( new Buffer(allocSize , this));
}
}
INSSBuffer *GetBuffer(size_t size)
{
Buffer *buff = SearchForBuffer(size);
/*
while (!buff && poolSize>=limit && limit)
{
Sleep(1);
buff = SearchForBuffer(size);
}*/
if (!buff)
{
poolSize++;
std::cerr << "poolsize = " << poolSize << std::endl;
buff = new Buffer(allocSize ? allocSize : size, this);
}
return buff;
}
void test()
{
std::cerr << "pool.size() == " << pool.size();
std::cerr << " and poolsize == " << poolSize << std::endl;
}
void SetAllocSize(long size)
{
allocSize = size;
}
PoolList pool;
LockGuard bufferGuard;
size_t allocSize;
size_t poolSize;
};
#endif
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