124 lines
2.3 KiB
C++
124 lines
2.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// FILE
|
|
//
|
|
// ldapcache.cpp
|
|
//
|
|
// SYNOPSIS
|
|
//
|
|
// Defines the class LDAPCache.
|
|
//
|
|
// MODIFICATION HISTORY
|
|
//
|
|
// 05/08/1998 Original version.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <ias.h>
|
|
#include <ldapcache.h>
|
|
|
|
//////////
|
|
// Utility function for getting the current system time as a 64-bit integer.
|
|
//////////
|
|
inline DWORDLONG GetSystemTimeAsDWORDLONG() throw ()
|
|
{
|
|
ULARGE_INTEGER ft;
|
|
GetSystemTimeAsFileTime((LPFILETIME)&ft);
|
|
return ft.QuadPart;
|
|
}
|
|
|
|
LDAPCache::~LDAPCache()
|
|
{
|
|
clear();
|
|
}
|
|
|
|
void LDAPCache::clear() throw ()
|
|
{
|
|
Lock();
|
|
|
|
// Release all the servers.
|
|
for (ServerTable::iterator i = cache.begin(); i.more(); ++i)
|
|
{
|
|
(*i)->Release();
|
|
}
|
|
|
|
// Clear the hash table.
|
|
cache.clear();
|
|
|
|
Unlock();
|
|
}
|
|
|
|
DWORD LDAPCache::getServer(PCWSTR hostname, LDAPServer** server) throw ()
|
|
{
|
|
_ASSERT(server != NULL);
|
|
|
|
DWORD status = NO_ERROR;
|
|
|
|
Lock();
|
|
|
|
// Check if we already have an entry for this hostname.
|
|
LDAPServer* const* existing = cache.find(hostname);
|
|
|
|
if (existing)
|
|
{
|
|
(*server = *existing)->AddRef();
|
|
}
|
|
|
|
// Otherwise, create a new entry.
|
|
else if (*server = LDAPServer::createInstance(hostname))
|
|
{
|
|
// Periodically evict expired entries. We can be very lazy about this
|
|
// since there is no harm in returning an expired entry.
|
|
if (cache.size() % 4 == 0)
|
|
{
|
|
evict();
|
|
}
|
|
|
|
try
|
|
{
|
|
cache.multi_insert(*server);
|
|
|
|
// The insert succeeded so AddRef the entry.
|
|
(*server)->AddRef();
|
|
}
|
|
catch (...)
|
|
{
|
|
// We don't really care that the insert failed since we still have a
|
|
// valid server object to return to the client.
|
|
}
|
|
}
|
|
else
|
|
{
|
|
status = ERROR_NOT_ENOUGH_MEMORY;
|
|
}
|
|
|
|
Unlock();
|
|
|
|
return status;
|
|
}
|
|
|
|
void LDAPCache::evict() throw ()
|
|
{
|
|
//////////
|
|
// Note: This method is not serialized.
|
|
//////////
|
|
|
|
DWORDLONG now = GetSystemTimeAsDWORDLONG();
|
|
|
|
ServerTable::iterator i = cache.begin();
|
|
|
|
while (i.more())
|
|
{
|
|
if ((*i)->getExpiry() >= now)
|
|
{
|
|
// The entry has expired, so release and erase.
|
|
(*i)->Release();
|
|
cache.erase(i);
|
|
}
|
|
else
|
|
{
|
|
++i;
|
|
}
|
|
}
|
|
}
|