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 };
  48 class UndoLogInfo
  49 {
  50     public:
  51     int size_;
  52     OperationType opType_;
  53     void *ptrToTuple_;
  54     UndoLogInfo *next_;
  55     void print() {
  56        printf("<UndoLogInfo>\n");
  57        printf("  <Size> %d </Size>\n", size_);
  58        printf("  <OperationType> %d </OperationType>\n", opType_);
  59        printf("  <TuplePtr> %x </TuplePtr>\n", ptrToTuple_);
  60        printf("</UndoLogInfo>\n");
  61
  62     }
  63 };
  64
  65 class HashUndoLogInfo
  66 {
  67     public:
  68     void *metaData_;
  69     void *tuple_;
  70     void *keyPtr_;
  71     void *hChunk_;
  72     void *bucket_;
  73     HashUndoLogInfo()
  74     { metaData_ = tuple_ = keyPtr_ = hChunk_ = bucket_ = NULL; }
  75 };
  76
  77 class TreeUndoLogInfo
  78 {
  79     public:
  80     void *metaData_;
  81     void *tuple_;
  82     //void *keyPtr_;
  83     void *cIndex_;//CINDEX ptr
  84     TreeUndoLogInfo()
  85     { metaData_ = tuple_ = cIndex_ = NULL; }
  86 };
  87
  88 class Transaction
  89 {
  90     public:
  91     int status_;
  92
  93     IsolationLevel isoLevel_;
  94
  95     TransHasNode *hasLockList_;
  96
  97     UndoLogInfo *firstUndoLog_;
  98
  99     LockHashNode *waitLock_;
 100
 101     DbRetVal releaseAllLocks(LockManager *lockManager_);
 102
 103     void updateWaitLock(LockHashNode *node) { waitLock_ = node; }
 104     void removeWaitLock() { waitLock_ = NULL; }
 105     DbRetVal insertIntoHasList(Database *sysdb, LockHashNode *node);
 106     DbRetVal removeFromHasList(Database *sysdb, void *tuple);
 107     bool findInHasList(Database *sysdb, LockHashNode *node);
 108
 109     DbRetVal appendUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
 110     DbRetVal appendLogicalUndoLog(Database *sysdb, OperationType type, void *data, size_t size, void *indexPtr);
 111     DbRetVal appendLogicalHashUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
 112     DbRetVal appendLogicalTreeUndoLog(Database *sysdb, OperationType type, void *data, size_t size);
 113     UndoLogInfo* createUndoLog(Database *sysdb, OperationType type, void *data,
 114                        size_t size, DbRetVal *rv);
 115     void addAtBegin(UndoLogInfo* logInfo);
 116
 117     UndoLogInfo* popUndoLog();
 118     DbRetVal removeUndoLogs(Database *sysdb);
 119     DbRetVal applyUndoLogs(Database *sysdb);
 120     int noOfUndoLogs();
 121     void printDebugInfo(Database *sysdb);
 122 };
 123
 124 class TransactionManager
 125 {
 126     public:
 127     TransactionManager() {  }
 128     ~TransactionManager() {}
 129     //Transaction *trans;
 130
 131     Transaction *firstTrans;
 132     IsolationLevel getIsoLevel() {
 133         if(firstTrans) return firstTrans->isoLevel_;
 134         else return READ_COMMITTED;}
 135     void setFirstTrans(Transaction *trans);
 136     void printUsageStatistics();
 137     void printDebugInfo(Database *sysdb);
 138
 139     DbRetVal startTransaction(LockManager *lManager, IsolationLevel level);
 140     DbRetVal commit(LockManager *lManager);
 141     DbRetVal rollback(LockManager *lManager, Transaction *t=NULL);
 142
 143 };
 144 #endif