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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
//
/*============================================================
**
** Header: RCWRefCache.h
**
**
** Purpose: Defines RCWRefCache class
** This class maintains per-AppDomain cache that can be used
** by RCW to reference other CCWs
===========================================================*/
#ifndef _H_RCWREFCACHE_
#define _H_RCWREFCACHE_
#ifdef FEATURE_COMINTEROP
class RCWRefCache
{
public :
RCWRefCache(AppDomain *pAppDomain);
~RCWRefCache();
//
// Add a reference from RCW to CCW
//
HRESULT AddReferenceFromRCWToCCW(RCW *pRCW, ComCallWrapper *pCCW);
//
// Enumerate all Jupiter RCWs in the RCW cache and do the callback
// I'm using template here so there is no perf penality
//
template<class Function, class T> HRESULT EnumerateAllJupiterRCWs(Function fn, T userData)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_COOPERATIVE;
}
CONTRACTL_END;
HRESULT hr;
// Go through the RCW cache and call the callback for all Jupiter objects
RCWCache *pRCWCache = m_pAppDomain->GetRCWCacheNoCreate();
if (pRCWCache != NULL)
{
SHash<RCWCache::RCWCacheTraits> *pHashMap = &pRCWCache->m_HashMap;
for (SHash<RCWCache::RCWCacheTraits>::Iterator it = pHashMap->Begin(); it != pHashMap->End(); it++)
{
RCW *pRCW = *it;
_ASSERTE(pRCW != NULL);
if (pRCW->IsJupiterObject())
{
hr = fn(pRCW, userData);
if (FAILED(hr))
{
return hr;
}
}
}
}
return S_OK;
}
//
// Reset dependent handle cache by assigning 0 to m_dwDepHndListFreeIndex.
//
void ResetDependentHandles();
//
// Shrink the dependent handle cache if necessary (will destroy handles) and clear unused handles.
//
void ShrinkDependentHandles();
private :
//
// Add RCW -> CCW reference using dependent handle
// May fail if OOM
//
HRESULT AddReferenceUsingDependentHandle(RCW *pRCW, ComCallWrapper *pCCW);
private :
AppDomain *m_pAppDomain; // Domain
CQuickArrayList<OBJECTHANDLE> m_depHndList; // Internal DependentHandle cache
// non-NULL dependent handles followed by NULL slots
DWORD m_dwDepHndListFreeIndex; // The starting index where m_depHndList has available slots
DWORD m_dwShrinkHint; // Keep track of how many times we use less than half handles
};
#endif // FEATURE_COMINTEROP
#endif // _H_RCWREFCACHE_
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