DCOM(Distributed COM)

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DCOM(Distributed COM)

• Presenter
• ???? R89725009 ???
• ???? R89725037 ???

2
??

• Component Object Model
• Distributed COM
• DCOM Example With MFC
• SAP
• DCOM Component Connector

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Component Object Model

• COM ???????????????
• COM?????
• ??COM?????????????
• COM?????
• COM??????????????API
• ?????????????
• ?????
• ???? (in-process server)
• ???? (out-of-process server, local server)
• ???? (remote server)

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COM ?????

• ???? Componentware
• COM ???
• ????????????????
• ?????
• ?????

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COM??

• ???????????????????
• ??COM??????????
• ??????IID(Interface ID)
• ???IUnknown??
• ??????,??????
• ?????????
• ????????

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IUnknown??

• QueryInterface
• ??????????????
• AddRef?Release
• ???????????,?????(Reference Count)???0?,???????
  ????????????,????????,

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COM?????

• ???????????????????
• ??????????????,????
• ???????
• -???(In Process)
• -??(Local)
• -?? (Remote)

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???(In-Process)

• ?????????????????,?????????

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???(In-Process)

• In-Process ServerDLL??
• ???,?DLL???????
• ??????
• ??????Process,??????

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??(Local)

• ??????????????????,????????????????

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??(Local)

• ????? EXE ??
• ????,????????
• Proxy-gt Marshaling-gtIPC (inter-process
  communication)-gtUn-marshaling-gtStub
• ????? In-Process Server ?

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??(Remote)

• ??????????????,????????

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??(Remote)

• Client?? Server ?????????proxy/stub ?? marshaling
• RPC(Remote Procedure Call) ??
• Server??? DLL ??? EXE ??
• (?? DLL,??? Server ?????,
• ??? dllhost.exe)

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COM?????(COM Library)

• COM????????COM?????
• ??COM????????????????DLL??,??DLL????COM????????
  ??
• -???API??
• -??????
• -??????????
• -????????

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??????(Interface Definition Language)

• ???????????
• MIDL(Microsoft IDL???)
• Proxy/Stub DLL
• Proxy?stub??????proxy/stub DLL?,??DLL?????proxy
  ????stub???? ???????????????????,????proxy/stub
  DLL????????????? ?

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COM?????????

• ??(containment)

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COM?????????

• ??(aggregation)

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??Visual Basic?? Excel
Dim obj Set obj CreateObject(Excel.Application
) obj.visible true obj.Workbooks.Add obj.Range(
"B3").Select obj.ActiveCell.FormulaR1C1
"12" obj.Range("B4").Select obj.ActiveCell.Formula
R1C1 "34
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COM ???? Excel ????

• ?? RegEdit.exe ?????
• HKEY_CLASSES_ROOT CLSID 00024500-0000-000
  LocalServer32 excel.exe
• Excel.Application CLSID
  00024500-0000-000
• Excel.Application ProgID

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COM Runtime
???????
COM Runtime
????(Monikers, Storage, Data Transfer,...)
DCOM
Registry
Pluggable Security(SSPI)
MS-RPC
NTLM
Pluggable Transports
DCE
Kerberos
ETC...
TCP
UDP
IPX
Tunneled TCP
ETC...
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Core COM Services

• Security
• Lifecycle Management
• Type Information (Interface Repository)
• Monikers (Naming)
• Automation (Dynamic Invocation)

• Data Transfer
• Component Categories
• Registry

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COM Runtime ArchitectureFlexible and extensible
Pluggable Transports
Server Machine
Client Machine
TCP, UDP
COMClient
SPX,IPX
COM Runtime
COM Runtime
Net BUI
HTTP
Falcon
Other Component
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COM Runtime ArchitectureFlexible and extensible
Pluggable Security Providers
Server Machine
Client Machine
NTLM
COMClient
SSL, Certs.
COM Runtime
COM Runtime
NT Kerberos
DCE
Other Component
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COM ??????
?????
?????
OLE32.DLL
Service Control manager (RPCSS.EXE)
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COM ??????
?????
?????
OLE32.DLL
Service Control manager (RPCSS.EXE)
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COM ??????
????
?????
?????
OLE32.DLL
OLE32.DLL
Service Control manager (RPCSS.EXE)
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COM ??????
????
?????
?????
OLE32.DLL
OLE32.DLL
Service Control manager (RPCSS.EXE)
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COM ??????
????
?????
?????
COM ?????
OLE32.DLL
OLE32.DLL
Service Control manager (RPCSS.EXE)
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Distributed COM

• Just COM with a longer wire
• All COM components communicate in the same way
• on the same machine
• In-process, Out-of-process
• across a Local Area Network
• across a Wide Area Network
• across the Internet
• Same tools, knowledge, code

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Distributed COM

• Wire Protocol
• Based on DCE RPC Specification
• Interoperable with OSF DCE RPC implementations
• We call it ORPC
• ???????????
• CreateObject(ProgID, Jacky)
• DCOMCNFG.EXE

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COM???????????????

• ?? RegEdit.exe!
• HKEY_CLASSES_ROOT
• AppID
• 00024500-0000-000
• RemoteServerName jacky

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DCOM ?????
????
?????
?????
OLE32.DLL
OLE32.DLL
SCM
SCM
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COM???????

• ????
• ???????????????
• (registry)???
• ??????????????????
• ???????
• ????(default security)???????????????????
• ????(component security)????????????????

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To implement a class using MFCs interface maps
follows these steps
Implementation With MFC(1)

• 1.Use Derive a class either directly or
  indirectly from
• CCmdTarget.
•   2.Use the DECLARE_INTERFACE_MAP function
  in
• the derived class definition.
• 3.For each interface you wish to support,
  use the
• BEGIN_INTERFACE_PART?
• END_INTERFACE_PART
• macros in the class definition.

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Implementation With MFC(2)
4.In the implementation file, use the
BEGIN_INTERFACE_MAP and END_INTERFACE_MAP
macros to define the class's interface
map. 5.For each IID supported, use the
INTERFACE_PART macro between the
BEGIN_INTERFACE_MAP and END_INTERFACE_MAP
macros to map that IID to a specific "part"
of your class.
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Implementation With MFC(3)
6.Implement each of the nested classes that
represent the interfaces you support.
7.Use the METHOD_PROLOGUE macro to access the
parent, CcmdTarget-derived object.
8.AddRef, Release, and QueryInterface can
delegate to the CcmdTarget implementation
of these functions ExternalAddRef,
ExternalRelease, and ExternalQueryInterfac
e.
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Macro of MFC Implementation(1)

• BEGIN_INTERFACE_PART(localClass, iface)
• END_INTERFACE_PART(localClass)
• localClass?? interface ? class
• ifaceclass ??? interface
• ????????,???X??????????,????????

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Macro of MFC Implementation(2)

• DECLARE_INTERFACE_MAP
• ?????????,????????????????
• BEGIN_INTERFACE_MAP(theClass, baseClass)
• END_INTERFACE_MAP
• theClass ??? interface ? class
• baseClass? class??????
• ?implement?,???? interface map?

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Macro of MFC Implementation(3)

• STDMETHOD_
• ?????(.h file)?,??method?
• STDMETHODIMP_
• ?implement?(.cpp),??method?
• ?????????????????

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Macro of MFC Implementation(4)

• STDMETHOD
• ?????(.h file)?,??method?
• STDMETHODIMP
• ?implement?(.cpp),??method?
• ?????????HRESULT?????
• METHOD_PROLOGUE
• ????????,???pThis??????

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CLASS FACTORY(1)

• A COM object that implements the IClassFactory
  interface and that creates one or more instances
  of an object?

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CLASS FACTORY(2)

• IClassFactory??
• ???IUnknow??,??member function
• ?
• virtual BOOL CreateInstance(int nlid,
• void ppvObj)
• 0

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CLASS FACTORY(3)

• Why Class Factory ?
• ??????call target class?constructor,?object??????
  ???Class Factory
• ???

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???? Interface.h

• struct Isum public IUnknown
• STDMETHOD_(void, Sum) (int x,int y,
• int revtal) 0

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?CcmdTarget??derived??? ???? test.h

• class CTest public CCmdTarget
• ???
• protected
• ???
• BEGIN_INTERFACE_PART(Sum, ISum)
• STDMETHOD_(void, Sum) (int x,int y,int
  revtal)
• END_INTERFACE_PART(Sum)
• DECLARE_INTERFACE_MAP()

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??implement test.cpp(1)

• include "Interface.h"
• include "test.h
• ???
• static const IID IID_ISum
• 0x692d03a4, 0xc689, 0x11ce,
• 0xb3, 0x37, 0x88, 0xea, 0x36, 0xde, 0x9e,
  0x4e
• BEGIN_INTERFACE_MAP(CTest, CCmdTarget)
• INTERFACE_PART(CTest, IID_ISum, Sum)
• END_INTERFACE_MAP()

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??implement test.cpp(2)

• STDMETHODIMP_(ULONG) CTestXSumAddRef()
• METHOD_PROLOGUE(CTest, Sum)
• return pThis-gtExternalAddRef()
• STDMETHODIMP_(ULONG) CTestXSumRelease()
• METHOD_PROLOGUE(CTest, Sum)
• return pThis-gtExternalRelease()

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??implement test.cpp(3)

• STDMETHODIMP CTestXSumQueryInterface(
• REFIID iid, LPVOID ppvObj)
• METHOD_PROLOGUE(CTest, Sum)
• return pThis-gtExternalQueryInterface(iid,
  ppvObj)
•  STDMETHODIMP_(void) CTestXSumSum(int x,int
  y,int revtal)
• revtalxy
• return

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?????(1)

• LPCLASSFACTORY pClf
• LPUNKNOWN pUnk
• ISum pSum
• Imultilpy pMul
• HRESULT hr
• CLSID clsid
•  
• if ((hr CLSIDFromProgID(L"Test", clsid))
  ! NOERROR)
• return

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?????(2)

• if((hrCoGetClassObject(clsid,CLSCTX_REMOTE_SERV
  ER, NULL, IID_IClassFactory, (void ) pClf)) !
  NOERROR)
• return
•  
• pClf-gtCreateInstance(NULL, IID_IUnknown, (void)
  pUnk)
• pUnk-gtQueryInterface(IID_ISum, (void) pSum)

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?????(3)

• int sum
• pSum-gtSum(4,5,sum)
•  
• pClf-gtRelease()
• pUnk-gtRelease()
• pSum-gtRelease()

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• DCOM Component Connector
• ?SAP?Microsoft????DCOM???????,????SAP?????
  ????components?????????????????????,?????????????
  ?(component),?????????????

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• ??DCOM Component Connector???(1)
• A new dimension of openness
• ??????? interface ?????????
• Leverage existing programming skills
• ?????????SAP tools?COM tools???
• ??

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• ??DCOM Component Connector???(1)
• Eased integration
• ?????DCOM,????????????
• ???????????DataBases
• Evolutionary approach
• ??????scalability,??????????
• ???????

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• ????
• SAP??DCOM Component Connector ???Business
  Framework,????component-based?integrated?open
  application software solution????SAP???collaborati
  ve e-business??mySAP.com ???Business
  Framework????????

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• Thank you!