include/DatabaseManagerImpl.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 DATABASE_MANAGER_IMPL_H
  17 #define DATABASE_MANAGER_IMPL_H
  18 #include<os.h>
  19 #include<CatalogTables.h>
  20 #include<Lock.h>
  21 #include<DatabaseManager.h>
  22 #include<Process.h>
  23 //Note::DatabaseManagerImpl is used to hide functionalites from normal database user.
  24 //User is exposed to DatabaseManagerImpl, for our tools we shall type cast DatabaseManager
  25 //to DatabaseManagerImpl to retreive internal information such as db statistics, etc
  26 class Database;
  27 class SessionImpl;
  28 class TableDef;
  29 class Table;
  30 class FieldNameList;
  31 class ChunkIterator;
  32 class Chunk;
  33 class TransactionManager;
  34 class CSqlProcInfo
  35 {
  36     public:
  37     CSqlProcInfo() { sysDbAttachAddr = userDbAttachAddr = NULL;}
  38     void *sysDbAttachAddr;
  39     void *userDbAttachAddr;
  40 };
  41
  42 //Global object
  43 static CSqlProcInfo csqlProcInfo;
  44
  45 class DatabaseManagerImpl : public DatabaseManager
  46 {
  47     private:
  48     Database* systemDatabase_;
  49     //pointer to system Database
  50
  51     Database* db_;
  52     //pointer to database
  53
  54     LockManager *lMgr_;
  55
  56     TransactionManager *tMgr_;
  57
  58
  59     ProcessManager *pMgr_;
  60     int procSlot;
  61
  62     List tableList; // list of table handles
  63
  64     //only SessionImpl creates object of this class
  65     DatabaseManagerImpl() { systemDatabase_ = NULL; tMgr_ = NULL; lMgr_ =  NULL;
  66                             pMgr_ = NULL; db_ = NULL; }
  67     ~DatabaseManagerImpl();
  68
  69     DbRetVal openSystemDatabase();
  70     DbRetVal closeSystemDatabase();
  71     ChunkIterator getSystemTableIterator(CatalogTableID id);
  72     Chunk* getSystemTableChunk(CatalogTableID id);
  73
  74     void createLockManager();
  75     void createTransactionManager();
  76
  77     Chunk* createUserChunk(size_t size = 0);
  78     DbRetVal deleteUserChunk(Chunk *chunk);
  79
  80
  81     DbRetVal createHashIndex(const char *indName, const char *tableName,
  82                         FieldNameList &fldList, int bucketSize, bool isUnique, bool isPrimary = false);
  83     void initHashBuckets(Bucket *buck, int bucketSize);
  84
  85     DbRetVal dropIndexInt(const char *name, bool takeLock);
  86
  87     public:
  88
  89     Database* db() { return db_; }
  90     Database* sysDb() { return systemDatabase_; }
  91     void setSysDb(Database *db) { systemDatabase_ = db; }
  92     void setDb(Database *db) { db_ = db; }
  93
  94     void setProcSlot();
  95     TransactionManager* txnMgr() { return tMgr_; }
  96     LockManager* lockMgr() { return lMgr_; }
  97
  98     //for user database file there is no limit for the number
  99     //of tables or chunks
 100     DbRetVal createDatabase(const char *name, size_t size);
 101     DbRetVal deleteDatabase(const char *name);
 102
 103     DbRetVal openDatabase(const char *name);
 104     DbRetVal closeDatabase();
 105
 106
 107
 108     DbRetVal createTable(const char *name, TableDef &def);
 109     DbRetVal dropTable(const char *name);
 110     Table* openTable(const char *name);
 111     void closeTable(Table *table);
 112     DbRetVal createIndex(const char *indName, IndexInitInfo *info);
 113     DbRetVal dropIndex(const char *name);
 114     List getAllTableNames();
 115
 116     DbRetVal registerThread();
 117     DbRetVal deregisterThread();
 118     bool isAnyOneRegistered();
 119     void printUsageStatistics();
 120     void printDebugLockInfo();
 121     void printDebugTransInfo();
 122     void printDebugChunkInfo();
 123     void printDebugProcInfo();
 124     DbRetVal printIndexInfo(char *name);
 125     friend class SessionImpl;
 126 };
 127 #endif