greenplumn CJobTransformation 源码
greenplumn CJobTransformation 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/search/CJobTransformation.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CJobTransformation.h
//
// @doc:
// Transform group expression job
//---------------------------------------------------------------------------
#ifndef GPOPT_CJobTransformation_H
#define GPOPT_CJobTransformation_H
#include "gpopt/search/CJob.h"
#include "gpopt/search/CJobStateMachine.h"
namespace gpopt
{
using namespace gpos;
// prototypes
class CGroup;
class CGroupExpression;
class CXform;
//---------------------------------------------------------------------------
// @class:
// CJobTransformation
//
// @doc:
// Runs the given transformation (XForm) rule.
//
//---------------------------------------------------------------------------
class CJobTransformation : public CJob
{
public:
// transition events of a transformation
enum EEvent
{
eevCompleted,
eevSentinel
};
// states of a transformation
enum EState
{
estInitialized = 0,
estCompleted,
estSentinel
};
private:
// shorthand for job state machine
using JSM = CJobStateMachine<EState, estSentinel, EEvent, eevSentinel>;
// target group expression
CGroupExpression *m_pgexpr;
// xform to apply to group expression
CXform *m_xform;
// job state machine
JSM m_jsm;
// apply transformation action
static EEvent EevtTransform(CSchedulerContext *psc, CJob *pj);
public:
CJobTransformation(const CJobTransformation &) = delete;
// ctor
CJobTransformation();
// dtor
~CJobTransformation() override;
// initialize job
void Init(CGroupExpression *pgexpr, CXform *pxform);
// schedule a new transformation job
static void ScheduleJob(CSchedulerContext *psc, CGroupExpression *pgexpr,
CXform *pxform, CJob *pjParent);
// job's main function
BOOL FExecute(CSchedulerContext *psc) override;
#ifdef GPOS_DEBUG
// print function
IOstream &OsPrint(IOstream &os) const override;
// dump state machine diagram in graphviz format
virtual IOstream &
OsDiagramToGraphviz(CMemoryPool *mp, IOstream &os,
const WCHAR *wszTitle) const
{
(void) m_jsm.OsDiagramToGraphviz(mp, os, wszTitle);
return os;
}
// compute unreachable states
void
Unreachable(CMemoryPool *mp, EState **ppestate, ULONG *pulSize) const
{
m_jsm.Unreachable(mp, ppestate, pulSize);
}
#endif // GPOS_DEBUG
// conversion function
static CJobTransformation *
PjConvert(CJob *pj)
{
GPOS_ASSERT(nullptr != pj);
GPOS_ASSERT(EjtTransformation == pj->Ejt());
return dynamic_cast<CJobTransformation *>(pj);
}
}; // class CJobTransformation
} // namespace gpopt
#endif // !GPOPT_CJobTransformation_H
// EOF
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