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913 lines
30 KiB
913 lines
30 KiB
//----------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1994 - 2000
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//
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// File: rownotfy.cxx
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//
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// Contents: Rowset notification connection points
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//
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// Classes: CRowsetNotification
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// CRowsetAsynchNotification
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//
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// History: 16 Feb 1998 AlanW Created from conpt.cxx
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//
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//----------------------------------------------------------------------------
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#include "pch.cxx"
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#pragma hdrstop
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#include <rownotfy.hxx>
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#include <query.hxx>
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#include "tabledbg.hxx"
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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//////////////// CRowsetAsynchNotification methods ///////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::CRowsetAsynchNotification, public
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//
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// Synopsis: Constructor for connection point container class.
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//
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// Arguments: [query] -- query object with notify info
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// [pRowset] -- Rowset pointer
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// [ErrorObject] -- OLE-DB error object
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// [fWatch] -- TRUE if watch notification to be done
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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CRowsetAsynchNotification::CRowsetAsynchNotification(
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PQuery & query,
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ULONG hCursor,
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IRowset * pRowset,
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CCIOleDBError & ErrorObject,
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BOOL fWatch)
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: _query(query),
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_hCursor(hCursor),
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CRowsetNotification( ),
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_AsynchConnectionPoint ( IID_IDBAsynchNotify ),
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_WatchConnectionPoint ( IID_IRowsetWatchNotify ),
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_fDoWatch (fWatch),
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_fPopulationComplete (FALSE),
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_cAdvise( 0 ),
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_pRowset(pRowset),
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_threadNotify(0),
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_threadNotifyId( 0 )
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{
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_AsynchConnectionPoint.SetContrUnk( (IUnknown *)this );
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if (_fDoWatch)
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{
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_WatchConnectionPoint.SetContrUnk( (IUnknown *)this );
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}
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} //CRowsetAsynchNotification
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::~CRowsetAsynchNotification, public
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//
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// Synopsis: Destructor for rowset watch notification class
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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CRowsetAsynchNotification::~CRowsetAsynchNotification()
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{
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Win4Assert( _cRefs == 0 && _pContainer == 0 );
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Win4Assert( _cAdvise == 0 );
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if ( 0 != _pContainer )
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StopNotifications();
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} //~CRowsetAsynchNotification
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::AddRef, public
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//
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// Synopsis: Increments aggregated object ref. count.
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//
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// Returns: ULONG
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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STDMETHODIMP_(ULONG) CRowsetAsynchNotification::AddRef()
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{
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return InterlockedIncrement( (long *) &_cRefs );
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} //AddRef
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::Release, public
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//
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// Synopsis: Decrements aggregated obj. ref. count, deletes on final release.
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//
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// Returns: ULONG
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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STDMETHODIMP_(ULONG) CRowsetAsynchNotification::Release()
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{
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long cRefs = InterlockedDecrement((long *) &_cRefs);
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tbDebugOut(( DEB_NOTIFY, "conpt: release, new crefs: %lx\n", _cRefs ));
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// If no references, make sure container doesn't know about me anymore
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if ( 0 == cRefs )
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{
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Win4Assert( 0 == _pContainer );
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if ( 0 != _pContainer )
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{
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// must have gotten here through excess client release
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StopNotifications();
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}
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delete this;
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}
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return cRefs;
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} //Release
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::StopNotifications
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//
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// Synopsis: Shuts down the notification thread (if any)
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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void CRowsetAsynchNotification::StopNotifications()
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{
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if ( GetCurrentThreadId() == _threadNotifyId )
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{
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Win4Assert( !"Notification thread used illegally" );
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return;
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}
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_EndNotifyThread();
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Disconnect();
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_AsynchConnectionPoint.Disconnect( );
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if (_fDoWatch)
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_WatchConnectionPoint.Disconnect( );
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::_EndNotifyThread
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//
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// Synopsis: Shuts down the notification thread (if any)
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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void CRowsetAsynchNotification::_EndNotifyThread()
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{
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//
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// Is there a thread out there to close?
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//
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if (0 != _threadNotify)
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{
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// Signal the thread to die and wait for it to do so, or just kill
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// the thread if it looks like it might be lost in client code.
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tbDebugOut(( DEB_NOTIFY,
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"set notify thread die event %lx\n",
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_evtEndNotifyThread.GetHandle() ));
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_evtEndNotifyThread.Set();
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DWORD dw = WaitForSingleObject( _threadNotify, INFINITE );
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BOOL fCloseWorked = CloseHandle( _threadNotify );
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Win4Assert( fCloseWorked && "CloseHandle of notify thread failed" );
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_threadNotify = 0;
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tbDebugOut(( DEB_NOTIFY, "notify thread is history \n"));
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}
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} //_EndNotifyThread
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::_StartNotifyThread
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//
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// Synopsis: Starts the notification thread
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//
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// History: 17 Mar 1998 AlanW
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//
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//--------------------------------------------------------------------------
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inline void CRowsetAsynchNotification::_StartNotifyThread()
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{
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tbDebugOut(( DEB_NOTIFY, "starting rowset notify thread\n" ));
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// First advise, create the thread
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Win4Assert(0 == _threadNotify);
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_threadNotify = CreateThread( 0, 65536,
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(LPTHREAD_START_ROUTINE) _NotifyThread,
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this, 0, & _threadNotifyId );
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if (0 == _threadNotify)
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THROW( CException() );
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::_NotifyThread, private
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//
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// Synopsis: Entry point for notification thread
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//
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// Arguments: [self] -- a container to call to do the work
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//
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// Returns: Thread exit code
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//
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// Notes: this function is "static"
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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DWORD CRowsetAsynchNotification::_NotifyThread(
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CRowsetAsynchNotification *self)
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{
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TRANSLATE_EXCEPTIONS;
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DWORD dw = self->_DoNotifications();
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UNTRANSLATE_EXCEPTIONS;
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return dw;
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} //_NotifyThread
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::_DoNotifications, private
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//
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// Synopsis: Collects notifications and passes them out to clients.
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// Loops sending notifications until event to end thread
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// arrives.
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//
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// Returns: Thread exit code
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//
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// History: 07-Oct-1994 dlee
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//
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//--------------------------------------------------------------------------
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DWORD CRowsetAsynchNotification::_DoNotifications()
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{
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BOOL fContinue = TRUE;
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do
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{
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TRY
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{
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if (fContinue && _AsynchConnectionPoint.GetAdviseCount() )
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fContinue = _DoAsynchNotification();
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if (fContinue && _fDoWatch &&
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_WatchConnectionPoint.GetAdviseCount() )
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fContinue = _DoWatchNotification();
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if (_fPopulationComplete && !_fDoWatch)
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fContinue = FALSE;
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}
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CATCH( CException, e )
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{
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// don't want to 'break' out of a catch block, use variable
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fContinue = FALSE;
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}
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END_CATCH;
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// Sleep for a bit, but wake up if the thread is to go away,
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ULONG x = _evtEndNotifyThread.Wait( defNotificationSleepDuration,
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FALSE );
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if ( STATUS_WAIT_0 == x )
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fContinue = FALSE;
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} while ( fContinue );
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return 0;
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} //_DoNotifications
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//+-------------------------------------------------------------------------
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//
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// Function: IsLowResources
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//
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// Synopsis: Returns TRUE if it looks like the error is resource related.
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//
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// Returns: BOOL - TRUE if low on resources
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//
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// History: 9 May 1999 dlee
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//
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//--------------------------------------------------------------------------
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BOOL IsLowResources( SCODE sc )
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{
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return E_OUTOFMEMORY == sc ||
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STATUS_NO_MEMORY == sc ||
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STATUS_COMMITMENT_LIMIT == sc ||
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STATUS_INSUFFICIENT_RESOURCES == sc ||
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HRESULT_FROM_WIN32( ERROR_COMMITMENT_LIMIT ) == sc ||
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HRESULT_FROM_WIN32( ERROR_NO_SYSTEM_RESOURCES ) == sc ||
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STG_E_INSUFFICIENTMEMORY == sc;
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} //IsLowResources
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//+-------------------------------------------------------------------------
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//
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// Method: CRowsetAsynchNotification::_DoAsynchNotification, private
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//
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// Synopsis: Collects asynch notifications and passes them out to clients.
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// Tracks whether rowset population is completed, after which
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// no more notifications are given (except for completion
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// notifications for new advises).
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//
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// Returns: BOOL - TRUE if notification thread should continue
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//
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// History: 18 Mar 1998 AlanW
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//
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//--------------------------------------------------------------------------
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inline DWORD MapAsynchPhaseAndOp( ULONG op, ULONG phase )
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{
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Win4Assert( op == 0 && phase < 4 );
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return (((op+1) << 4) | (1 << phase));
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}
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#define ASYNC_PHASE_MASK 0x0F
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#define ASYNC_OP_MASK 0xF0
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BOOL CRowsetAsynchNotification::_DoAsynchNotification()
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{
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DBCOUNTITEM ulDenominator = 0, ulNumerator = 0;
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DBCOUNTITEM cRows = 0;
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BOOL fNewRows = FALSE;
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SCODE sc = S_OK;
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TRY
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{
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CNotificationSync Sync( _evtEndNotifyThread.GetHandle() );
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sc = _query.RatioFinished( Sync,
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_hCursor,
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ulDenominator,
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ulNumerator,
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cRows,
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fNewRows );
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// Did the main thread tell this thread to go away?
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if ( SUCCEEDED( sc ) )
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{
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Win4Assert( ulDenominator > 0 && ulNumerator <= ulDenominator );
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if (fNewRows)
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OnRowChange( _pRowset, 0, 0, DBREASON_ROW_ASYNCHINSERT,
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DBEVENTPHASE_DIDEVENT, TRUE );
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if (!_fPopulationComplete && (ulNumerator == ulDenominator))
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{
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OnRowsetChange( _pRowset, DBREASON_ROWSET_POPULATIONCOMPLETE,
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DBEVENTPHASE_DIDEVENT, TRUE );
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_fPopulationComplete = TRUE;
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}
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}
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}
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CATCH( CException, e )
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{
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sc = e.GetErrorCode();
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}
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END_CATCH;
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if ( STATUS_CANCELLED == sc )
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return FALSE;
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BOOL fLowResources = IsLowResources( sc );
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if ( !fLowResources && !SUCCEEDED( sc ) )
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return FALSE;
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// Give notice to all active advises.
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// Need to be careful here to avoid deadlock. The enumerator
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// grabs the CPC's mutex. This limits what the client can do.
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ULONG ulAsynchPhase = DBASYNCHPHASE_POPULATION;
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if (_fPopulationComplete)
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ulAsynchPhase = DBASYNCHPHASE_COMPLETE;
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ULONG dwOpMask = MapAsynchPhaseAndOp( DBASYNCHOP_OPEN, ulAsynchPhase );
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CEnumConnectionsLite Enum( _AsynchConnectionPoint );
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CConnectionPointBase::CConnectionContext *pConnCtx = Enum.First();
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while ( 0 != pConnCtx )
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{
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IDBAsynchNotify *pNotifyAsynch = (IDBAsynchNotify *)(pConnCtx->_pIUnk);
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tbDebugOut(( DEB_NOTIFY, "rownotfy: pinging asynch client %x\n", pNotifyAsynch ));
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SCODE sc = S_OK;
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if ( fLowResources )
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{
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//
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// Let the client know we're really wedged and they might not
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// get more notifications consistently.
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//
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sc = pNotifyAsynch->OnLowResource( 0 );
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}
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else
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{
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if ( 0 == (pConnCtx->_dwSpare & dwOpMask) )
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{
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sc = pNotifyAsynch->OnProgress( DB_NULL_HCHAPTER,
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DBASYNCHOP_OPEN,
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ulNumerator, ulDenominator,
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ulAsynchPhase, 0);
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}
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BOOL fOnStop = FALSE;
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if ( _fPopulationComplete && S_OK == sc )
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{
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sc = DB_S_UNWANTEDPHASE;
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fOnStop = TRUE;
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}
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if (DB_S_UNWANTEDPHASE == sc)
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pConnCtx->_dwSpare |= (dwOpMask & ASYNC_PHASE_MASK);
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else if (DB_S_UNWANTEDOPERATION == sc)
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pConnCtx->_dwSpare |= (dwOpMask & ASYNC_OP_MASK);
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else if (E_NOTIMPL == sc)
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pConnCtx->_dwSpare |= (ASYNC_PHASE_MASK | ASYNC_OP_MASK);
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if ( fOnStop )
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pNotifyAsynch->OnStop( DB_NULL_HCHAPTER,
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DBASYNCHOP_OPEN,
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S_OK,
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0 );
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}
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tbDebugOut(( DEB_NOTIFY, "rownotfy:(end) pinging asynch client\n" ));
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pConnCtx = Enum.Next();
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}
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// Keep trying to get notifications even if fLowResources is TRUE
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return TRUE;
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} //_DoAsynchNotification
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|
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//+-------------------------------------------------------------------------
|
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//
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// Method: CRowsetAsynchNotification::_DoWatchNotification, private
|
|
//
|
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// Synopsis: Collects watch notifications and passes them out to clients.
|
|
//
|
|
// Returns: BOOL - TRUE if notification thread should continue
|
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//
|
|
// History: 18 Mar 1998 AlanW
|
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//
|
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//--------------------------------------------------------------------------
|
|
|
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BOOL CRowsetAsynchNotification::_DoWatchNotification()
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{
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// get notification information from the cursor
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CNotificationSync Sync( _evtEndNotifyThread.GetHandle() );
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DBWATCHNOTIFY changeType;
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|
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SCODE sc = _query.GetNotifications( Sync, changeType );
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|
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// Did the main thread tell this thread to go away?
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|
|
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if (STATUS_CANCELLED == sc)
|
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return FALSE;
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|
|
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if (!SUCCEEDED(sc))
|
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return FALSE;
|
|
|
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// got some, give them to all active advises
|
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// Need to be careful here to avoid deadlock. The enumerator
|
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// grabs the CPC's mutex. We need to break out of the loop
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// if the notify thread needs to go away...
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|
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tbDebugOut(( DEB_NOTIFY, "rownotfy: watch type %d\n", changeType ));
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CEnumConnectionsLite Enum( _WatchConnectionPoint );
|
|
CConnectionPointBase::CConnectionContext *pConnCtx = Enum.First();
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|
|
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while ( pConnCtx )
|
|
{
|
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IRowsetWatchNotify *pNotifyWatch =
|
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(IRowsetWatchNotify *)(pConnCtx->_pIUnk);
|
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tbDebugOut(( DEB_NOTIFY, "rownotfy: pinging watch client %x\n", pNotifyWatch ));
|
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pNotifyWatch->OnChange( _pRowset, changeType);
|
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tbDebugOut(( DEB_NOTIFY, "rownotfy:(end) pinging watch client\n" ));
|
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pConnCtx = Enum.Next();
|
|
}
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|
|
return TRUE;
|
|
} //_DoWatchNotification
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Method: CRowsetAsynchNotification::AdviseHelper, private static
|
|
//
|
|
// Synopsis: Starts the notification thread if this is the first advise.
|
|
//
|
|
// Arguments: [pHelperContext] - "this" pointer
|
|
// [pConnPt] - the connection point, either Async or Watch CP
|
|
// [pConnCtx] - pointer to connection context
|
|
//
|
|
// Notes: CPC critical section is assumed to be held.
|
|
//
|
|
// History: 17 Mar 1998 AlanW
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
void CRowsetAsynchNotification::AdviseHelper( PVOID pHelperContext,
|
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CConnectionPointBase * pConnPt,
|
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CConnectionContext * pConnCtx )
|
|
{
|
|
CRowsetAsynchNotification * pSelf =
|
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(CRowsetAsynchNotification *) pHelperContext;
|
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|
|
pSelf->_cAdvise++;
|
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if (1 == pSelf->_cAdvise)
|
|
{
|
|
// First advise, create the notification thread
|
|
pSelf->_StartNotifyThread();
|
|
Win4Assert(0 != pSelf->_threadNotify);
|
|
}
|
|
}
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Method: CRowsetAsynchNotification::UnadviseHelper, private static
|
|
//
|
|
// Synopsis: Stops the notification thread if this is the last active advise.
|
|
//
|
|
// Arguments: [pHelperContext] -- "this" pointer
|
|
// [pConnPt] -- the connection point, either Async or
|
|
// Watch CP
|
|
// [pConnCtx] -- pointer to connection context
|
|
// [lock] -- CPC lock
|
|
//
|
|
// Notes: CPC critical section is assumed to be held.
|
|
//
|
|
// History: 17 Mar 1998 AlanW
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
void CRowsetAsynchNotification::UnadviseHelper(
|
|
PVOID pHelperContext,
|
|
CConnectionPointBase * pConnPt,
|
|
CConnectionContext * pConnCtx,
|
|
CReleasableLock & lock )
|
|
{
|
|
CRowsetAsynchNotification * pSelf =
|
|
(CRowsetAsynchNotification *) pHelperContext;
|
|
|
|
Win4Assert( pSelf->_cAdvise > 0 );
|
|
if ( --pSelf->_cAdvise == 0 )
|
|
{
|
|
// Release the lock so the notify thread has a change to end
|
|
// when we tell it to end.
|
|
|
|
lock.Release();
|
|
|
|
pSelf->_EndNotifyThread();
|
|
}
|
|
}
|
|
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Function: MapPhaseAndReason, inline local
|
|
//
|
|
// Synopsis: Encode IRowsetNotify phase and reason into a bit mask
|
|
// for supported phases and reasons. Luckily, most supported
|
|
// reasons have only a single phase. Multi-phase reasons take
|
|
// 5 bits.
|
|
//
|
|
// Returns: DWORD - bit mask for the reason/phase combination
|
|
//
|
|
// History: 18 Mar 1998 AlanW
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
const maxSinglePhaseReasons = 8;
|
|
const maxMultiPhaseReasons = 4;
|
|
const maxPhases = 5;
|
|
const bitDidNotifyVote = 0x80000000;
|
|
|
|
inline DWORD MapPhaseAndReason( ULONG phase, ULONG reason )
|
|
{
|
|
Win4Assert( reason <= 21 && phase <= 4 );
|
|
|
|
BOOL fSinglePhase = TRUE;
|
|
DWORD dwMappedReason = 0;
|
|
|
|
switch (reason)
|
|
{
|
|
// single-phase reasons
|
|
case DBREASON_ROW_ASYNCHINSERT:
|
|
dwMappedReason = 0; break;
|
|
case DBREASON_ROWSET_RELEASE:
|
|
dwMappedReason = 1; break;
|
|
case DBREASON_ROW_ACTIVATE:
|
|
dwMappedReason = 2; break;
|
|
case DBREASON_ROW_RELEASE:
|
|
dwMappedReason = 3; break;
|
|
case DBREASON_ROWSET_POPULATIONCOMPLETE:
|
|
dwMappedReason = 4; break;
|
|
case DBREASON_ROWSET_POPULATIONSTOPPED:
|
|
dwMappedReason = 5; break;
|
|
|
|
// multi-phase reasons
|
|
case DBREASON_ROWSET_FETCHPOSITIONCHANGE:
|
|
dwMappedReason = 0; fSinglePhase = FALSE; break;
|
|
|
|
default:
|
|
tbDebugOut(( DEB_ERROR, "MapPhaseAndReason - reason: %d phase: %d\n",
|
|
reason, phase ));
|
|
Win4Assert( !"MapPhaseAndReason: unhandled reason" );
|
|
}
|
|
|
|
Win4Assert( FALSE == fSinglePhase || phase == DBEVENTPHASE_DIDEVENT );
|
|
if (fSinglePhase)
|
|
{
|
|
Win4Assert( dwMappedReason < maxSinglePhaseReasons );
|
|
dwMappedReason = (1 << dwMappedReason);
|
|
}
|
|
else
|
|
{
|
|
dwMappedReason = dwMappedReason*maxPhases + phase + maxSinglePhaseReasons;
|
|
Win4Assert( dwMappedReason <= 30 );
|
|
dwMappedReason = (1 << dwMappedReason);
|
|
}
|
|
|
|
return dwMappedReason;
|
|
}
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Function: MapAllPhases, inline local
|
|
//
|
|
// Synopsis: Return a bit mask that includes all bits for all supported
|
|
// phases of the encoded reason.
|
|
//
|
|
// Arguments: [dwMappedReasonAndPhase] - a bit mask returned by
|
|
// MapPhaseAndReason.
|
|
//
|
|
// Returns: DWORD - bit mask for all phases
|
|
//
|
|
// History: 18 Mar 1998 AlanW
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
inline DWORD MapAllPhases( DWORD dwMappedReasonAndPhase )
|
|
{
|
|
Win4Assert( dwMappedReasonAndPhase != 0 );
|
|
|
|
if (dwMappedReasonAndPhase < (1<<maxSinglePhaseReasons))
|
|
return dwMappedReasonAndPhase;
|
|
|
|
// dwMask == 0x00001F00
|
|
DWORD dwMask = (((1<<maxPhases)-1) << maxSinglePhaseReasons);
|
|
for (unsigned i=0; i<maxMultiPhaseReasons; i++)
|
|
{
|
|
if (dwMask & dwMappedReasonAndPhase)
|
|
return (dwMappedReasonAndPhase | dwMask);
|
|
|
|
dwMask = dwMask << maxPhases;
|
|
}
|
|
Win4Assert(! "MapAllPhases - fell out of loop!" );
|
|
return 0;
|
|
}
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Method: IRowsetNotify::OnXxxxChange
|
|
//
|
|
// Synopsis: Dispatches CRowsetNotification notifications to clients.
|
|
//
|
|
// Returns: SCODE
|
|
//
|
|
// History: 11 Mar 1998 AlanW
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
SCODE CRowsetNotification::OnFieldChange (
|
|
IRowset * pRowset,
|
|
HROW hRow,
|
|
DBORDINAL cColumns,
|
|
DBORDINAL rgColumns[],
|
|
DBREASON eReason,
|
|
DBEVENTPHASE ePhase,
|
|
BOOL fCantDeny )
|
|
{
|
|
SCODE sc = S_OK;
|
|
|
|
// NOTE: OnFieldChange is not generated by our rowsets. This code
|
|
// doesn't handle unwanted phases or reasons.
|
|
|
|
CEnumConnectionsLite Enum( *this );
|
|
CConnectionPointBase::CConnectionContext *pConnCtx = Enum.First();
|
|
|
|
while ( pConnCtx )
|
|
{
|
|
IRowsetNotify *pNotify = (IRowsetNotify *)(pConnCtx->_pIUnk);
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy: pinging notify client %x\n", pNotify ));
|
|
SCODE sc1 = pNotify->OnFieldChange( pRowset,
|
|
hRow,
|
|
cColumns,
|
|
rgColumns,
|
|
eReason,
|
|
ePhase,
|
|
fCantDeny );
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy:(end) pinging notify client\n" ));
|
|
pConnCtx = Enum.Next();
|
|
}
|
|
return sc;
|
|
}
|
|
|
|
SCODE CRowsetNotification::OnRowChange (
|
|
IRowset * pRowset,
|
|
DBCOUNTITEM cRows,
|
|
const HROW rghRows[],
|
|
DBREASON eReason,
|
|
DBEVENTPHASE ePhase,
|
|
BOOL fCantDeny )
|
|
{
|
|
// Note: we don't generate any row notifications which can be denied.
|
|
Win4Assert( fCantDeny && DBEVENTPHASE_DIDEVENT == ePhase );
|
|
|
|
DWORD dwMask = MapPhaseAndReason( ePhase, eReason );
|
|
CEnumConnectionsLite Enum( *this );
|
|
CConnectionPointBase::CConnectionContext *pConnCtx = Enum.First();
|
|
|
|
while ( pConnCtx )
|
|
{
|
|
if (0 == (pConnCtx->_dwSpare & dwMask))
|
|
{
|
|
IRowsetNotify *pNotify = (IRowsetNotify *)(pConnCtx->_pIUnk);
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy: pinging notify client %x\n", pNotify ));
|
|
SCODE sc1 = pNotify->OnRowChange( pRowset,
|
|
cRows,
|
|
rghRows,
|
|
eReason,
|
|
ePhase,
|
|
fCantDeny );
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy:(end) pinging notify client\n" ));
|
|
if (DB_S_UNWANTEDPHASE == sc1)
|
|
pConnCtx->_dwSpare |= dwMask;
|
|
else if (DB_S_UNWANTEDREASON == sc1)
|
|
pConnCtx->_dwSpare |= MapAllPhases(dwMask);
|
|
}
|
|
pConnCtx = Enum.Next();
|
|
}
|
|
return S_OK;
|
|
}
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Method: CRowsetNotification::DoRowsetChangeCallout, private
|
|
//
|
|
// Synopsis: Issues an OnRowsetChange notification to all active
|
|
// advises. If [fCantDeny] is FALSE, tracks which advises
|
|
// were successfully notified and checks the votes.
|
|
//
|
|
// Arguments: [Enum] - a connection context enumeration
|
|
// [pRowset] - the rowset issuing the notification
|
|
// [eReason] - the notification reason
|
|
// [ePhase] - the notification phase
|
|
// [fCantDeny] - if TRUE, notification can't be denied
|
|
//
|
|
// Notes: CPC critical section is assumed to be held.
|
|
//
|
|
// History: 08 Apr 1998 AlanW
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
BOOL CRowsetNotification::DoRowsetChangeCallout (
|
|
CEnumConnectionsLite & Enum,
|
|
IRowset * pRowset,
|
|
DBREASON eReason,
|
|
DBEVENTPHASE ePhase,
|
|
BOOL fCantDeny )
|
|
{
|
|
DWORD dwMask = MapPhaseAndReason( ePhase, eReason );
|
|
CConnectionPointBase::CConnectionContext *pConnCtx;
|
|
BOOL fVeto = FALSE;
|
|
|
|
for ( pConnCtx = Enum.First(); pConnCtx; pConnCtx = Enum.Next() )
|
|
{
|
|
if ( 0 == (pConnCtx->_dwSpare & dwMask) )
|
|
{
|
|
IRowsetNotify *pNotify = (IRowsetNotify *)(pConnCtx->_pIUnk);
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy: pinging notify client %x\n", pNotify ));
|
|
SCODE sc1 = pNotify->OnRowsetChange( pRowset,
|
|
eReason,
|
|
ePhase,
|
|
fCantDeny );
|
|
|
|
if ( !fCantDeny )
|
|
{
|
|
if (S_FALSE == sc1)
|
|
{
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy: notify client veto'ed\n" ));
|
|
fVeto = TRUE;
|
|
break;
|
|
}
|
|
pConnCtx->_dwSpare |= bitDidNotifyVote;
|
|
}
|
|
if (DB_S_UNWANTEDPHASE == sc1)
|
|
pConnCtx->_dwSpare |= dwMask;
|
|
else if (DB_S_UNWANTEDREASON == sc1)
|
|
pConnCtx->_dwSpare |= MapAllPhases(dwMask);
|
|
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy:(end) pinging notify client\n" ));
|
|
}
|
|
}
|
|
return fVeto;
|
|
}
|
|
|
|
|
|
SCODE CRowsetNotification::OnRowsetChange (
|
|
IRowset * pRowset,
|
|
DBREASON eReason,
|
|
DBEVENTPHASE ePhase,
|
|
BOOL fCantDeny )
|
|
{
|
|
// Note: we don't use SYNCHAFTER, and ABOUTTODO is done here after voting
|
|
Win4Assert( DBEVENTPHASE_ABOUTTODO != ePhase &&
|
|
DBEVENTPHASE_SYNCHAFTER != ePhase );
|
|
|
|
BOOL fVeto = FALSE;
|
|
CEnumConnectionsLite Enum( *this );
|
|
|
|
if ( DBEVENTPHASE_OKTODO == ePhase )
|
|
{
|
|
Win4Assert( !fCantDeny );
|
|
|
|
fVeto = DoRowsetChangeCallout( Enum, pRowset, eReason,
|
|
DBEVENTPHASE_OKTODO, FALSE );
|
|
if ( ! fVeto )
|
|
fVeto = DoRowsetChangeCallout( Enum, pRowset, eReason,
|
|
DBEVENTPHASE_ABOUTTODO, FALSE );
|
|
|
|
DWORD dwMask = MapPhaseAndReason( DBEVENTPHASE_FAILEDTODO, eReason );
|
|
CConnectionPointBase::CConnectionContext *pConnCtx;
|
|
|
|
for ( pConnCtx = Enum.First(); pConnCtx; pConnCtx = Enum.Next() )
|
|
{
|
|
if (fVeto &&
|
|
0 == (pConnCtx->_dwSpare & dwMask) &&
|
|
0 != (pConnCtx->_dwSpare & bitDidNotifyVote) )
|
|
{
|
|
IRowsetNotify *pNotify = (IRowsetNotify *)(pConnCtx->_pIUnk);
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy: pinging notify client %x for FAIL\n", pNotify ));
|
|
SCODE sc1 = pNotify->OnRowsetChange( pRowset,
|
|
eReason,
|
|
DBEVENTPHASE_FAILEDTODO,
|
|
TRUE );
|
|
tbDebugOut(( DEB_NOTIFY, "rownotfy:(end) pinging notify client for FAIL\n" ));
|
|
|
|
if (DB_S_UNWANTEDPHASE == sc1)
|
|
pConnCtx->_dwSpare |= dwMask;
|
|
else if (DB_S_UNWANTEDREASON == sc1)
|
|
pConnCtx->_dwSpare |= MapAllPhases(dwMask);
|
|
}
|
|
pConnCtx->_dwSpare &= ~bitDidNotifyVote;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// a non-vetoable notification; just send the notifies
|
|
Win4Assert( fCantDeny );
|
|
DoRowsetChangeCallout( Enum, pRowset, eReason, ePhase, TRUE );
|
|
}
|
|
return fVeto ? S_FALSE : S_OK;
|
|
}
|