583 lines
13 KiB
C++
583 lines
13 KiB
C++
/*=============================================================================
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# Filename: VNode.cpp
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# Author: Bookug Lobert
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# Mail: zengli-bookug@pku.edu.cn
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# Last Modified: 2016-04-11 14:08
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# Description: by liyouhuan and hanshuo
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=============================================================================*/
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#include "VNode.h"
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using namespace std;
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VNode::VNode()
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{
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//this->is_leaf = false;
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//this->is_root = false;
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//this->child_num = 0;
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this->flag = 0;
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this->self_file_line = -1;
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this->father_file_line = -1;
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this->child_file_lines = new int[VNode::MAX_CHILD_NUM];
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for(int i = 0; i < VNode::MAX_CHILD_NUM; i ++)
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{
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this->child_file_lines[i] = -1;
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}
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InitLock();
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}
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VNode::VNode(bool _is_leaf)
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{
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//this->is_leaf = false;
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//this->is_root = false;
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//this->child_num = 0;
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this->flag = 0;
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this->self_file_line = -1;
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this->father_file_line = -1;
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if(_is_leaf)
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{
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this->child_file_lines = NULL;
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//return;
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}
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else
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{
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this->AllocChilds();
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}
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InitLock();
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}
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VNode::~VNode()
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{
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delete[] this->child_file_lines;
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this->child_file_lines = NULL;
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#ifdef THREAD_ON
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pthread_mutex_destroy(&(this->node_lock));
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#endif
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}
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void
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VNode::AllocChilds()
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{
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this->child_file_lines = new int[VNode::MAX_CHILD_NUM];
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for(int i = 0; i < VNode::MAX_CHILD_NUM; i ++)
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{
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this->child_file_lines[i] = -1;
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}
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}
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void
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VNode::InitLock()
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{
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#ifdef THREAD_ON
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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pthread_mutex_init(&(this->node_lock), &attr);
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#endif
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}
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void
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VNode::setFlag(unsigned _flag)
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{
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this->flag = _flag;
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}
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bool
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VNode::isDirty() const
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{
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return this->flag & VNode::DIRTY_PART;
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}
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void
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VNode::setDirty(bool _flag)
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{
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if(_flag)
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{
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this->flag |= VNode::DIRTY_PART;
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}
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else
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{
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this->flag &= VNode::DEL_DIRTY_PART;
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}
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}
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bool
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VNode::isLeaf() const
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{
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return this->flag & VNode::LEAF_PART;
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}
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bool
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VNode::isRoot() const
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{
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return this->flag & VNode::ROOT_PART;
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}
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bool
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VNode::isFull() const
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{
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return (this->getChildNum() == VNode::MAX_CHILD_NUM - 1); // need one slot for splitting node.
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}
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void
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VNode::setAsLeaf(bool _isLeaf)
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{
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if(_isLeaf)
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{
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this->flag |= VNode::LEAF_PART;
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}
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else
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{
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this->flag &= VNode::DEL_LEAF_PART;
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}
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}
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void
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VNode::setAsRoot(bool _isRoot)
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{
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if(_isRoot)
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{
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this->flag |= VNode::ROOT_PART;
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}
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else
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{
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this->flag &= VNode::DEL_ROOT_PART;
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}
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//this->setDirty();
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}
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int
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VNode::getChildNum() const
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{
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//return this->child_num;
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return this->flag & VNode::NUM_PART;
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}
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int
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VNode::getFileLine() const
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{
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return this->self_file_line;
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}
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int
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VNode::getFatherFileLine() const
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{
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return this->father_file_line;
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}
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int
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VNode::getChildFileLine(int _i) const
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{
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return this->child_file_lines[_i];
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}
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void
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VNode::setChildNum(int _num)
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{
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//this->child_num = _num;
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this->flag &= VNode::DEL_NUM_PART;
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this->flag |= _num;
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//this->setDirty();
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}
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void
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VNode::setFileLine(int _line)
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{
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this->self_file_line = _line;
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//this->setDirty();
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}
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void VNode::setFatherFileLine(int _line)
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{
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this->father_file_line = _line;
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}
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void VNode::setChildFileLine(int _i, int _line)
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{
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this->child_file_lines[_i] = _line;
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}
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const SigEntry& VNode::getEntry()const
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{
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return this->entry;
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}
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const SigEntry& VNode::getChildEntry(int _i)const
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{
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return this->child_entries[_i];
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}
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void VNode::setEntry(const SigEntry _entry)
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{
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this->entry = _entry;
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}
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void VNode::setChildEntry(int _i, const SigEntry _entry)
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{
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/* _entry should not be an ref, because if _entry is an ref,
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* it's possible that _entry is exactly an ref of this->child_entries[i]
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* !!!!!!!!!!!!!!!!!!!! */
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SigEntry _sig(_entry);
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this->child_entries[_i] = _sig;
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//debug
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// {
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// if (this->getFileLine() == 0 && this->getChildFileLine(_i) == 153)
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// {
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// Util::logging("set node 0's child node 153's entry:");
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// Util::logging(Signature::BitSet2str(this->child_entries[_i].getEntitySig().entityBitSet));
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// }
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// }
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}
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VNode* VNode::getFather(LRUCache& _nodeBuffer)const
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{
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if (this->isRoot())
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{
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return NULL;
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}
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return _nodeBuffer.get(this->getFatherFileLine());
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}
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VNode* VNode::getChild(int _i, LRUCache& _nodeBuffer)const
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{
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if (this->isLeaf())
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{
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return NULL;
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}
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return _nodeBuffer.get(this->getChildFileLine(_i));
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}
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/* add one child entry to this node. when splitting this node, can add a new entry to it. */
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bool VNode::addChildEntry(const SigEntry _entry, bool _is_splitting)
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{
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//if (this->isFull() && !_is_splitting)
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//{
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//cerr<< "error, can not add child entry when the node is full, in VNode::addChildEntry." << endl;
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//return false;
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//}
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int child_num = this->getChildNum();
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this->setChildEntry(child_num, _entry);
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//this->child_num ++;
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this->setChildNum(child_num+1);
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return true;
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}
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/* add one child node to this node. when splitting this node, can add a new child to it. */
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bool VNode::addChildNode(VNode* _p_child_node, bool _is_splitting)
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{
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//if (this->isFull() && !_is_splitting)
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//{
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//cerr<< "error, can not add child when the node is full. @VNode::addChildNode" << endl;
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//return false;
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//}
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//if (_p_child_node == NULL)
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//{
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//cerr<< "error, can not add child when the child node pointer is NULL. @VNode::addChildNode" << endl;
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//return false;
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//}
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int child_num = this->getChildNum();
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_p_child_node->setFatherFileLine(this->self_file_line);
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_p_child_node->setDirty();
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this->setChildFileLine(child_num, _p_child_node->getFileLine());
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this->addChildEntry( _p_child_node->getEntry(), _is_splitting);
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//NOTICE:this function calls addChildEntry(), which already add the child_num
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//this->child_num ++;
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return true;
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}
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bool VNode::removeChild(int _i)
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{
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int child_num = this->getChildNum();
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if (_i < 0 || _i >= child_num)
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{
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cerr<< "error, illegal child index. @VNode::removeChild" << endl;
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return false;
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}
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if(this->isLeaf())
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{
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for (int j = _i + 1; j < child_num; ++j)
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{
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child_entries[j-1] = child_entries[j];
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//child_file_lines[j-1] = child_file_lines[j];
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}
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}
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else
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{
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for (int j = _i + 1; j < child_num; ++j)
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{
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child_entries[j-1] = child_entries[j];
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child_file_lines[j-1] = child_file_lines[j];
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}
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}
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//this->child_num --;
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this->setChildNum(child_num-1);
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return true;
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}
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int VNode::getIndexInFatherNode(LRUCache& _nodeBuffer)
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{
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VNode * fatherNodePtr = this->getFather(_nodeBuffer);
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if (fatherNodePtr == NULL)
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{
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return 0;
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}
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int n = fatherNodePtr->getChildNum();
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for (int i = 0; i < n; i++)
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{
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if (fatherNodePtr->getChildFileLine(i) == this->self_file_line)
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{
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#ifdef THREAD_ON
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pthread_mutex_unlock(&(fatherNodePtr->node_lock));
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#endif
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return i;
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}
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}
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#ifdef THREAD_ON
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pthread_mutex_unlock(&(fatherNodePtr->node_lock));
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#endif
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cerr << "error, can not find rank in father node. @VNode::getIndexInFatherNode" << endl;
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return 0;
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}
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void VNode::refreshSignature()
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{
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EntitySig sig;
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int child_num = this->getChildNum();
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for (int i = 0; i < child_num; i++)
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{
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sig |= this->child_entries[i].getEntitySig();
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}
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// refresh self node's signature.
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if (sig != this->entry.getEntitySig())
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{
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SigEntry newEntry(sig, this->entry.getEntityId());
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this->setEntry(newEntry);
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}
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}
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void VNode::refreshAncestorSignature(LRUCache& _nodeBuffer)
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{
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// refresh self node's signature.
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this->refreshSignature();
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// refresh father node's signature.
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#ifdef DEBUG_VSTREE
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//cout<<"VNode::refreshAncestorSignature() - to get father"<<endl;
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#endif
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VNode* fatherNodePtr = this->getFather(_nodeBuffer);
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if (fatherNodePtr == NULL)
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{
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if (!this->isRoot())
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cerr << "error, can not find father node. @VNode::refreshSignature" << endl;
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return;
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}
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int rank = this->getIndexInFatherNode(_nodeBuffer);
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if (fatherNodePtr->getChildEntry(rank).getEntitySig() != this->entry.getEntitySig())
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{
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fatherNodePtr->setDirty();
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fatherNodePtr->setChildEntry(rank, this->entry);
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fatherNodePtr->refreshAncestorSignature(_nodeBuffer);
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}
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#ifdef THREAD_ON
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pthread_mutex_unlock(&(fatherNodePtr->node_lock));
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#endif
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}
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bool VNode::retrieveChild(vector<VNode*>& _child_vec, const EntitySig _filter_sig, LRUCache& _nodeBuffer)
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{
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if (this->isLeaf())
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{
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cerr << "error, can not retrieve children from a leaf node.@VNode::retrieveChild" << endl;
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return false;
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}
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int child_num = this->getChildNum();
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for (int i = 0; i < child_num; i++)
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{
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if (this->child_entries[i].cover(_filter_sig))
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{
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_child_vec.push_back(this->getChild(i, _nodeBuffer));
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}
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}
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return true;
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}
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bool VNode::retrieveEntry(vector<SigEntry>& _entry_vec, const EntitySig _filter_sig, LRUCache& _nodeBuffer)
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{
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if (!this->isLeaf())
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{
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cerr << "error, can not retrieve entries from a non-leaf node. @VNode::retrieveEntry" << endl;
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return false;
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}
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int child_num = this->getChildNum();
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for (int i = 0 ; i < child_num; i++)
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{
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if (this->child_entries[i].cover(_filter_sig))
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{
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_entry_vec.push_back(this->child_entries[i]);
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}
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}
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return false;
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}
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bool VNode::checkState()
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{
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if (this->getFileLine() < 0)
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return false;
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int child_num = this->getChildNum();
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for (int i = 0; i < child_num; i++)
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if (!this->isLeaf() && this->getChildFileLine(i) < 0)
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{
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return false;
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}
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return true;
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}
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std::string VNode::to_str()
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{
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std::stringstream _ss;
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_ss << "VNode:" << endl;
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_ss << "\tEntityID:" << entry.getEntityId() << endl;
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_ss << "\tisLeaf:" << this->isLeaf() << endl;
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_ss << "\tisRoot:" << this->isRoot() << endl;
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_ss << "\tfileline:" << this->self_file_line << endl;
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_ss << "\tsignature:" <<
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Signature::BitSet2str(this->entry.getEntitySig().entityBitSet ) << endl;
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int child_num = this->getChildNum();
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_ss << "\tchildNum:" << child_num << endl << "\t";
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for(int i = 0; i < child_num; i ++)
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{
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if(! this->isLeaf()){
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_ss << "[" << this->getChildFileLine(i) << "]\t";
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}
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else
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{
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_ss << i << "[*" << this->getChildEntry(i).getEntityId() << "]\t";
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_ss << (this->getChildEntry(i).to_str()) << endl;
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}
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_ss << "\t" << this->child_entries[i].to_str() << endl;
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}
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_ss << endl << endl;
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return _ss.str();
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}
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//TODO: keep a lock for each node, but not write to disk
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bool
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VNode::readNode(FILE* _fp)
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{
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int ret = fread(&(this->flag), sizeof(unsigned), 1, _fp);
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if(ret == 0) //the edn of file
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{
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return false;
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}
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fread(&(this->self_file_line), sizeof(int), 1, _fp);
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//cout<<"to read node: "<<this->self_file_line<<endl;
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//BETTER:if the id < 0, then just move, not read
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fread(&(this->father_file_line), sizeof(int), 1, _fp);
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fread(&(this->entry), sizeof(SigEntry), 1, _fp);
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//for(int i = 0; i < VNode::MAX_CHILD_NUM; ++i)
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//{
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//fread(&(this->child_entries[i]), sizeof(SigEntry), 1, _fp);
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//}
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fread(this->child_entries, sizeof(SigEntry), VNode::MAX_CHILD_NUM, _fp);
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if(!this->isLeaf()) //internal node
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{
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this->child_file_lines = new int[VNode::MAX_CHILD_NUM];
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//for(int i = 0; i < VNode::MAX_CHILD_NUM; ++i)
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//{
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//fread(&(this->child_file_lines[i]), sizeof(int), 1, _fp);
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//}
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fread(this->child_file_lines, sizeof(int), VNode::MAX_CHILD_NUM, _fp);
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}
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else //move to the end of the node block
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{
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fseek(_fp, sizeof(int) * VNode::MAX_CHILD_NUM, SEEK_CUR);
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}
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//this->setDirty(false);
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return true;
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}
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bool
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VNode::writeNode(FILE* _fp)
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{
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//clean, then no need to write
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//if(!this->isDirty())
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//{
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//return true;
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//}
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//NOTICE:already dealed in LRUCache
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//this->setDirty(false);
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//cout<<"to write node: "<<this->self_file_line<<endl;
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fwrite(&(this->flag), sizeof(unsigned), 1, _fp);
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fwrite(&(this->self_file_line), sizeof(int), 1, _fp);
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//NOTICE: this must be a old node(not new inserted node), so no need to write more
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if(this->self_file_line < 0)
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{
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return true;
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}
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fwrite(&(this->father_file_line), sizeof(int), 1, _fp);
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fwrite(&(this->entry), sizeof(SigEntry), 1, _fp);
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//for(int i = 0; i < VNode::MAX_CHILD_NUM; ++i)
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//{
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//fwrite(&(this->child_entries[i]), sizeof(SigEntry), 1, _fp);
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//}
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fwrite(this->child_entries, sizeof(SigEntry), VNode::MAX_CHILD_NUM, _fp);
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if(!this->isLeaf()) //internal node
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|
{
|
|
//for(int i = 0; i < VNode::MAX_CHILD_NUM; ++i)
|
|
//{
|
|
//fwrite(&(this->child_file_lines[i]), sizeof(int), 1, _fp);
|
|
//}
|
|
fwrite(this->child_file_lines, sizeof(int), VNode::MAX_CHILD_NUM, _fp);
|
|
}
|
|
else //move to the end of the node block
|
|
{
|
|
//fseek(_fp, sizeof(int) * VNode::MAX_CHILD_NUM, SEEK_CUR);
|
|
int t = 0;
|
|
for(int i = 0; i < VNode::MAX_CHILD_NUM; ++i)
|
|
{
|
|
fwrite(&t, sizeof(int), 1, _fp);
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|