152 lines
2.7 KiB
C++
152 lines
2.7 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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//
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// FILE
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//
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// ntcache.cpp
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//
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// SYNOPSIS
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//
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// Defines the class NTCache.
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//
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// MODIFICATION HISTORY
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//
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// 05/11/1998 Original version.
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// 03/12/1999 Improve locking granularity.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <ias.h>
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#include <ntcache.h>
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//////////
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// Utility function for getting the current system time as a 64-bit integer.
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//////////
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inline DWORDLONG GetSystemTimeAsDWORDLONG() throw ()
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{
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ULARGE_INTEGER ft;
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GetSystemTimeAsFileTime((LPFILETIME)&ft);
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return ft.QuadPart;
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}
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NTCache::~NTCache()
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{
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clear();
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}
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void NTCache::clear() throw ()
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{
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Lock();
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// Release all the domains.
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for (DomainTable::iterator i = cache.begin(); i.more(); ++i)
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{
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(*i)->Release();
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}
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// Clear the hash table.
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cache.clear();
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Unlock();
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}
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DWORD NTCache::getConnection(PCWSTR domainName, LDAPConnection** cxn) throw ()
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{
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_ASSERT(cxn != NULL);
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NTDomain* domain;
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DWORD status = getDomain(domainName, &domain);
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if (status == NO_ERROR)
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{
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status = domain->getConnection(cxn);
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domain->Release();
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}
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else
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{
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*cxn = NULL;
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}
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return status;
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}
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DWORD NTCache::getDomain(PCWSTR domainName, NTDomain** domain) throw ()
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{
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_ASSERT(domain != NULL);
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DWORD status = NO_ERROR;
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Lock();
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// Check if we already have an entry for this domainName.
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NTDomain* const* existing = cache.find(domainName);
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if (existing)
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{
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(*domain = *existing)->AddRef();
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}
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else
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{
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// We don't have this domain, so create a new one ...
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*domain = NTDomain::createInstance(domainName);
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// Evict expired entries.
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evict();
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try
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{
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// Try to insert the domain ...
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cache.multi_insert(*domain);
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// ... and AddRef if we succeeded.
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(*domain)->AddRef();
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}
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catch (...)
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{
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// We don't care if the insert failed.
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}
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}
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Unlock();
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return *domain ? NO_ERROR : ERROR_NOT_ENOUGH_MEMORY;
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}
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NTDomain::Mode NTCache::getMode(PCWSTR domainName) throw ()
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{
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NTDomain::Mode mode = NTDomain::MODE_UNKNOWN;
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NTDomain* domain;
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if (getDomain(domainName, &domain) == NO_ERROR)
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{
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mode = domain->getMode();
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domain->Release();
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}
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return mode;
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}
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void NTCache::evict() throw ()
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{
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//////////
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// Note: This method is not serialized.
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//////////
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DWORDLONG now = GetSystemTimeAsDWORDLONG();
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DomainTable::iterator i = cache.begin();
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while (i.more())
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{
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if ((*i)->isObsolete(now))
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{
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// The entry has expired, so release and erase.
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(*i)->Release();
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cache.erase(i);
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}
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else
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{
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++i;
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}
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}
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}
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