methodcontext.h

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#pragma option push -b -a8 -pc -A- /*P_O_Push*/
//
// MethodContext.h -- declaration of MethodContext class
//
// Copyright 1998 - 1999 Microsoft Corporation
//
//
//=================================================================

#if _MSC_VER > 1000
#pragma once
#endif

#ifndef _METHOD_CONTEXT_H__
#define _METHOD_CONTEXT_H__

#include "ThreadBase.h"
#include "refptrcollection.h"
#ifdef PROVIDER_INSTRUMENTATION
#include "StopWatch.h"
#endif

class CInstance;
class Provider;
class MethodContext;

typedef HRESULT (WINAPI * LPProviderInstanceCallback)(Provider* pProvider, CInstance* pInstance, MethodContext* pContext, void* pUserData);

//////////////////////////////////////////////////////
//
//  STRUCT MethodContext
//
// a little something to make sure we can keep our threads from getting tangled
// idea is that there is one MethodContext for each request from CIMOM or another provider
// pointers are passed around.
//////////////////////////////////////////////////////
class POLARITY MethodContext : public CThreadBase
{
public:
    MethodContext(IWbemContext   __RPC_FAR*  piContext);
    ~MethodContext();
    
    virtual HRESULT Commit(CInstance *pInstance) = 0;
    virtual IWbemContext __RPC_FAR* GetIWBEMContext();
    
    ULONG AddRef(void);
    ULONG Release(void);
    virtual void QueryPostProcess(void);
        
    bool SetStatusObject(IWbemClassObject* pObj);
    IWbemClassObject __RPC_FAR* GetStatusObject();

#ifdef PROVIDER_INSTRUMENTATION
    StopWatch* pStopWatch;
#endif
    
private:
    IWbemContext   __RPC_FAR*  m_pContext;
    IWbemClassObject    __RPC_FAR*  m_pStatusObject;
};

// for queries and suchlike that originate in CIMOM
class ExternalMethodContext  : public MethodContext
{
public:
    ExternalMethodContext(IWbemObjectSink __RPC_FAR* pResponseHandler,
                          IWbemContext    __RPC_FAR* pContext,
                          void*                      pReserved = NULL
                          );
    
    HRESULT Commit(CInstance *pInstance);
    virtual void QueryPostProcess(void);
    
    ULONG AddRef(void);
    ULONG Release(void);
    
private:
    IWbemObjectSink __RPC_FAR* m_pResponseHandler;
    void *                     m_pReserved;
};

// for queries and suchlike that come from within.
// contains a list of objects returned. 
class InternalMethodContext : public MethodContext
{
public:
    InternalMethodContext(TRefPointerCollection<CInstance>* pList ,
                          IWbemContext    __RPC_FAR* pContext);
    ~InternalMethodContext();
    
    HRESULT Commit(CInstance *pInstance);
    
    ULONG AddRef(void);
    ULONG Release(void);
    
private:
    TRefPointerCollection<CInstance>* m_pInstances;
};

// for queries and suchlike that come from within.
// "Asynch" is a bit of a misnomer - but it does help support
// asynchronous calls, in that each instance committed is routed
// to a callback function supplied by the requester
class InternalMethodContextAsynch : public MethodContext
{
public:
    InternalMethodContextAsynch(Provider* pThat,
                                LPProviderInstanceCallback pCallback,
                                IWbemContext __RPC_FAR* pContext,
                                MethodContext* pUsersContext,
                                void* pUserData);
    ~InternalMethodContextAsynch();
    
    HRESULT Commit(CInstance *pInstance);
    
    ULONG AddRef(void);
    ULONG Release(void);
    
private:
    Provider* m_pThat;
    LPProviderInstanceCallback m_pCallback;
    void* m_pUserData;
    MethodContext* m_pUsersContext;
};

#endif
#pragma option pop /*P_O_Pop*/