113 lines
4.7 KiB
C++
113 lines
4.7 KiB
C++
/*=============================================================================
|
|
# Filename: ISNode.h
|
|
# Author: syzz
|
|
# Mail: 1181955272@qq.com
|
|
# Last Modified: 2015-04-26 16:38
|
|
# Description: basic Node class, father of ISIntlNode and ISLeafNode
|
|
=============================================================================*/
|
|
|
|
#ifndef _KVSTORE_ISTREE_NODE_ISNODE_H
|
|
#define _KVSTORE_ISTREE_NODE_ISNODE_H
|
|
|
|
#include "../../../Util/Util.h"
|
|
#include "../../../Util/Bstr.h"
|
|
|
|
class ISNode //abstract basic class
|
|
{
|
|
public:
|
|
static const unsigned DEGREE = 2 * 63; //the degree of B+ tree
|
|
static const unsigned MAX_CHILD_NUM = DEGREE;
|
|
static const unsigned MIN_CHILD_NUM = DEGREE >> 1;
|
|
static const unsigned MAX_KEY_NUM = MAX_CHILD_NUM - 1; //max key-num
|
|
static const unsigned MIN_KEY_NUM = MIN_CHILD_NUM - 1; //min key-num
|
|
/* diffrent flags for tree-nodes, 32-bit put rank in low-bits means no need to move*/
|
|
static const unsigned NF_IL = 0x80000000; //is leaf
|
|
static const unsigned NF_ID = 0x00080000; //is dirty, in rank-area
|
|
static const unsigned NF_IM = 0x20000000; //in memory, not virtual
|
|
//static const unsigned NF_IV = 0x10000000; //is virtual
|
|
static const unsigned NF_RK = 0x00ffffff; //select-rank, in Storage
|
|
static const unsigned NF_HT = 0xf00000; //height area in rank
|
|
static const unsigned NF_KN = 0x07f000; //NOTICE: decided by DEGREE
|
|
static const unsigned INTL_SIZE = sizeof(int) * MAX_KEY_NUM;
|
|
static const unsigned LEAF_SIZE = INTL_SIZE + sizeof(Bstr) * MAX_KEY_NUM;
|
|
protected:
|
|
unsigned store; //store address, the BLock index
|
|
unsigned flag; //NF_RK, NF_IL,NF_ID, NF_IV, propety
|
|
//int num; //totle keys num
|
|
//Node* father; //point to father-node, which must be IntlNode
|
|
int* keys;
|
|
void AllocKeys();
|
|
//void FreeKeys();
|
|
public:
|
|
ISNode();
|
|
ISNode(bool isVirtual);
|
|
bool isLeaf() const;
|
|
bool isDirty() const;
|
|
void setDirty();
|
|
void delDirty();
|
|
bool inMem() const;
|
|
void setMem();
|
|
void delMem();
|
|
//bool isVirtual() const;
|
|
//void setVirtual();
|
|
//void delVirtual();
|
|
unsigned getRank() const;
|
|
void setRank(unsigned _rank);
|
|
unsigned getHeight() const;
|
|
void setHeight(unsigned _h);
|
|
unsigned getNum() const;
|
|
bool setNum(int _num);
|
|
bool addNum();
|
|
bool subNum();
|
|
unsigned getStore() const;
|
|
void setStore(unsigned _store);
|
|
unsigned getFlag() const;
|
|
void setFlag(unsigned _flag);
|
|
int getKey(int _index) const; //need to check the index
|
|
bool setKey(int _key, int _index);
|
|
bool addKey(int _key, int _index);
|
|
bool subKey(int _index);
|
|
|
|
//several binary key search utilities
|
|
int searchKey_less(int _key) const;
|
|
int searchKey_equal(int _key) const;
|
|
int searchKey_lessEqual(int _key) const;
|
|
|
|
//virtual functions: polymorphic
|
|
virtual ISNode* getChild(int _index) const { return NULL; };
|
|
virtual bool setChild(ISNode* _child, int _index) { return true; };
|
|
virtual bool addChild(ISNode* _child, int _index) { return true; };
|
|
virtual bool subChild(int _index) { return true; };
|
|
virtual ISNode* getPrev() const { return NULL; };
|
|
virtual ISNode* getNext() const { return NULL; };
|
|
virtual const Bstr* getValue(int _index) const { return NULL; };
|
|
virtual bool setValue(const Bstr* _value, int _index, bool ifcopy = false) { return true; };
|
|
virtual bool addValue(const Bstr* _value, int _index, bool ifcopy = false) { return true; };
|
|
virtual bool subValue(int _index, bool ifdel = false) { return true; };
|
|
virtual void setPrev(ISNode* _prev) {};
|
|
virtual void setNext(ISNode* _next) {};
|
|
virtual void Virtual() = 0;
|
|
virtual void Normal() = 0;
|
|
virtual unsigned getSize() const = 0; //return all memory owned
|
|
virtual ISNode* split(ISNode* _father, int _index) = 0;
|
|
virtual ISNode* coalesce(ISNode* _father, int _index) = 0;
|
|
virtual void release() = 0; //release the node, only remain necessary information
|
|
virtual ~ISNode() {};
|
|
virtual void print(std::string s) = 0; //DEBUG(print the Node)
|
|
};
|
|
|
|
/*NOTICE(operations in release())
|
|
*To save memory, we can only remain store and flag(childs added for Leaf).
|
|
*However, in this way childs'pointers is ok to change, use Node** or Node*& is also nonsense
|
|
*because the pointer variable may die.
|
|
*Another way is only to release dynamic memory, and store thw whole, read the Bstr only to
|
|
*build. In this way nodes'pointer doesn't change, and operation is simplified, while memory
|
|
*is consumed a bit more. Because Bstrs consume the most memory, and memory-disk swapping is
|
|
*the most time-consuming thing, it seems to be a better way.
|
|
*WARN:when a node is in memory and not deleted, its basic content is always being! If nodes are
|
|
*really too many, this will cause disaster because we can't swap them out until tree is closed!
|
|
*To solve this problem, there should be two types of release-function: one to release Bstr, one
|
|
*to release the whole(pointer is invalid and rebuild problem)
|
|
*/
|
|
|
|
#endif |