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 };
  31 class TransHasNode;
  32 class LockManager;
  33 class Database;
  34
  35 enum OperationType
  36 {
  37     InsertOperation = 0,
  38     DeleteOperation = 1,
  39     UpdateOperation = 2,
  40     InsertHashIndexOperation = 3,
  41     UpdateHashIndexOperation = 4,
  42     DeleteHashIndexOperation = 5
  43 };
  44 class UndoLogInfo
  45 {
  46     public:
  47     int size_;
  48     OperationType opType_;
  49     void *ptrToTuple_;
  50     UndoLogInfo *next_;
  51 };
  52
  53 class Transaction
  54 {
  55     public:
  56     int status_;
  57
  58     IsolationLevel isoLevel_;
  59
  60     TransHasNode *hasLockList_;
  61
  62     UndoLogInfo *firstUndoLog_;
  63
  64     LockHashNode *waitLock_;
  65
  66     DbRetVal releaseAllLocks(LockManager *lockManager_);
  67
  68     void updateWaitLock(LockHashNode *node) { waitLock_ = node; }
  69     void removeWaitLock() { waitLock_ = NULL; }
  70     DbRetVal insertIntoHasList(Database *sysdb, LockHashNode *node);
  71     DbRetVal removeFromHasList(Database *sysdb, void *tuple);
  72     bool findInHasList(Database *sysdb, LockHashNode *node);
  73
  74     void appendUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
  75     void appendLogicalUndoLog(Database *sysdb, OperationType type, void *data,
  76                        size_t size, void* indexPtr);
  77     UndoLogInfo* createUndoLog(Database *sysdb, OperationType type, void *data,
  78                        size_t size);
  79     void addAtBegin(UndoLogInfo* logInfo);
  80
  81     UndoLogInfo* popUndoLog();
  82     DbRetVal removeUndoLogs(Database *sysdb);
  83     DbRetVal applyUndoLogs(Database *sysdb);
  84 };
  85
  86 class TransactionManager
  87 {
  88     public:
  89     TransactionManager() { trans = NULL; }
  90     ~TransactionManager() {}
  91     Transaction *trans;
  92     Transaction *firstTrans;
  93
  94     void setFirstTrans(Transaction *trans);
  95     void setTrans(Transaction *trans);
  96
  97     DbRetVal startTransaction(IsolationLevel level);
  98     DbRetVal commit(LockManager *lManager_);
  99     DbRetVal rollback(LockManager *lManager_);
 100
 101 };
 102 #endif