greenplumn CXformFactory 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformFactory.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CXformFactory.h
/
/ @doc:
/ Management of global xform set
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformFactory_H
#define GPOPT_CXformFactory_H
#include "gpos/base.h"
#include "gpopt/xforms/CXform.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformFactory
/
/ @doc:
/ Factory class to manage xforms
/
/---------------------------------------------------------------------------
class CXformFactory
{
private:
/ definition of hash map to maintain mappings
using XformNameToXformMap =
CHashMap<CHAR, CXform, gpos::HashValue<CHAR>, CXform::FEqualIds,
CleanupDeleteArray<CHAR>, CleanupNULL<CXform>>;
/ memory pool
CMemoryPool *m_mp;
/ range of all xforms
CXform *m_rgpxf[CXform::ExfSentinel];
/ name -> xform map
XformNameToXformMap *m_phmszxform;
/ bitset of exploration xforms
CXformSet *m_pxfsExploration;
/ bitset of implementation xforms
CXformSet *m_pxfsImplementation;
/ ensure that xforms are inserted in order
ULONG m_lastAddedOrSkippedXformId;
/ global instance
static CXformFactory *m_pxff;
/ private ctor
explicit CXformFactory(CMemoryPool *mp);
/ actual adding of xform
void Add(CXform *pxform);
/ skip unused xforms that have been removed, preserving
/ xform ids of the remaining ones
void
SkipUnused(ULONG numXformsToSkip)
{
m_lastAddedOrSkippedXformId += numXformsToSkip;
}
public:
CXformFactory(const CXformFactory &) = delete;
/ dtor
~CXformFactory();
/ create all xforms
void Instantiate();
/ accessor by xform id
CXform *Pxf(CXform::EXformId exfid) const;
/ accessor by xform name
CXform *Pxf(const CHAR *szXformName) const;
/ accessor of exploration xforms
CXformSet *
PxfsExploration() const
{
return m_pxfsExploration;
}
/ accessor of implementation xforms
CXformSet *
PxfsImplementation() const
{
return m_pxfsImplementation;
}
/ is this xform id still used?
BOOL IsXformIdUsed(CXform::EXformId exfid);
/ global accessor
static CXformFactory *
Pxff()
{
return m_pxff;
}
/ initialize global factory instance
static GPOS_RESULT Init();
/ destroy global factory instance
static void Shutdown();
}; / class CXformFactory
} / namespace gpopt
#endif / !GPOPT_CXformFactory_H
/ EOF
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