src_other/misc/ZTxn.h

/*  @(#) $Id: ZTxn.h,v 1.8 2006/07/23 21:57:38 agreen Exp $ */

/* ------------------------------------------------------------
Copyright (c) 2003 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 __ZTxn__
#define __ZTxn__ 1
#include "zconfig.h"

#include "ZCompat_NonCopyable.h"
#include "ZThread.h"
#include "ZTypes.h"

#include <map>
#include <vector>

class ZTxnTarget;

// =================================================================================================
#pragma mark -
#pragma mark * ZTxn

class ZTxn : ZooLib::NonCopyable
        {
public:
        ZTxn();
        ~ZTxn();

        bool Commit();
        void Abort();

        int32 GetID() const;

private:
        bool pCommit();
        void pAbort();
        void pRegisterTarget(ZTxnTarget* iTarget) const;

        static void sValidateCallback(bool iOkay, void* iRefcon);
        static void sCommitCallback(void* iRefcon);

        int32 fID;

        ZMutex fMutex;
        mutable std::vector<ZTxnTarget*> fTargets;

        friend class ZTxnTarget;
        };

// =================================================================================================
#pragma mark -
#pragma mark * ZTxnTarget

class ZTxnTarget
        {
protected:
        void RegisterWithTxn(const ZTxn& iTxn);

        typedef void (*ValidateCallbackProc)(bool iOkay, void* iRefcon);
        typedef void (*CommitCallbackProc)(void* iRefcon);

        virtual void TxnAbortPreValidate(int32 iTxnID) = 0;
        virtual void TxnValidate(int32 iTxnID, ValidateCallbackProc iCallback, void* iRefcon) = 0;
        virtual void TxnAbortPostValidate(int32 iTxnID, bool iValidationSucceeded) = 0;
        virtual void TxnCommit(int32 iTxnID, CommitCallbackProc iCallback, void* iRefcon) = 0;

        friend class ZTxn;
        };

#endif // __ZTxn__

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