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windows-nt/Source/XPSP1/NT/sdktools/pdh/wbemperf/refreshr.cpp

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2020-09-26 03:20:57 -05:00
//***************************************************************************
//
// (c) 1997-1999 by Microsoft Corp.
//
// REFRESHR.CPP
//
// Mapped NT5 Perf Counter Provider
//
// raymcc 02-Dec-97 Created.
// raymcc 20-Feb-98 Updated to use new initializer.
// bobw 8-Jub-98 optimized for use with NT Perf counters
//
//***************************************************************************
#include "wpheader.h"
#include <stdio.h>
#include "oahelp.inl"
#define __WBEMSECURITY 1
// HRESULT CNt5PerfProvider::CheckImpersonationLevel (void);
// BOOL CNt5PerfProvider::HasPermission (void);
// Timeout for our wait calls
#define REFRESHER_MUTEX_WAIT_TIMEOUT 10000
class CMutexReleaseMe
{
private:
HANDLE m_hMutex;
public:
CMutexReleaseMe( HANDLE hMutex ) : m_hMutex( hMutex ) {};
~CMutexReleaseMe() { if ( NULL != m_hMutex ) ReleaseMutex( m_hMutex ); };
};
//***************************************************************************
//
// RefresherCacheEl::RefresherCacheEl
//
// Constructor
//
//***************************************************************************
// ok
RefresherCacheEl::RefresherCacheEl()
{
m_dwPerfObjIx = 0;
m_pClassMap = NULL;
m_pSingleton = NULL;
m_lSingletonId = 0;
m_plIds = NULL; // array of ID's
m_lEnumArraySize = 0; // size of ID array in elements
m_pHiPerfEnum = NULL;
m_lEnumId = 0;
}
//***************************************************************************
//
// RefresherCacheEl::~RefresherCacheEl()
//
// Destructor
//
//***************************************************************************
// ok
RefresherCacheEl::~RefresherCacheEl()
{
LONG nNumInstances;
int i;
delete m_pClassMap;
if (m_pSingleton != NULL) {
m_pSingleton->Release();
m_pSingleton = NULL;
m_lSingletonId = 0;
}
nNumInstances = m_aInstances.Size();
for (i = 0; i < nNumInstances; i++) {
delete (CachedInst *) m_aInstances[i];
}
nNumInstances = m_aEnumInstances.Size();
if (nNumInstances> 0) {
IWbemObjectAccess *pAccess;
for (i = 0; i < nNumInstances ; i++) {
pAccess = (IWbemObjectAccess *)(m_aEnumInstances.GetAt(i));
if (pAccess != NULL) {
pAccess->Release();
}
}
m_aEnumInstances.Empty();
}
if (m_plIds != NULL) {
delete (m_plIds);
m_plIds = NULL;
m_lEnumArraySize = 0;
}
if (m_pHiPerfEnum != NULL) {
m_pHiPerfEnum->Release();
m_pHiPerfEnum = NULL;
}
}
//***************************************************************************
//
// CNt5Refresher constructor
//
//***************************************************************************
// ok
CNt5Refresher::CNt5Refresher(CNt5PerfProvider *pPerfProviderArg)
{
assert (pPerfProviderArg != NULL);
m_ClsidType = pPerfProviderArg->m_OriginClsid;
m_pPerfProvider = pPerfProviderArg;
m_pPerfProvider = NULL; // for testing of local class map
if (m_pPerfProvider != NULL) {
m_pPerfProvider->AddRef();
}
m_hAccessMutex = CreateMutex (NULL, TRUE, NULL);
m_dwGetGetNextClassIndex = 0;
m_lRef = 0; // COM Ref Count
m_lProbableId = 1; // Used for new IDs
m_aCache.Empty(); // clear and reset the array
RELEASE_MUTEX (m_hAccessMutex);
}
//***************************************************************************
//
// CNt5Refresher destructor
//
//***************************************************************************
// ok
CNt5Refresher::~CNt5Refresher()
{
int nNumElements;
int i;
PRefresherCacheEl pCacheEl;
assert (m_lRef == 0);
// Make sure we get access to the mutex before we try and clean things up.
// If we don't get it in a reasonable time, something's up. Since we're
// destructing, we'll just quietly let stuff go.
if ( WaitForSingleObject( m_hAccessMutex, REFRESHER_MUTEX_WAIT_TIMEOUT ) == WAIT_OBJECT_0 )
{
// This will auto-release the mutex in case something bad happens
CMutexReleaseMe mrm( m_hAccessMutex );
nNumElements = m_aCache.Size();
for (i = 0; i < nNumElements; i++) {
pCacheEl = (PRefresherCacheEl)m_aCache[i];
// We want to call this once for each instance
for ( int n = 0; n < pCacheEl->m_aInstances.Size(); n++ )
{
m_PerfObj.RemoveClass (pCacheEl->m_pClassMap->m_pClassDef);
}
// If we have a Singleton value, RemoveClass should be
// called once more
if ( NULL != pCacheEl->m_pSingleton )
{
m_PerfObj.RemoveClass (pCacheEl->m_pClassMap->m_pClassDef);
}
// And finally if we have an enumerator, remove the class
// once more.
if ( NULL != pCacheEl->m_pHiPerfEnum )
{
m_PerfObj.RemoveClass (pCacheEl->m_pClassMap->m_pClassDef);
}
delete pCacheEl;
}
if (m_pPerfProvider != NULL) {
m_pPerfProvider->Release();
m_pPerfProvider = NULL;
}
}
CloseHandle (m_hAccessMutex);
}
//***************************************************************************
//
// CNt5Refresher::Refresh
//
// Executed to refresh a set of instances bound to the particular
// refresher.
//
//***************************************************************************
// ok
HRESULT CNt5Refresher::Refresh(/* [in] */ long lFlags)
{
HRESULT hrReturn = WBEM_S_NO_ERROR;
HRESULT hReturn = S_OK;
BOOL bRes;
UNREFERENCED_PARAMETER(lFlags);
BOOL bNeedCoImpersonate = FALSE;
//
// this is ugly
// wmicookr is not impersonating, because
// it relys on other provider to do that
// but, it calls the IWbemRefresher::Refresh when it's inside winmgmt or wmiprvse
// and it calls it from an UN-Impersonated thread
// so, we need that the provider calls CoImpersonateClient
// on a Refresh invocation, that is expensive in general,
// only if the provider has been invoked through the Server CLSID
//
BOOL fRevert;
if (CNt5PerfProvider::CLSID_SERVER == m_ClsidType)
{
#ifdef __WBEMSECURITY
hReturn = CoImpersonateClient(); // make sure we're legit.
fRevert = SUCCEEDED( hReturn );
// The following error appears to occur when we are in-proc and there is no
// proxy/stub, so we are effectively impersonating already
if ( RPC_E_CALL_COMPLETE == hReturn ) {
hReturn = S_OK;
}
if (S_OK == hReturn) {
hReturn = CNt5PerfProvider::CheckImpersonationLevel();
}
// Check Registry security here.
if ((hReturn != S_OK) || (!CNt5PerfProvider::HasPermission())) {
// if Impersonation level is incorrect or
// the caller doesn't have permission to read
// from the registry, then they cannot continue
hReturn = WBEM_E_ACCESS_DENIED;
}
#else
hReturn = S_OK;
#endif
}
if (hReturn == S_OK)
{
// Make sure we get access to the mutex before we continue. If we can't
// get to it, something's wrong, so we'll just assume we are busy.
if ( WaitForSingleObject( m_hAccessMutex, REFRESHER_MUTEX_WAIT_TIMEOUT ) == WAIT_OBJECT_0 )
{
// This will auto-release the mutex in case something bad happens
CMutexReleaseMe mrm( m_hAccessMutex );
bRes = PerfHelper::RefreshInstances(this);
if (!bRes) {
hrReturn = WBEM_E_FAILED;
}
}
else
{
hrReturn = WBEM_E_REFRESHER_BUSY;
}
}
if (CNt5PerfProvider::CLSID_SERVER == m_ClsidType)
{
#ifdef __WBEMSECURITY
// Revert if we successfuly impersonated the user
if ( fRevert )
{
CoRevertToSelf();
}
#endif
}
return hrReturn;
}
//***************************************************************************
//
// CNt5Refresher::AddRef
//
// Standard COM AddRef().
//
//***************************************************************************
// ok
ULONG CNt5Refresher::AddRef()
{
return InterlockedIncrement(&m_lRef);
}
//***************************************************************************
//
// CNt5Refresher::Release
//
// Standard COM Release().
//
//***************************************************************************
// ok
ULONG CNt5Refresher::Release()
{
long lRef = InterlockedDecrement(&m_lRef);
if(lRef == 0)
delete this;
return lRef;
}
//***************************************************************************
//
// CNt5Refresher::QueryInterface
//
// Standard COM QueryInterface().
//
//***************************************************************************
// ok
HRESULT CNt5Refresher::QueryInterface(REFIID riid, void** ppv)
{
if (riid == IID_IUnknown || riid == IID_IWbemRefresher)
{
*ppv = (IWbemRefresher *) this;
AddRef();
return S_OK;
}
else return E_NOINTERFACE;
}
//***************************************************************************
//
// CNt5Refresher::RemoveObject
//
// Removes an object from the refresher. Since we don't know
// by ID alone which class it is, we loop through all the ones we
// have until somebody claims it and returns TRUE for a removal.(
//
//***************************************************************************
// ok
BOOL CNt5Refresher::RemoveObject(LONG lId)
{
BOOL bReturn = FALSE;
BOOL bRes;
PRefresherCacheEl pCacheEl;
int nNumElements;
// Make sure we get access to the mutex before we continue. If we can't
// get to it, something's wrong, so we'll just assume we are busy.
if ( WaitForSingleObject( m_hAccessMutex, REFRESHER_MUTEX_WAIT_TIMEOUT ) == WAIT_OBJECT_0 )
{
// This will auto-release the mutex in case something bad happens
CMutexReleaseMe mrm( m_hAccessMutex );
nNumElements = m_aCache.Size();
for (int i = 0; i < nNumElements; i++)
{
pCacheEl = PRefresherCacheEl(m_aCache[i]);
assert (pCacheEl != NULL);
bRes = pCacheEl->RemoveInst(lId);
if (bRes == TRUE) {
// found the matching instance so
// de register this with the perf library
m_PerfObj.RemoveClass (pCacheEl->m_pClassMap->m_pClassDef);
bReturn = TRUE;
break;
}
}
}
else
{
SetLastError( (ULONG) WBEM_E_REFRESHER_BUSY );
bReturn = FALSE;
}
return bReturn;
}
//***************************************************************************
//
// CNt5Refresher::FindSingletonInst
//
// Based on a perf object identification, locates a singleton WBEM
// instance of that class within this refresher and returns the pointer
// to it and its WBEM class info.
//
// Note that the <dwPerfObjIx> maps directly to a WBEM Class entry.
//
// To save execution time, we don't AddRef() the return value and the
// caller doesn't Release().
//
//***************************************************************************
// ok
BOOL CNt5Refresher::FindSingletonInst(
IN DWORD dwPerfObjIx,
OUT IWbemObjectAccess **pInst,
OUT CClassMapInfo **pClsMap
)
{
BOOL bReturn = FALSE;
PRefresherCacheEl pCacheEl;
int l = 0;
int u = m_aCache.Size() - 1;
int m;
// Binary search the cache.
// ========================
while (l <= u) {
m = (l + u) / 2;
pCacheEl = PRefresherCacheEl(m_aCache[m]);
if (dwPerfObjIx < pCacheEl->m_dwPerfObjIx) {
u = m - 1;
} else if (dwPerfObjIx > pCacheEl->m_dwPerfObjIx) {
l = m + 1;
} else {
*pClsMap = pCacheEl->m_pClassMap;
*pInst = pCacheEl->m_pSingleton; // No AddRef() caller doesn't
// change ref count
bReturn = TRUE;
break;
}
}
// Not found
// =========
return bReturn;
}
//***************************************************************************
//
// CNt5Refresher::FindInst
//
// Based on a perf object identification, locates a WBEM instance of
// that class within this refresher and returns the pointer to it.
//
// Note that the <dwPerfObjIx> maps directly to a WBEM Class entry.
//
// To save execution time, we don't AddRef() the return value and the
// caller doesn't Release().
//
//***************************************************************************
// ok
BOOL CNt5Refresher::FindInst(
IN DWORD dwPerfObjIx,
IN LPWSTR pszInstName,
OUT IWbemObjectAccess **pInst,
OUT CClassMapInfo **pClsMap
)
{
BOOL bReturn = FALSE;
IWbemObjectAccess *pTmp;
PRefresherCacheEl pCacheEl;
int l = 0;
int u = m_aCache.Size() - 1;
int m;
// Binary search the cache.
// ========================
while (l <= u) {
m = (l + u) / 2;
pCacheEl = PRefresherCacheEl(m_aCache[m]);
if (dwPerfObjIx < pCacheEl->m_dwPerfObjIx) {
u = m - 1;
} else if (dwPerfObjIx > pCacheEl->m_dwPerfObjIx) {
l = m + 1;
} else {
// We found the class. Now do we have the instance?
// =================================================
pTmp = pCacheEl->FindInst(pszInstName);
if (pTmp == 0) {
bReturn = FALSE; // Didn't have it.
} else {
*pInst = pTmp;
*pClsMap = pCacheEl->m_pClassMap;
bReturn = TRUE;
}
break;
}
}
// Not found
// =========
return bReturn;
}
//***************************************************************************
//
// CNt5Refresher::GetObjectIds
//
// Gets a list of all the perf object Ids corresponding to the instances
// in the refresher.
//
// Caller uses operator delete to deallocate the returned array.
//
//***************************************************************************
// ok
BOOL CNt5Refresher::GetObjectIds(
DWORD *pdwNumIds,
DWORD **pdwIdList
)
{
DWORD *pdwIds;
int nNumElements;
BOOL bReturn;
nNumElements = m_aCache.Size();
pdwIds = new DWORD[nNumElements ];
if (pdwIds != NULL) {
for (int i = 0; i < nNumElements; i++) {
pdwIds[i] = PRefresherCacheEl(m_aCache[i])->m_dwPerfObjIx;
}
*pdwIdList = pdwIds;
*pdwNumIds = nNumElements;
bReturn = TRUE;
} else {
// unable to create buffer
bReturn = FALSE;
}
return bReturn;
}
//***************************************************************************
//
// CNt5Refresher::FindUnusedId
//
// Finds an ID not in use for new objects to be added to the refresher.
//
//***************************************************************************
// ok
LONG CNt5Refresher::FindUnusedId()
{
PRefresherCacheEl pEl;
PCachedInst pInst;
int nRetries = 0x100000; // A hundred thousand retries
LONG lReturn = -1;
int i;
int i2;
int nNumElements;
int nNumInstances;
// assume the object is locked for access
Restart:
while (nRetries--) {
i = 0;
nNumElements = m_aCache.Size();
while(i < nNumElements) {
pEl = PRefresherCacheEl(m_aCache[i]);
// test enum Id first
if (pEl->m_lEnumId == m_lProbableId) {
m_lProbableId++;
goto Restart;
}
i2 = 0;
nNumInstances = pEl->m_aInstances.Size();
while (i2 < nNumInstances) {
pInst = (PCachedInst) pEl->m_aInstances[i2];
if (pInst->m_lId == m_lProbableId) {
m_lProbableId++;
goto Restart;
}
i2++;
}
i++;
}
lReturn = m_lProbableId;
break;
}
return lReturn;
}
//***************************************************************************
//
// RefresherCacheEl::RemoveInst
//
// Removes the requested instances from the cache element for a particular
// class.
//
//***************************************************************************
// ok
BOOL RefresherCacheEl::RemoveInst(LONG lId)
{
BOOL bReturn = FALSE;
int i;
PCachedInst pInst;
int nNumInstances;
if (lId == m_lEnumId) {
// then clean out the enumerator for this object
nNumInstances = m_aEnumInstances.Size();
if (nNumInstances> 0) {
IWbemObjectAccess *pAccess;
for (i = 0; i < nNumInstances ; i++) {
pAccess = (IWbemObjectAccess *)(m_aEnumInstances.GetAt(i));
if (pAccess != NULL) {
pAccess->Release();
}
}
m_aEnumInstances.Empty();
}
if (m_plIds != NULL) {
delete (m_plIds);
m_plIds = NULL;
m_lEnumArraySize = 0;
}
if (m_pHiPerfEnum != NULL) {
m_pHiPerfEnum->Release();
m_pHiPerfEnum = NULL;
}
// Now, if this is a singleton (m_pSingleton != NULL),
// then check if m_aInstances is empty. If so, then
// no instances are referencing the singleton object
// so we can free up its resources.
if ( NULL != m_pSingleton && 0 == m_aInstances.Size() )
{
m_pSingleton->Release();
m_pSingleton = NULL;
}
return TRUE;
} else {
// walk the instances to find a match
nNumInstances = m_aInstances.Size();
for (i = 0; i < nNumInstances; i++) {
pInst = (PCachedInst) m_aInstances[i];
if (lId == pInst->m_lId) {
delete pInst;
m_aInstances.RemoveAt(i);
bReturn = TRUE;
break;
}
}
// Now, if we removed an instance, m_aInstances is empty
// and this is a singleton (m_pSingleton != NULL), then
// check if m_pHiPerfEnum is NULL, meaning no Enumerator
// exists, so none of its instances will be referencing
// the singleton object, so we can free up its resources.
if ( NULL != m_pSingleton
&& bReturn
&& 0 == m_aInstances.Size()
&& NULL == m_pHiPerfEnum )
{
m_pSingleton->Release();
m_pSingleton = NULL;
}
if ( bReturn )
{
}
}
return bReturn;
}
//***************************************************************************
//
// CNt5Refresher::AddEnum
//
// Creates an enumerator for the specified class
// to it.
//
//***************************************************************************
// ?
BOOL CNt5Refresher::AddEnum (
IN IWbemHiPerfEnum *pEnum, // enum interface pointer
IN CClassMapInfo *pClsMap, // Class of object
OUT LONG *plId // id for new enum
)
{
BOOL bRes = FALSE;
LONG lStatus;
LONG lNewId;
PRefresherCacheEl pWorkEl;
int iReturn;
// Make sure we get access to the mutex before we continue. If we can't
// get to it, something's wrong, so we'll just assume we are busy.
if ( WaitForSingleObject( m_hAccessMutex, REFRESHER_MUTEX_WAIT_TIMEOUT ) == WAIT_OBJECT_0 )
{
// This will auto-release the mutex in case something bad happens
CMutexReleaseMe mrm( m_hAccessMutex );
lNewId = FindUnusedId();
if (lNewId != -1) {
// First, find the cache element corresponding to this object.
// ===========================================================
pWorkEl = GetCacheEl(pClsMap);
// If <pWorkEl> is NULL, we didn't have anything in the cache
// and have to add a new one.
// ==========================================================
if (pWorkEl == NULL) {
bRes = AddNewCacheEl(pClsMap, &pWorkEl);
}
if (pWorkEl != NULL) {
if (pWorkEl->m_pHiPerfEnum == NULL) {
// then we can init it as it hasn't been opened
pEnum->AddRef();
pWorkEl->m_pHiPerfEnum = pEnum;
pWorkEl->m_lEnumId = lNewId;
assert (pWorkEl->m_aEnumInstances.Size() == 0L);
bRes = TRUE;
if (pClsMap->IsSingleton()) {
LONG lNumObjInstances;
// then create the singleton IWbemObjectAccess entry here
lNumObjInstances = 1;
// If we do NOT have a singleton pointer, make it so.
if ( NULL == pWorkEl->m_pSingleton )
{
// add the new IWbemObjectAccess pointers
IWbemClassObject *pClsObj;
pWorkEl->m_pClassMap->m_pClassDef->SpawnInstance(0, &pClsObj);
pClsObj->QueryInterface(IID_IWbemObjectAccess, (LPVOID *) &pWorkEl->m_pSingleton);
pClsObj->Release(); // We only need the IWbemObjectAccess pointer
// We don't really care about the singleton id anymore
// pWorkEl->m_lSingletonId = pWorkEl->m_plIds[0];
}
if (pWorkEl->m_aEnumInstances.Size() < lNumObjInstances) {
// alloc and init the ID array
if (pWorkEl->m_plIds != NULL) {
delete (pWorkEl->m_plIds);
}
pWorkEl->m_lEnumArraySize = lNumObjInstances;
pWorkEl->m_plIds = new LONG[lNumObjInstances];
if (pWorkEl->m_plIds != NULL) {
pWorkEl->m_plIds[0] = 0;
// AddRef the singleton class and place it in the enuminstances array
pWorkEl->m_pSingleton->AddRef();
iReturn = pWorkEl->m_aEnumInstances.Add (pWorkEl->m_pSingleton);
if (iReturn == CFlexArray::no_error) {
// Add the singleton object to the enumerator. Then, all we have to
// do is update this object and we will, by default update the
// enumerator, since the number of objects in it will always
// be one.
pWorkEl->m_pHiPerfEnum->AddObjects(
0,
1,
pWorkEl->m_plIds,
(IWbemObjectAccess __RPC_FAR *__RPC_FAR *)pWorkEl->m_aEnumInstances.GetArrayPtr());
}
else {
SetLastError((ULONG) WBEM_E_OUT_OF_MEMORY);
bRes = FALSE;
}
} else {
SetLastError ((ULONG)WBEM_E_OUT_OF_MEMORY);
bRes = FALSE;
}
}
assert (pWorkEl->m_aEnumInstances.Size() >= lNumObjInstances);
}
// load provider library since all went OK so far
lStatus = m_PerfObj.AddClass (pClsMap->m_pClassDef, FALSE);
if (lStatus == ERROR_SUCCESS) {
// return new ID & successful status
*plId = lNewId;
bRes = TRUE;
} else {
// set error: Class or library failed to load
SetLastError ((ULONG)WBEM_E_PROVIDER_FAILURE);
bRes = FALSE;
}
} else {
// this class already has an enumerator
// what to do here?
// for now we'll return the id of the existing one
SetLastError ((ULONG)WBEM_E_ILLEGAL_OPERATION);
bRes = FALSE;
}
}
}
} // IF WaitForSingleObject
else
{
bRes = FALSE;
// We're locked out of the mutex
SetLastError ((ULONG)WBEM_E_REFRESHER_BUSY);
}
return bRes;
}
//***************************************************************************
//
// CNt5Refresher::AddObject
//
// Adds the requested object to the refresher and assigns an ID
// to it.
//
//***************************************************************************
// ?
BOOL CNt5Refresher::AddObject(
IN IWbemObjectAccess **ppObj, // Object to add
IN CClassMapInfo *pClsMap, // Class of object
OUT LONG *plId // The id of the object added
)
{
BOOL bRes = FALSE;
LONG lStatus;
LONG lNewId;
PRefresherCacheEl pWorkEl;
// Make sure we get access to the mutex before we continue. If we can't
// get to it, something's wrong, so we'll just assume we are busy.
if ( WaitForSingleObject( m_hAccessMutex, REFRESHER_MUTEX_WAIT_TIMEOUT ) == WAIT_OBJECT_0 )
{
// This will auto-release the mutex in case something bad happens
CMutexReleaseMe mrm( m_hAccessMutex );
lNewId = FindUnusedId();
if (lNewId != -1) {
// First, find the cache element corresponding to this object.
// ===========================================================
pWorkEl = GetCacheEl(pClsMap);
// If <pWorkEl> is NULL, we didn't have anything in the cache
// and have to add a new one.
// ==========================================================
if (pWorkEl == NULL) {
bRes = AddNewCacheEl(pClsMap, &pWorkEl);
}
if (pWorkEl != NULL) {
// If here, we have successfully added a new cache element.
// ========================================================
bRes = pWorkEl->InsertInst(ppObj, lNewId);
if (bRes) {
// load provider library since all went OK so far
lStatus = m_PerfObj.AddClass (pClsMap->m_pClassDef, FALSE);
if (lStatus == ERROR_SUCCESS) {
// return new ID & successful status
*plId = lNewId;
bRes = TRUE;
} else {
// set error: Class or library failed to load
SetLastError ((ULONG)WBEM_E_PROVIDER_FAILURE);
bRes = FALSE;
}
}
}
}
} // IF acquired mutex
else
{
bRes = FALSE;
// Return a busy error
SetLastError ((ULONG)WBEM_E_REFRESHER_BUSY);
}
return bRes;
}
//***************************************************************************
//
// CNt5Refresher::AddNewCacheEl
//
// Adds a new cache element in the proper position so that a binary
// search on perf object id can occur later.
//
//***************************************************************************
// ok
BOOL CNt5Refresher::AddNewCacheEl(
IN CClassMapInfo *pClsMap,
PRefresherCacheEl *pOutput
)
{
// assumes the object is locked for access
PRefresherCacheEl pWorkEl;
PRefresherCacheEl pNew = 0;
int i;
int nNumElements;
BOOL bReturn = FALSE;
* pOutput = NULL;
pNew = new RefresherCacheEl;
if (pNew != NULL) {
pNew->m_dwPerfObjIx = pClsMap->GetObjectId();
pNew->m_pClassMap = pClsMap->CreateDuplicate();
if (pNew->m_pClassMap != NULL) {
nNumElements = m_aCache.Size();
for (i = 0; i < nNumElements; i++) {
// walk through the list of cache elements
// and find the first entry that has a
// larger index then the one we are adding
pWorkEl = PRefresherCacheEl(m_aCache[i]);
if (pNew->m_dwPerfObjIx < pWorkEl->m_dwPerfObjIx) {
m_aCache.InsertAt(i, pNew);
*pOutput = pNew;
bReturn = TRUE;
break;
}
}
if (i == nNumElements) {
// this entry is larger than anyone in the list
// so Add it to the end.
// =====-===============
m_aCache.Add(pNew);
*pOutput = pNew;
bReturn = TRUE;
}
}
else {
// cannot duplicate ClassMap,
// delte allocated object and return false
delete pNew;
}
} else {
// return false
}
return bReturn;
}
//***************************************************************************
//
// CNt5Refresher::GetCacheEl
//
//***************************************************************************
// ok
PRefresherCacheEl CNt5Refresher::GetCacheEl(
CClassMapInfo *pClsMap
)
{
// assumes the structure is locked for access
PRefresherCacheEl pReturn = NULL;
PRefresherCacheEl pWorkEl;
int i;
int nNumElements;
DWORD dwObjectIdToFind;
if (pClsMap != NULL) {
dwObjectIdToFind = pClsMap->GetObjectId();
nNumElements = m_aCache.Size();
for (i = 0; i < nNumElements; i++) {
pWorkEl = PRefresherCacheEl(m_aCache[i]);
if (pWorkEl->m_pClassMap->GetObjectId() == dwObjectIdToFind) {
pReturn = pWorkEl;
break;
}
}
}
return pReturn;
}
//***************************************************************************
//
// RefresherCacheEl::FindInstance
//
// Finds an instance in the current cache element for a particular instance.
// For this to work, the instances have to be sorted by name.
//
//***************************************************************************
// ok
IWbemObjectAccess *RefresherCacheEl::FindInst(
LPWSTR pszInstName
)
{
// Binary search the cache.
// ========================
int l = 0;
int u = m_aInstances.Size() - 1;
int m;
CachedInst *pInst;
while (l <= u) {
m = (l + u) / 2;
pInst = PCachedInst(m_aInstances[m]);
if (_wcsicmp(pszInstName, pInst->m_pName) < 0) {
u = m - 1;
} else if (_wcsicmp(pszInstName, pInst->m_pName) > 0) {
l = m + 1;
} else {
// We found the instance.
// ======================
return pInst->m_pInst;
}
}
// Not found
// =========
return NULL;
}
//***************************************************************************
//
// Inserts a new instance.
//
//***************************************************************************
//
BOOL RefresherCacheEl::InsertInst(IWbemObjectAccess **ppNew, LONG lNewId)
{
// Save the value passed in
IWbemObjectAccess* pNew = *ppNew;
IWbemClassObject *pObj;
VARIANT v;
PCachedInst pNewInst;
DWORD dwInstanceNameLength;
PCachedInst pTest;
BOOL bReturn = FALSE;
HRESULT hRes;
int nNumInstances;
// Check for singleton.
// ====================
if (m_pClassMap->IsSingleton()) {
// If we don't already have an object, use the one passed in. Otherwise
// we will replace it.
if ( NULL == m_pSingleton )
{
m_pSingleton = pNew;
m_pSingleton->AddRef();
// We don't really need the id anymore
// m_lSingletonId = lNewId;
}
else
{
// Now we're sneaking around by replacing *ppNew with the
// singleton we already have. We must release *ppNew in
// order to get away with this.
(*ppNew)->Release();
// We need to AddRef() this because *ppNew is now referencing it
m_pSingleton->AddRef();
*ppNew = m_pSingleton;
pNew = m_pSingleton;
}
// Now we will Add this instance just like any other
pNewInst = new CachedInst;
// assert (pNewInst != NULL);
if ( pNewInst != NULL )
{
// For singletons, none of the other pointers
// should matter.
pNewInst->m_lId = lNewId;
pNewInst->m_pInst = pNew;
pNewInst->m_pInst->AddRef();
// We are saving the name just to be safe (It will
// really only be an "@", and I don't believe it
// will be accessed anywhere else. I hope...)
pNewInst->m_pName = Macro_CloneLPWSTR(L"@");
// assert (pNewInst->m_pName != NULL);
if ( NULL != pNewInst->m_pName )
{
// We can just add this in, since any entries will all be the
// same anyway.
m_aInstances.Add(pNewInst);
bReturn = TRUE;
}
else // Memory Allocation failed
{
bReturn = FALSE;
SetLastError ((DWORD)WBEM_E_OUT_OF_MEMORY);
delete(pNewInst);
}
}
else // Memory allocation failed
{
bReturn = FALSE;
SetLastError ((DWORD)WBEM_E_OUT_OF_MEMORY);
}
} else {
VariantInit(&v);
// For multi-instance, get the instance name.
// ==========================================
hRes = pNew->QueryInterface(IID_IWbemClassObject, (LPVOID *) &pObj);
assert (hRes == NO_ERROR);
if (hRes == NO_ERROR) {
hRes = pObj->Get(CBSTR(cszName), 0, &v, 0, 0);
assert (hRes == NO_ERROR);
if (hRes == NO_ERROR) {
if (v.vt == VT_BSTR) {
bReturn = TRUE;
} else {
bReturn = FALSE;
// the object passed in should have an instance name
SetLastError ((DWORD)WBEM_E_INVALID_OBJECT_PATH);
}
}
pObj->Release();
if (bReturn) {
// Construct the new instance.
// ===========================
pNewInst = new CachedInst;
// assert (pNewInst != NULL);
if (pNewInst != NULL) {
pNewInst->m_lId = lNewId;
pNewInst->m_pInst = pNew;
pNewInst->m_pInst->AddRef();
pNewInst->m_pName = Macro_CloneLPWSTR(V_BSTR(&v));
// assert (pNewInst->m_pName != NULL);
if (pNewInst->m_pName != NULL) {
dwInstanceNameLength = lstrlenW (pNewInst->m_pName) + 1;
// parse the instance string now to save processing time later
pNewInst->m_szParentName = new WCHAR[dwInstanceNameLength];
// assert (pNewInst->m_szParentName != NULL);
pNewInst->m_szInstanceName = new WCHAR[dwInstanceNameLength];
// assert (pNewInst->m_szInstanceName != NULL);
if ((pNewInst->m_szParentName != NULL) &&
(pNewInst->m_szInstanceName != NULL)) {
// break the instance name into components
bReturn = PerfHelper::ParseInstanceName (pNewInst->m_pName,
pNewInst->m_szInstanceName,
pNewInst->m_szParentName ,
&pNewInst->m_dwIndex);
if (bReturn) {
bReturn = FALSE; // to prime it.
// Now place the name in the instance cache element.
// =================================================
nNumInstances = m_aInstances.Size();
for (int i = 0; i < nNumInstances; i++) {
// see if it belongs in the list
pTest = PCachedInst(m_aInstances[i]);
if (_wcsicmp(V_BSTR(&v), pTest->m_pName) < 0) {
m_aInstances.InsertAt(i, pNewInst);
bReturn = TRUE;
// once it's been added,
// there's no point in continuing
break;
}
}
if (!bReturn) {
// this goes at the end of the list
m_aInstances.Add(pNewInst);
bReturn = TRUE;
} else {
// unable to create instance
SetLastError ((DWORD)WBEM_E_INVALID_OBJECT_PATH);
}
}
}
// clean up if there's an error
if (!bReturn) {
if (pNewInst->m_szParentName != NULL) {
delete (pNewInst->m_szParentName);
}
if (pNewInst->m_szInstanceName != NULL) {
delete pNewInst->m_szInstanceName;
}
delete (pNewInst->m_pName);
bReturn = FALSE;
delete (pNewInst);
}
} else {
// unable to alloc memory
bReturn = FALSE;
SetLastError ((DWORD)WBEM_E_OUT_OF_MEMORY);
delete (pNewInst);
}
} else {
// unable to alloc memory
bReturn = FALSE;
SetLastError ((DWORD)WBEM_E_OUT_OF_MEMORY);
}
} else {
// return FALSE
}
} else {
// return FALSE
}
VariantClear(&v);
}
return bReturn;
}
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