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117 lines
3.9 KiB
117 lines
3.9 KiB
// Tranx.h: interface for transaction support.
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// Copyright (c)1997-2001 Microsoft Corporation
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//
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// Original date of creation: 4/09/2001
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// Author: shawnwu
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//////////////////////////////////////////////////////////////////////
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#if _MSC_VER >= 1000
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#pragma once
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#endif // _MSC_VER >= 1000
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#include "precomp.h"
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#include "sceprov.h"
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#include "GenericClass.h"
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/*
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Class description
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Naming:
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CTranxID stands for Transaction ID
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Base class:
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CGenericClass, because it is a class representing a WMI
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object - its WMI class name is Sce_TransactionID
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Purpose of class:
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(1) Sce_TransactionID is the transaction ID that is used for
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providers to identify who is causing its action so that
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we stand a chance to ask that provider to rollback this action.
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Foreign providers should use this ID to identify what they did
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during the transaction. Currently, WMI doesn't have transaction
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support and we need to do it our own. When WMI has that support,
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we can remove this class all together (if no third parties are
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using it).
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(2) CTranxID implements this WMI class Sce_TransactionID so that
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the SCE provider can process request for this WMI class. This
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Sce_TransactionID is a store oriented class, i.e., it is saved
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into a store when PutInst is called to this class.
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Design:
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(1) it implements all pure virtual functions declared in CGenericClass
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so that it is a concrete class to create.
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(2) Since it has virtual functions, the desctructor should be virtual.
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(3) This class is the only one that will create another WMI class called
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Sce_TransactionToken. See function header comments of SpawnTokenInstance.
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Use:
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(1) This class fulfills its obligation to Sce_TransactionID. The use for that
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functionality is guided by CGenericClass and you use it just as it is a
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CGenericClass object.
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(2) Use its static function in the following ways:
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(a) if you have a transaction id (in the form of a string), you can
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spawn a WMI instance of Sce_TransactionToken by calling SpawnTokenInstance
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(b) Call BeginTransaction to begin a transaction if that store (parameter)
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has a transaction id instance (Sce_TransactionID), then it will start
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a transaction. When you are done, call EndTransaction.
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*/
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class CTranxID : public CGenericClass
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{
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public:
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CTranxID(
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ISceKeyChain *pKeyChain,
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IWbemServices *pNamespace,
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IWbemContext *pCtx
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);
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virtual ~CTranxID();
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public:
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//
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// The following four virtual functions are all mandatory to implement to become a concrete class
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//
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virtual HRESULT PutInst(
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IWbemClassObject *pInst,
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IWbemObjectSink *pHandler,
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IWbemContext *pCtx
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);
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virtual HRESULT CreateObject(
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IWbemObjectSink *pHandler,
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ACTIONTYPE atAction
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);
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//
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// we have nothing to clean up
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//
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virtual void CleanUp(){}
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static HRESULT BeginTransaction(
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LPCWSTR pszStorePath
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);
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static HRESULT EndTransaction();
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static HRESULT SpawnTokenInstance(
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IWbemServices* pNamespace,
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LPCWSTR pszTranxID,
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IWbemContext *pCtx,
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IWbemObjectSink* pSink
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);
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};
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