include/Transaction.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by www.databasecache.com                           *
   3  *   Contact: praba_tuty@databasecache.com                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15   ***************************************************************************/
  16 #ifndef TXN_H
  17 #define TXN_H
  18 #include<os.h>
  19 #include<Debug.h>
  20 #include<Session.h>
  21 class LockHashNode;
  22
  23 enum TransStatus
  24 {
  25     TransNotUsed          =  0,
  26     TransCommitting       =  1,
  27     TransAborting         =  2,
  28     TransRunning          =  3,
  29     TransUnknown          =  4,
  30     TransReserved         =  5
  31 };
  32 class TransHasNode;
  33 class LockManager;
  34 class Database;
  35
  36 enum OperationType
  37 {
  38     InsertOperation = 0,
  39     DeleteOperation = 1,
  40     UpdateOperation = 2,
  41     InsertHashIndexOperation = 3,
  42     UpdateHashIndexOperation = 4,
  43     DeleteHashIndexOperation = 5,
  44     InsertTreeIndexOperation = 6,
  45     UpdateTreeIndexOperation = 7,
  46     DeleteTreeIndexOperation = 8,
  47     InsertTrieIndexOperation = 9,
  48     UpdateTrieIndexOperation = 10,
  49     DeleteTrieIndexOperation = 11
  50 };
  51 class UndoLogInfo
  52 {
  53     public:
  54     int size_;
  55     OperationType opType_;
  56     void *data_;
  57     UndoLogInfo *next_;
  58     void print() {
  59        printf("<UndoLogInfo>\n");
  60        printf("  <Size> %d </Size>\n", size_);
  61        printf("  <OperationType> %d </OperationType>\n", opType_);
  62        printf("  <TuplePtr> %x </TuplePtr>\n", (void *) *(long *)data_);
  63        printf("</UndoLogInfo>\n");
  64
  65     }
  66 };
  67
  68 class HashUndoLogInfo
  69 {
  70     public:
  71     void *tuple_;
  72     void *metaData_;
  73     void *keyPtr_;
  74     void *hChunk_;
  75     void *bucket_;
  76     HashUndoLogInfo()
  77     { metaData_ = tuple_ = keyPtr_ = hChunk_ = bucket_ = NULL; }
  78 };
  79
  80 class TreeUndoLogInfo
  81 {
  82     public:
  83     void *tuple_;
  84     void *metaData_;
  85     //void *keyPtr_;
  86     void *cIndex_;//CINDEX ptr
  87     TreeUndoLogInfo()
  88     { metaData_ = tuple_ = cIndex_ = NULL; }
  89 };
  90 class TrieUndoLogInfo:public HashUndoLogInfo
  91 {
  92 };
  93
  94 class DllExport Transaction
  95 {
  96     public:
  97     InUse status_;
  98
  99     IsolationLevel isoLevel_;
 100
 101     TransHasNode *hasLockList_;
 102
 103     UndoLogInfo *firstUndoLog_;
 104
 105     LockHashNode *waitLock_;
 106
 107     DbRetVal releaseAllLocks(LockManager *lockManager_);
 108
 109     void updateWaitLock(LockHashNode *node) { waitLock_ = node; }
 110     void removeWaitLock() { waitLock_ = NULL; }
 111     DbRetVal insertIntoHasList(Database *sysdb, LockHashNode *node);
 112     DbRetVal removeFromHasList(Database *sysdb, void *tuple);
 113     bool findInHasList(Database *sysdb, LockHashNode *node);
 114
 115     DbRetVal appendUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
 116     DbRetVal appendLogicalUndoLog(Database *sysdb, OperationType type, void *data, size_t size, void *indexPtr);
 117     DbRetVal appendLogicalHashUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
 118     DbRetVal appendLogicalTreeUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
 119     DbRetVal appendLogicalTrieUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
 120     UndoLogInfo* createUndoLog(Database *sysdb, OperationType type, void *data,
 121                        size_t size, DbRetVal *rv);
 122     void addAtBegin(UndoLogInfo* logInfo);
 123
 124     UndoLogInfo* popUndoLog();
 125     DbRetVal removeUndoLogs(Database *sysdb);
 126     DbRetVal applyUndoLogs(Database *sysdb);
 127     int noOfUndoLogs();
 128     void printDebugInfo(Database *sysdb);
 129
 130     private:
 131     DbRetVal handleVarcharUndoInsert(Database *sysdb, char *data);
 132     DbRetVal handleVarcharUndoDelete(Database *sysdb, char *data);
 133     DbRetVal handleVarcharUndoUpdate(Database *sysdb, char *data,void *ptrToTuple);
 134 };
 135
 136 class DllExport TransactionManager
 137 {
 138     public:
 139     TransactionManager() {  }
 140     ~TransactionManager() {}
 141     //Transaction *trans;
 142
 143     Transaction *firstTrans;
 144     IsolationLevel getIsoLevel() {
 145         if(firstTrans) return firstTrans->isoLevel_;
 146         else return READ_COMMITTED;}
 147     void setFirstTrans(Transaction *trans);
 148     void printUsageStatistics();
 149     void printDebugInfo(Database *sysdb);
 150
 151     DbRetVal startTransaction(LockManager *lManager, IsolationLevel level);
 152     DbRetVal commit(LockManager *lManager);
 153     DbRetVal rollback(LockManager *lManager, Transaction *t=NULL);
 154     bool isTransactionConsistent(Database *db);
 155
 156 };
 157 #endif