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/* lobdata.h
*
* $Id$
*
* This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
* project.
*
* Copyright (C) 1998-2012 OpenLink Software
*
* This project is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; only version 2 of the License, dated June 1991.
*
* This program 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 along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*
*/
#ifndef LOBDATA_H
#define LOBDATA_H
#include "baseobj.h"
#include "data.h"
#include "error.h"
// This sync object is to be used for synchronization with SequentialStream object.
class LobStreamSyncObj : public SyncObj
{
public:
LobStreamSyncObj()
{
m_fIsRowsetAlive = false;
m_fIsStreamAlive = false;
}
bool
IsRowsetAlive()
{
return m_fIsRowsetAlive;
}
bool
IsStreamAlive()
{
return m_fIsStreamAlive;
}
void
SetRowsetStatus(bool fIsRowsetAlive)
{
m_fIsRowsetAlive = fIsRowsetAlive;
if (!m_fIsRowsetAlive && !m_fIsStreamAlive)
delete this;
}
void
SetStreamStatus(bool fIsStreamAlive)
{
m_fIsStreamAlive = fIsStreamAlive;
if (!m_fIsRowsetAlive && !m_fIsStreamAlive)
delete this;
}
private:
bool m_fIsRowsetAlive;
bool m_fIsStreamAlive;
};
struct CGetDataSequentialStreamInitializer
{
LobStreamSyncObj* pStreamSync;
GetDataHandler* pgd;
HROW iRecordID;
DBORDINAL iFieldOrdinal;
SQLSMALLINT wSqlCType;
};
class NOVTABLE CGetDataSequentialStream :
public ISequentialStream,
public ISupportErrorInfoImpl<CGetDataSequentialStream>,
public ComObjBase
{
public:
CGetDataSequentialStream();
~CGetDataSequentialStream();
HRESULT Initialize (CGetDataSequentialStreamInitializer* pInitializer);
void Delete();
virtual HRESULT GetInterface(REFIID riid, IUnknown** ppUnknown);
const IID** GetSupportErrorInfoIIDs();
HRESULT Init(LobStreamSyncObj* pStreramSync, GetDataHandler* pgd,
HROW iRecordID, DBORDINAL iFieldOrdinal, SQLSMALLINT wSqlCType);
void Kill();
// ISequentialStream members
STDMETHODIMP Read
(
void* pv,
ULONG cb,
ULONG* pcbRead
);
STDMETHODIMP Write
(
void const* pv,
ULONG cb,
ULONG* pcbWritten
);
private:
enum StreamStatus
{
STATUS_UNINITIALIZED,
STATUS_INITIALIZED,
STATUS_INPROGRESS,
STATUS_FINISHED,
STATUS_ZOMBIE
};
StreamStatus m_status;
LobStreamSyncObj* m_pStreamSync;
GetDataHandler* m_pgd;
HROW m_iRecordID;
DBORDINAL m_iFieldOrdinal;
SQLSMALLINT m_wSqlCType;
IUnknown* m_pUnkFTM;
};
#endif
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