greenplumn CParseHandlerCostModel 源码
greenplumn CParseHandlerCostModel 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerCostModel.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CParseHandlerCostModel.h
//
// @doc:
// SAX parse handler class for parsing cost model config
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerCostModel_H
#define GPDXL_CParseHandlerCostModel_H
#include "gpos/base.h"
#include "gpopt/cost/ICostModel.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
class CParseHandlerCostParams;
//---------------------------------------------------------------------------
// @class:
// CParseHandlerCostModel
//
// @doc:
// SAX parse handler class for parsing cost model config options
//
//---------------------------------------------------------------------------
class CParseHandlerCostModel : public CParseHandlerBase
{
private:
ICostModel::ECostModelType m_cost_model_type;
ULONG m_num_of_segments;
// cost model
ICostModel *m_cost_model;
CParseHandlerCostParams *m_parse_handler_cost_params;
// process the start of an element
void StartElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname, // element's qname
const Attributes &attr // element's attributes
) override;
// process the end of an element
void EndElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname // element's qname
) override;
public:
CParseHandlerCostModel(const CParseHandlerCostModel &) = delete;
// ctor/dtor
CParseHandlerCostModel(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
~CParseHandlerCostModel() override;
// cost model
ICostModel *GetCostModel() const;
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerCostModel_H
// EOF
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