src_other/tuplebase/ZTS_DB.h

/*  @(#) $Id: ZTS_DB.h,v 1.2 2007/01/30 19:55:28 agreen Exp $ */

/* ------------------------------------------------------------
Copyright (c) 2007 Andrew Green and Learning in Motion, Inc.
http://www.zoolib.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
------------------------------------------------------------ */

#ifndef __ZTS_DB__
#define __ZTS_DB__
#include "zconfig.h"

#include "ZFile.h"
#include "ZTS.h"
#include "ZTupleIndex.h"

#include <string>
#include <vector>

#include <db.h>

// =================================================================================================
#pragma mark -
#pragma mark * ZTS_DB

class ZTS_DB : public ZTS
        {
public:
        ZTS_DB(const ZFileSpec& iFileSpec);
        ZTS_DB(const ZFileSpec& iFileSpec, const std::vector<std::vector<std::string> >& iIndexSpecs);
        virtual ~ZTS_DB();

// From ZTS
        virtual void AllocateIDs(size_t iCount, uint64& oBaseID, size_t& oCount);
        virtual void SetTuples(size_t iCount, const uint64* iIDs, const ZTuple* iTuples);
        virtual void GetTuples(size_t iCount, const uint64* iIDs, ZTuple* oTuples);
        virtual void Search(
                const ZTBSpec& iSpec, const std::set<uint64>& iSkipIDs, std::set<uint64>& ioIDs);
        virtual ZMutexBase& GetReadLock();
        virtual ZMutexBase& GetWriteLock();

// Our protocol
        void Flush();

// Uggh
        void SetNextUnusedID(uint64 iID) { fNextUnusedID = iID; }

private:
        class Index;
        friend class Index;

        bool pGetTuple(uint64 iID, ZTuple& oTuple);
        void pFlush();

        static int sBTree_Compare(const DBT* iLeft, const DBT* iRight);
        static size_t sBTree_Prefix(const DBT* iLeft, const DBT* iRight);

        ZMutex fMutex;
        ZMutex fMutex_ID;
        uint64 fNextUnusedID;
        ZFileSpec fFileSpec;
        bool fChanged;
        DB* fDB;
        vector<ZTupleIndex*> fIndices;
        };

#endif // __ZTS_DB__

---