greenplumn CMDProviderRelcache 源码
greenplumn CMDProviderRelcache 代码
文件路径：/src/include/gpopt/relcache/CMDProviderRelcache.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CMDProviderRelcache.h
//
// @doc:
// Relcache-based provider of metadata objects.
//
// @test:
//
//
//---------------------------------------------------------------------------
#ifndef GPMD_CMDProviderRelcache_H
#define GPMD_CMDProviderRelcache_H
#include "gpos/base.h"
#include "gpos/string/CWStringBase.h"
#include "naucrates/md/CSystemId.h"
#include "naucrates/md/IMDId.h"
#include "naucrates/md/IMDProvider.h"
// fwd decl
namespace gpopt
{
class CMDAccessor;
}
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CMDProviderRelcache
//
// @doc:
// Relcache-based provider of metadata objects.
//
//---------------------------------------------------------------------------
class CMDProviderRelcache : public IMDProvider
{
private:
// memory pool
CMemoryPool *m_mp;
public:
CMDProviderRelcache(const CMDProviderRelcache &) = delete;
// ctor/dtor
explicit CMDProviderRelcache(CMemoryPool *mp);
~CMDProviderRelcache() override = default;
// returns the DXL string of the requested metadata object
CWStringBase *GetMDObjDXLStr(CMemoryPool *mp, CMDAccessor *md_accessor,
IMDId *md_id) const override;
// return the requested metadata object
IMDCacheObject *GetMDObj(CMemoryPool *mp, CMDAccessor *md_accessor,
IMDId *mdid) const override;
// return the mdid for the requested type
IMDId *
MDId(CMemoryPool *mp, CSystemId sysid,
IMDType::ETypeInfo type_info) const override
{
return GetGPDBTypeMdid(mp, sysid, type_info);
}
};
} // namespace gpmd
#endif // !GPMD_CMDProviderRelcache_H
// EOF
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