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     void print() {
  52        printf("<UndoLogInfo>\n");
  53        printf("  <Size> %d </Size>\n", size_);
  54        printf("  <OperationType> %d </OperationType>\n", opType_);
  55        printf("  <TuplePtr> %x </TuplePtr>\n", ptrToTuple_);
  56        printf("</UndoLogInfo>\n");
  57
  58     }
  59 };
  60
  61 class Transaction
  62 {
  63     public:
  64     int status_;
  65
  66     IsolationLevel isoLevel_;
  67
  68     TransHasNode *hasLockList_;
  69
  70     UndoLogInfo *firstUndoLog_;
  71
  72     LockHashNode *waitLock_;
  73
  74     DbRetVal releaseAllLocks(LockManager *lockManager_);
  75
  76     void updateWaitLock(LockHashNode *node) { waitLock_ = node; }
  77     void removeWaitLock() { waitLock_ = NULL; }
  78     DbRetVal insertIntoHasList(Database *sysdb, LockHashNode *node);
  79     DbRetVal removeFromHasList(Database *sysdb, void *tuple);
  80     bool findInHasList(Database *sysdb, LockHashNode *node);
  81
  82     DbRetVal appendUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
  83     DbRetVal appendLogicalUndoLog(Database *sysdb, OperationType type, void *data,
  84                        size_t size, void* indexPtr);
  85     UndoLogInfo* createUndoLog(Database *sysdb, OperationType type, void *data,
  86                        size_t size, DbRetVal *rv);
  87     void addAtBegin(UndoLogInfo* logInfo);
  88
  89     UndoLogInfo* popUndoLog();
  90     DbRetVal removeUndoLogs(Database *sysdb);
  91     DbRetVal applyUndoLogs(Database *sysdb);
  92     int noOfUndoLogs();
  93     void printDebugInfo(Database *sysdb);
  94 };
  95
  96 class TransactionManager
  97 {
  98     public:
  99     TransactionManager() {  }
 100     ~TransactionManager() {}
 101     //Transaction *trans;
 102
 103     Transaction *firstTrans;
 104
 105     void setFirstTrans(Transaction *trans);
 106     void printUsageStatistics();
 107     void printDebugInfo(Database *sysdb);
 108
 109     DbRetVal startTransaction(LockManager *lManager, IsolationLevel level);
 110     DbRetVal commit(LockManager *lManager);
 111     DbRetVal rollback(LockManager *lManager, Transaction *t=NULL);
 112
 113 };
 114 #endif