core/sql/exp/ExpSeqGen.h

/**********************************************************************
// @@@ START COPYRIGHT @@@
//
// Licensed to the Apache Software Foundation (ASF) under one
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#ifndef EXP_SEQ_GEN_EXPR_H
#define EXP_SEQ_GEN_EXPR_H


/* -*-C++-*-
 *****************************************************************************
 *
 * File:         ExpSeqGen.h
 * Description:  
 *               
 *               
 * Created:      7/20/2014
 * Language:     C++
 *
 *
 *
 *
 *****************************************************************************
 */


#include "SequenceGeneratorAttributes.h"
#include "ComQueue.h"

  
class SeqGenEntry : public NABasicObject
{
 public:
  SeqGenEntry(Int64 sgUID, CollHeap * heap);

  short getNextSeqVal(SequenceGeneratorAttributes &sga, Int64 &seqVal);
  short getCurrSeqVal(SequenceGeneratorAttributes &sga, Int64 &seqVal);

  Int64 getSGObjectUID() { return sgUID_; }

 private:
  short fetchNewRange(SequenceGeneratorAttributes &inSGA);

  CollHeap * heap_;

  Int64 sgUID_;

  NABoolean fetchNewRange_;
  Int64 cachedStartValue_;
  Int64 cachedEndValue_;
  Int64 cachedCurrValue_;

  void * cliInterfaceArr_;
};

class SequenceValueGenerator : public NABasicObject
{
 public:
  SequenceValueGenerator(CollHeap * heap);
  SeqGenEntry * getEntry(SequenceGeneratorAttributes &sga);
  short getNextSeqVal(SequenceGeneratorAttributes &sga, Int64 &seqVal);
  short getCurrSeqVal(SequenceGeneratorAttributes &sga, Int64 &seqVal);

  HashQueue * sgQueue() { return sgQueue_;}
  CollHeap * getHeap() { return heap_; }

 private:
  CollHeap * heap_;

  HashQueue * sgQueue_;
};


#endif