X-Git-Url: https://git.llucax.com/z.facultad/75.52/treemulator.git/blobdiff_plain/265f02295fbe804ba40153117fdc7374590810d8..52d9e098f15ad0ca70f11b4549f3d55f55a22a83:/src/btree.cpp?ds=sidebyside diff --git a/src/btree.cpp b/src/btree.cpp index 8f18c66..81b2fc9 100644 --- a/src/btree.cpp +++ b/src/btree.cpp @@ -50,38 +50,137 @@ void BTree::WriteBlock (uchar *block, uint num) void BTree::AddKey (const Clave &k) { - AddKeyR (&k, 0); + uint left, right; + Clave *kout = AddKeyR (&k, 0, left, right); + + if (kout) { + std::cout << "Raiz fue spliteada!!" << std::endl; + } } -Clave* BTree::AddKeyR (const Clave *k, uint node_num) +Clave* BTree::AddKeyR (const Clave *k, uint node_num, uint &left_child, uint &right_child) { Clave *kout = NULL; std::list node_keys; + BTreeLeafData data (k->Clone ()); + /* Leo el nodo raiz para empezar a agregar */ uchar *node = ReadBlock (node_num); BTreeNodeHeader node_header; ReadNodoHeader (node, &node_header); - node_keys = ReadKeys (node, node_header); - - if (node_header.free_space >= k->Size ()) { + if (node_header.level != 0) { + /* No estoy en una hoja, asi que tengo que buscar + * para donde moverme para agregar la clave + */ + /* TODO :) */ + } + + + /* Estoy en una hoja, veo si lo puedo agregar */ + + if (node_header.free_space > data.Size ()) { /* TODO : Insertar ordenado */ - /* Siempre se agrega en una hoja */ - node_keys.push_back (BTreeLeafData (k->Clone ())); + BTreeData datait; + + node_keys = ReadKeys (node, node_header); + std::list::iterator it = node_keys.begin (); + while (it != node_keys.end ()) { + datait = (*it); + if (data < datait) + /* Me pase, lo agrego aca! */ + break; + it++; + } + node_keys.insert (it, data); WriteKeys (node, node_header, node_keys); WriteNodoHeader (node, &node_header); WriteBlock (node, node_num); - delete [] node; + + PrintNode (node_num); } else { - /* Split */ - /* Lo que debe pasar : - * 1) Separar N/2 claves en "nodo" - * 2) Separar N/2-1 claves en un nuevo nodo - * 3) kout = clave del medio y mandarla al padre - */ - std::cout << "SPLIT" << std::endl; + std::cout << "=============== SPLIT ================" << std::endl; + /* Split : Creo e inicializo el nuevo nodo */ + std::list new_node_keys; + std::list old_node_keys; + BTreeNodeHeader new_node_header; + uint new_node_num; + uchar *new_node = NewBlock (new_node_num); + ReadNodoHeader (new_node, &new_node_header); + + node_keys = ReadKeys (node, node_header); + new_node_keys = ReadKeys (new_node, new_node_header); + + /* Agrego la clave en la lista que ya tengo de manera ordenada */ + std::list::iterator it = node_keys.begin (); + + while (it != node_keys.end ()) { + BTreeData datait; + datait = (*it); + if (data < datait) + /* Me pase, lo agrego aca! */ + break; + it++; + } + if (it != node_keys.end ()) + node_keys.insert (it, data); + else + node_keys.push_back (data); + + /* Tengo que guardar claves hasta ocupar nodo size/2 en cada nodo + * y subir la clave del medio */ + node_header.item_count = 0; + node_header.free_space = header.block_size - sizeof (BTreeNodeHeader); + + uint total_size = 0; + it = node_keys.begin (); + while (it != node_keys.end ()) { + BTreeData datait; + datait = (*it); + total_size += datait.Size (); + it++; + /* Hack : Si me quedo con todas las claves, en el caso de ser + * del mismo tama#o se desbalancea. Hay que ver que efecto + * puede tener en el caso de claves de long. variable + */ + if (it == node_keys.end ()) + total_size -= datait.Size (); + } + + it = node_keys.begin (); + uint used = 0; + while (used < total_size/2) { + BTreeData d = (*it); + std::cout << used << " " << total_size << std::endl; + old_node_keys.push_back (d); + used += d.Size (); + it++; + } + kout = (*it++).getClave (); // Esta se retorna al "padre" para que se la agregue + while (it != node_keys.end ()) { + BTreeData d = (*it); + new_node_keys.push_back (d); + it++; + } + + /* Guardo */ + WriteKeys (node, node_header, old_node_keys); + WriteNodoHeader (node, &node_header); + WriteBlock (node, node_num); + WriteKeys (new_node, new_node_header, new_node_keys); + WriteNodoHeader (new_node, &new_node_header); + WriteBlock (new_node, new_node_num); + + PrintNode (node_num); + PrintNode (new_node_num); + + /* Paso los hijos */ + left_child = node_num; + right_child = new_node_num; + delete [] new_node; + delete [] node; } return kout; @@ -120,7 +219,11 @@ std::list BTree::ReadKeys (uchar *node, BTreeNodeHeader &node_header) * arbol */ /* TODO : Detectar si estoy en una hoja */ - BTreeData data(node); + BTreeData data; + if (node_header.level == 0) + data = BTreeLeafData (node); + else + data = BTreeData (node); node += data.Size (); keys.push_back (data); } @@ -148,3 +251,48 @@ void BTree::WriteKeys (uchar *node, BTreeNodeHeader &node_header, std::list node_keys = ReadKeys (node, node_header); + std::list::iterator it = node_keys.begin (); + + std::cout << "Nodo : " << num << std::endl; + std::cout << "Items : " << node_header.item_count << std::endl; + std::cout << "Free : " << node_header.free_space << " (" << (header.block_size - sizeof (BTreeNodeHeader)) << ")" << std::endl; + while (it != node_keys.end ()) { + std::string s = (*it); + std::cout << "(" << s << ") "; + it++; + } + std::cout << std::endl; + + delete [] node; +} + +uchar *BTree::NewBlock (uint &num) +{ + long filelen; + uchar *node; + BTreeNodeHeader nh; + + fseek (fp, 0, SEEK_END); + filelen = ftell (fp); + + num = (filelen - sizeof (BTreeFileHeader))/header.block_size; + + node = new uchar[header.block_size]; + ReadNodoHeader (node, &nh); + nh.level = 0; + nh.free_space = header.block_size - sizeof (BTreeNodeHeader); + nh.item_count = 0; + WriteNodoHeader (node, &nh); + WriteBlock (node, 0); + + return node; +} +