greenplumn IMDCacheObject 源码
greenplumn IMDCacheObject 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/IMDCacheObject.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// IMDCacheObject.h
//
// @doc:
// Base interface for metadata cache objects
//---------------------------------------------------------------------------
#ifndef GPMD_IMDCacheObject_H
#define GPMD_IMDCacheObject_H
#include "gpos/base.h"
#include "naucrates/md/CMDName.h"
#include "naucrates/md/IMDId.h"
#include "naucrates/md/IMDInterface.h"
// fwd decl
namespace gpos
{
class CWStringDynamic;
}
namespace gpdxl
{
class CXMLSerializer;
}
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// IMDCacheObject
//
// @doc:
// Base interface for metadata cache objects
//
//---------------------------------------------------------------------------
class IMDCacheObject : public IMDInterface
{
public:
// Serialize a list of metadata id elements using pstrTokenList
// as the root XML element for the list, and each metadata id is
// serialized in the form of a pstrTokenListItem element.
// The serialized information looks like this:
// <strTokenList>
// <strTokenListItem .../>...
// </strTokenList>
static void SerializeMDIdList(CXMLSerializer *xml_serializer,
const IMdIdArray *mdid_array,
const CWStringConst *strTokenList,
const CWStringConst *strTokenListItem);
// type of md object
enum Emdtype
{
EmdtRel,
EmdtInd,
EmdtFunc,
EmdtAgg,
EmdtOp,
EmdtType,
EmdtTrigger,
EmdtCheckConstraint,
EmdtRelStats,
EmdtColStats,
EmdtCastFunc,
EmdtScCmp
};
// md id of cache object
virtual IMDId *MDId() const = 0;
// cache object name
virtual CMDName Mdname() const = 0;
// object type
virtual Emdtype MDType() const = 0;
// serialize object in DXL format
virtual void Serialize(gpdxl::CXMLSerializer *) const = 0;
// DXL string representation of cache object
virtual const CWStringDynamic *GetStrRepr() const = 0;
// serialize the metadata id information as the attributes of an
// element with the given name
virtual void SerializeMDIdAsElem(gpdxl::CXMLSerializer *xml_serializer,
const CWStringConst *element_name,
const IMDId *mdid) const;
#ifdef GPOS_DEBUG
virtual void DebugPrint(IOstream &os) const = 0;
#endif
};
using IMDCacheObjectArray = CDynamicPtrArray<IMDCacheObject, CleanupRelease>;
} // namespace gpmd
#endif // !GPMD_IMDCacheObject_H
// EOF
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