TransactionalCacheAccessor.h

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00001 /*
00002 // $Id: //open/dev/fennel/cache/TransactionalCacheAccessor.h#5 $
00003 // Fennel is a library of data storage and processing components.
00004 // Copyright (C) 2008-2009 The Eigenbase Project
00005 // Copyright (C) 2008-2009 SQLstream, Inc.
00006 // Copyright (C) 2008-2009 LucidEra, Inc.
00007 //
00008 // This program is free software; you can redistribute it and/or modify it
00009 // under the terms of the GNU General Public License as published by the Free
00010 // Software Foundation; either version 2 of the License, or (at your option)
00011 // any later version approved by The Eigenbase Project.
00012 //
00013 // This program is distributed in the hope that it will be useful,
00014 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00015 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016 // GNU General Public License for more details.
00017 //
00018 // You should have received a copy of the GNU General Public License
00019 // along with this program; if not, write to the Free Software
00020 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00021 */
00022 
00023 #ifndef Fennel_TransactionalCacheAccessor_Included
00024 #define Fennel_TransactionalCacheAccessor_Included
00025 
00026 #include "fennel/cache/DelegatingCacheAccessor.h"
00027 
00028 FENNEL_BEGIN_NAMESPACE
00029 
00038 class FENNEL_CACHE_EXPORT TransactionalCacheAccessor
00039     : public DelegatingCacheAccessor
00040 {
00041     TxnId implicitTxnId;
00042 
00043 public:
00049     explicit TransactionalCacheAccessor(
00050         SharedCacheAccessor pDelegate);
00051     virtual ~TransactionalCacheAccessor();
00052 
00053     // implement the CacheAccessor interface
00054     virtual CachePage *lockPage(
00055         BlockId blockId,
00056         LockMode lockMode,
00057         bool readIfUnmapped = true,
00058         MappedPageListener *pMappedPageListener = NULL,
00059         TxnId txnId = IMPLICIT_TXN_ID);
00060     virtual void unlockPage(
00061         CachePage &page,LockMode lockMode,TxnId txnId = IMPLICIT_TXN_ID);
00062     virtual void setTxnId(TxnId txnId);
00063     virtual TxnId getTxnId() const;
00064 };
00065 
00066 FENNEL_END_NAMESPACE
00067 
00068 #endif
00069 
00070 // End TransactionalCacheAccessor.h

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