include/SqlLogConnection.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Prabakaran Thirumalai   *
   3  *   praba_tuty@yahoo.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  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifndef SQLLOGCONNECTION_H
  21 #define SQLLOGCONNECTION_H
  22 #include<CSql.h>
  23 #include<SqlFactory.h>
  24 #include<Util.h>
  25 #include<Network.h>
  26
  27 /**
  28 * @class SqlLogConnection
  29 *
  30 */
  31
  32 class AbsSqlLogSend
  33 {
  34     public:
  35     virtual DbRetVal prepare(int txnId, int stmtId, int len, char *stmt)=0;
  36     virtual DbRetVal commit(int len, void *data)=0;
  37     virtual DbRetVal free(int txnId, int stmtId)=0;
  38 };
  39
  40 class FileSend : public AbsSqlLogSend
  41 {
  42     int fdRedoLog;
  43     public:
  44     FileSend();
  45     DbRetVal prepare(int txnId, int stmtId, int len, char *stmt);
  46     DbRetVal commit(int len, void *data);
  47     DbRetVal free(int txnId, int stmtId);
  48 };
  49
  50 enum ExecType
  51 {
  52     EXECONLY = 0,
  53     SETPARAM
  54 };
  55
  56 class ExecLogInfo
  57 {
  58     public:
  59     ExecLogInfo() : pos(0), len(0) {}
  60     int stmtId;
  61     ExecType type;
  62     int pos;
  63     DataType dataType;
  64     int len;
  65     char value[1];
  66 };
  67
  68 class SqlLogConnection : public AbsSqlConnection
  69 {
  70     Connection dummyConn;
  71
  72     //stores all the sql log packets to be shipped to peers
  73     List logStore;
  74
  75     List execLogStore;
  76     int execLogStoreSize;
  77
  78     //stores all the prepare log packets to be shipped to peers
  79     //as soon as connection is reestablished to cache server
  80     List prepareStore;
  81
  82     //stores all the prepare log packets to be shipped between two
  83     //consecutive commits. Commit() call sends first all the stmts
  84     //prepared during the course and then sends the exec pkts
  85     List curPrepareStore;
  86
  87     //sync mode of the current transaction
  88     TransSyncMode syncMode;
  89
  90     //stores client objects in it for peer
  91     NetworkTable nwTable;
  92     AbsSqlLogSend *fileSend;
  93
  94     static GlobalUniqueID txnUID;
  95     static List cacheList;
  96     int txnID;
  97     DbRetVal populateCachedTableList();
  98     public:
  99     SqlLogConnection() {
 100         innerConn = NULL; syncMode = ASYNC;
 101         if (Conf::config.useDurability()) { fileSend = new FileSend(); }
 102         execLogStoreSize =0;
 103     }
 104     bool isTableCached(char *name);
 105
 106     //Note::forced to implement this as it is pure virtual in base class
 107     Connection& getConnObject(){  return dummyConn; }
 108
 109     DbRetVal connect (char *user, char * pass);
 110
 111     DbRetVal disconnect();
 112
 113     DbRetVal commit();
 114
 115     DbRetVal rollback();
 116
 117     DbRetVal beginTrans (IsolationLevel isoLevel, TransSyncMode mode);
 118
 119     DbRetVal fileLogPrepare(int txnId, int stmtId, int len, char *stmt)
 120     {
 121         return fileSend->prepare(txnId, stmtId, len, stmt);
 122     }
 123     DbRetVal commitLogs(int logSize, void *data)
 124     {
 125         int txnId = getTxnID();
 126         if (Conf::config.useDurability()) fileSend->commit(logSize, data);
 127         return OK;
 128     }
 129     DbRetVal freeLogs(int stmtId)
 130     {
 131         int txnId = getTxnID();
 132         if (Conf::config.useDurability()) fileSend->free(txnId, stmtId);
 133         return OK;
 134     }
 135     void addExecLog(ExecLogInfo *info) { execLogStore.append(info); }
 136     void addToExecLogSize(int size){ execLogStoreSize += size; }
 137     int getExecLogStoreSize() { return execLogStoreSize; }
 138     List getExecLogList() { return execLogStore; }
 139     DbRetVal addPacket(BasePacket *pkt);
 140     DbRetVal addPreparePacket(PacketPrepare *pkt);
 141     DbRetVal removePreparePacket(int stmtid);
 142
 143     DbRetVal setSyncMode(TransSyncMode mode);
 144     TransSyncMode getSyncMode() { return syncMode; }
 145     int getTxnID() { return txnID; }
 146     DbRetVal connectIfNotConnected() { return nwTable.connectIfNotConnected(); }
 147     DbRetVal sendAndReceive(NetworkPacketType type, char *packet, int length);
 148     friend class SqlFactory;
 149 };
 150
 151 #endif