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165 lines
3.7 KiB
165 lines
3.7 KiB
/*++
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Copyright (C) 1996-2001 Microsoft Corporation
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Module Name:
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Abstract:
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History:
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--*/
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#include "precomp.h"
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#include <assert.h>
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#include "multsend.h"
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/*****************************************************************
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CMsgMultiSendReceive - Implements the list of senders using a circular
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list. This allows us to easily advance the current sender when
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encountering failures. MultiSendReceive remembers the last good sender.
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It will keep using this until it has a problem with it.
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******************************************************************/
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CMsgMultiSendReceive::~CMsgMultiSendReceive()
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{
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if ( m_pTail == NULL )
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{
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return;
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}
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SenderNode* pCurr = m_pTail->m_pNext;
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while( pCurr != m_pTail )
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{
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SenderNode* pTmp = pCurr->m_pNext;
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delete pCurr;
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pCurr = pTmp;
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}
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delete m_pTail;
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}
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//
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// Later, we could support flags that tell us where to add the sender.
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// for now, we always add to the end of the list.
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//
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HRESULT CMsgMultiSendReceive::Add( DWORD dwFlags,
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IWmiMessageSendReceive* pSndRcv)
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{
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ENTER_API_CALL
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HRESULT hr;
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SenderNode* pNew = new SenderNode;
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if ( pNew == NULL )
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{
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return WBEM_E_OUT_OF_MEMORY;
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}
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pNew->m_pVal = pSndRcv;
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CInCritSec ics(&m_cs);
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if ( m_pTail != NULL )
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{
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pNew->m_pNext = m_pTail->m_pNext;
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m_pTail->m_pNext = pNew;
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}
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else
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{
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m_pPrimary = pNew;
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pNew->m_pNext = pNew;
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}
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//
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// if the sender is also a multi sender, we handle things differently
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// in the send logic.
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//
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if ( dwFlags & WMIMSG_FLAG_MULTISEND_TERMINATING_SENDER )
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{
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pNew->m_bTermSender = TRUE;
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}
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else
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{
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pNew->m_bTermSender = FALSE;
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}
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m_pTail = pNew;
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return S_OK;
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EXIT_API_CALL
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}
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//
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// returns S_FALSE when succeeded but primary is not used.
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//
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HRESULT CMsgMultiSendReceive::SendReceive( PBYTE pData,
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ULONG cData,
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PBYTE pAuxData,
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ULONG cAuxData,
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DWORD dwFlags,
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IUnknown* pCtx )
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{
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ENTER_API_CALL
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HRESULT hr;
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CInCritSec ics( &m_cs );
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if ( m_pTail == NULL )
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{
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return S_OK;
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}
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HRESULT hrReturn = S_OK;
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SenderNode* pCurr = m_pTail;
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SenderNode* pTerm = m_pTail;
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do
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{
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pCurr = pCurr->m_pNext;
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hr = pCurr->m_pVal->SendReceive( pData,
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cData,
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pAuxData,
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cAuxData,
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dwFlags,
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pCtx );
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//
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// on error we only observe the 'return immediately' flag if we are not
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// calling another multi sender. This allows all the terminal primary
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// senders to be tried first, before resorting to alternates.
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//
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if( SUCCEEDED(hr) ||
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pCurr->m_bTermSender &&
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dwFlags & WMIMSG_FLAG_MULTISEND_RETURN_IMMEDIATELY )
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{
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hrReturn = hr;
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break;
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}
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else
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{
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m_pTail = m_pTail->m_pNext;
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hrReturn = hr;
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}
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} while( pCurr != pTerm );
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if ( hrReturn != S_OK )
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{
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return hrReturn;
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}
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return m_pTail->m_pNext == m_pPrimary ? S_OK : S_FALSE;
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EXIT_API_CALL
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}
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