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CWE-ou-minkata/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtSkipList.h

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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
/*****************************************************************************
*
* $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtSkipList.h
*
***/
#ifdef PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTSKIPLIST_H
#error "Header $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtSkipList.h included more than once"
#endif
#define PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTSKIPLIST_H
/*****************************************************************************
*
* Macros
*
***/
#define SKIPLIST(type, keyType, keyField, cmp) TSkipList< type, keyType, offsetof(type, keyField), cmp >
#define SKIPLIST_NUMERIC(type, keyType, keyField) SKIPLIST(type, keyType, keyField, TSkipListNumericCmp<keyType>)
#define SKIPLIST_STRING(type, keyType, keyField) SKIPLIST(type, keyType, keyField, TSkipListStringCmp<keyType>)
#define SKIPLIST_STRINGI(type, keyType, keyField) SKIPLIST(type, keyType, keyField, TSkipListStringCmpI<keyType>)
/*****************************************************************************
*
* Typedefs
*
***/
typedef void * SkipListTag;
/*****************************************************************************
*
* Comparers
*
***/
template<class K>
class TSkipListNumericCmp {
public:
static bool Eq (const K & a, const K & b) { return a == b; }
static bool Lt (const K & a, const K & b) { return a < b; }
};
template<class K>
class TSkipListStringCmp {
public:
static bool Eq (const K & a, const K & b) { return StrCmp(a, b, (unsigned)-1) == 0; }
static bool Lt (const K & a, const K & b) { return StrCmp(a, b, (unsigned)-1) < 0; }
};
template<class K>
class TSkipListStringCmpI {
public:
static bool Eq (const K & a, const K & b) { return StrCmpI(a, b, (unsigned)-1) == 0; }
static bool Lt (const K & a, const K & b) { return StrCmpI(a, b, (unsigned)-1) < 0; }
};
/*****************************************************************************
*
* TSkipList
*
***/
template<class T, class K, unsigned keyOffset, class Cmp>
class TSkipList {
private:
enum { kMaxLevels = 32 };
template<class T, class K>
struct TNode {
const K * key;
T * object;
unsigned level;
TNode<T, K> * prev;
TNode<T, K> * next[1]; // variable size array
};
typedef TNode<T,K> Node;
unsigned m_level;
Node * m_head;
Node * m_stop;
unsigned m_randomBits;
unsigned m_randomsLeft;
Node * AllocNode (unsigned levels);
void FreeNode (Node * node);
unsigned RandomLevel ();
public:
inline TSkipList ();
inline ~TSkipList ();
inline void Clear ();
inline void Delete (T * object);
inline T * Find (const K & key, SkipListTag * tag = nil) const;
inline T * FindNext (SkipListTag * tag) const;
inline T * Head (SkipListTag * tag) const;
inline T * Next (SkipListTag * tag) const;
inline T * Prev (SkipListTag * tag) const;
inline T * Tail (SkipListTag * tag) const;
inline void Link (T * object);
inline void Unlink (T * object);
inline void Unlink (SkipListTag * tag);
inline void UnlinkAll ();
#ifdef HS_DEBUGGING
inline void Print () const;
#endif
};
/*****************************************************************************
*
* TSkipList private member functions
*
***/
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
typename TSkipList<T,K,keyOffset,Cmp>::TNode<T,K> * TSkipList<T,K,keyOffset,Cmp>::AllocNode (unsigned level) {
unsigned size = offsetof(Node, next) + (level + 1) * sizeof(Node);
Node * node = (Node *)ALLOC(size);
node->level = level;
return node;
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
void TSkipList<T,K,keyOffset,Cmp>::FreeNode (TNode<T,K> * node) {
FREE(node);
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
unsigned TSkipList<T,K,keyOffset,Cmp>::RandomLevel () {
unsigned level = 0;
unsigned bits = 0;
while (!bits) {
bits = m_randomBits % 4;
if (!bits)
++level;
m_randomBits >>= 2;
m_randomsLeft -= 2;
if (!m_randomsLeft) {
m_randomBits = RandUnsigned();
m_randomsLeft = 30;
}
}
return level;
}
/*****************************************************************************
*
* TSkipList public member functions
*
***/
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
TSkipList<T,K,keyOffset,Cmp>::TSkipList () {
m_level = 0;
m_head = AllocNode(kMaxLevels);
m_stop = AllocNode(0);
m_randomBits = RandUnsigned();
m_randomsLeft = 30;
// Initialize header and stop skip node pointers
m_stop->prev = m_head;
m_stop->object = nil;
m_stop->next[0] = nil;
m_head->object = nil;
for (unsigned index = 0; index < kMaxLevels; ++index)
m_head->next[index] = m_stop;
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
TSkipList<T,K,keyOffset,Cmp>::~TSkipList () {
UnlinkAll();
ASSERT(m_stop->prev == m_head);
FreeNode(m_head);
FreeNode(m_stop);
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
void TSkipList<T,K,keyOffset,Cmp>::Clear () {
Node * ptr = m_head->next[0];
while (ptr != m_stop) {
Node * next = ptr->next[0];
DEL(ptr->object);
FreeNode(ptr);
ptr = next;
}
m_stop->prev = m_head;
for (unsigned index = 0; index < kMaxLevels; ++index)
m_head->next[index] = m_stop;
m_level = 0;
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
void TSkipList<T,K,keyOffset,Cmp>::Delete (T * object) {
Unlink(object);
DEL(object);
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
T * TSkipList<T,K,keyOffset,Cmp>::Find (const K & key, SkipListTag * tag) const {
Node * node = m_head;
m_stop->key = &key;
for (int level = (int)m_level; level >= 0; --level)
while (Cmp::Lt(*node->next[level]->key, key))
node = node->next[level];
node = node->next[0];
if (node != m_stop && Cmp::Eq(*node->key, *m_stop->key)) {
if (tag)
*tag = node;
return node->object;
}
else {
if (tag)
*tag = nil;
return nil;
}
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
T * TSkipList<T,K,keyOffset,Cmp>::FindNext (SkipListTag * tag) const {
Node * node = (Node *)*tag;
m_stop->key = node->key;
for (int level = (int)node->level; level >= 0; --level)
while (Cmp::Lt(*node->next[level]->key, *m_stop->key))
node = node->next[level];
node = node->next[0];
if (node != m_stop && Cmp::Eq(*node->key, *m_stop->key)) {
*tag = node;
return node->object;
}
else {
*tag = nil;
return nil;
}
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
T * TSkipList<T,K,keyOffset,Cmp>::Head (SkipListTag * tag) const {
ASSERT(tag);
Node * first = m_head->next[0];
if (first == m_stop) {
*tag = nil;
return nil;
}
*tag = first;
return first->object;
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
T * TSkipList<T,K,keyOffset,Cmp>::Next (SkipListTag * tag) const {
ASSERT(tag);
Node * node = (Node *)*tag;
ASSERT(node);
if (node->next[0] == m_stop) {
*tag = nil;
return nil;
}
*tag = node->next[0];
return node->next[0]->object;
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
T * TSkipList<T,K,keyOffset,Cmp>::Prev (SkipListTag * tag) const {
ASSERT(tag);
Node * node = (Node *)*tag;
ASSERT(node);
if (node->prev == m_head) {
*tag = nil;
return nil;
}
*tag = node->prev;
return node->prev->object;
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
T * TSkipList<T,K,keyOffset,Cmp>::Tail (SkipListTag * tag) const {
ASSERT(tag);
Node * last = m_stop->prev;
if (last == m_head) {
*tag = nil;
return nil;
}
*tag = last;
return last->object;
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
void TSkipList<T,K,keyOffset,Cmp>::Link (T * object) {
const K * key = (const K *)((const byte *)object + keyOffset);
// Find the node's insertion point
m_stop->key = key;
Node * update[kMaxLevels];
Node * node = m_head;
for (int level = (int)m_level; level >= 0; --level) {
while (Cmp::Lt(*node->next[level]->key, *key))
node = node->next[level];
update[level] = node;
}
node = node->next[0];
{
// Select a level for the skip node
unsigned newLevel = RandomLevel();
if (newLevel > m_level) {
if (m_level < kMaxLevels - 1) {
newLevel = ++m_level;
update[newLevel] = m_head;
}
else
newLevel = m_level;
}
// Create the node and insert it into the skip list
Node * node = AllocNode(newLevel);
node->key = key;
node->object = object;
for (unsigned level = newLevel; level >= 1; --level) {
node->next[level] = update[level]->next[level];
update[level]->next[level] = node;
}
node->prev = update[0];
node->next[0] = update[0]->next[0];
update[0]->next[0]->prev = node;
update[0]->next[0] = node;
}
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
void TSkipList<T,K,keyOffset,Cmp>::Unlink (T * object) {
const K * key = (const K *)((const byte *)object + keyOffset);
Node * node = m_head;
Node * update[kMaxLevels];
int level = m_level;
for (;;) {
// Find the node being unlinked
m_stop->key = key;
for (; level >= 0; --level) {
while (Cmp::Lt(*node->next[level]->key, *key))
node = node->next[level];
update[level] = node;
}
node = node->next[0];
// Node wasn't found so do nothing
if (*node->key != *key || node == m_stop)
return;
if (node->object == object)
break;
}
// Update all links
for (level = m_level; level >= 1; --level) {
if (update[level]->next[level] != node)
continue;
update[level]->next[level] = node->next[level];
}
ASSERT(update[0]->next[0] == node);
node->next[0]->prev = update[0];
update[0]->next[0] = node->next[0];
// Update header
while (m_level && m_head->next[m_level] == m_stop)
--m_level;
FreeNode(node);
}
//============================================================================
template<class T, class K, unsigned keyOffset, class Cmp>
void TSkipList<T,K,keyOffset,Cmp>::UnlinkAll () {
Node * ptr = m_head->next[0];
while (ptr != m_stop) {
Node * next = ptr->next[0];
FreeNode(ptr);
ptr = next;
}
m_stop->prev = m_head;
for (unsigned index = 0; index < kMaxLevels; ++index)
m_head->next[index] = m_stop;
m_level = 0;
}