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89 lines
2.0 KiB
89 lines
2.0 KiB
///////////////////////////////////////////////////////////////////////////////
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//
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// FILE
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//
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// ldapcache.h
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//
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// SYNOPSIS
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//
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// Declares the class LDAPCache.
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//
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// MODIFICATION HISTORY
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//
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// 05/07/1998 Original version.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _LDAPCACHE_H_
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#define _LDAPCACHE_H_
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#if _MSC_VER >= 1000
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#pragma once
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#endif
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#include <hashtbl.h>
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#include <iasutil.h>
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#include <ldapsrv.h>
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///////////////////////////////////////////////////////////////////////////////
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//
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// CLASS
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//
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// LDAPCache
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//
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// DESCRIPTION
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//
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// This class maintains a cache of LDAPServer objects indexed by hostname.
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//
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///////////////////////////////////////////////////////////////////////////////
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class LDAPCache
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: Guardable, NonCopyable
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{
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public:
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~LDAPCache() throw ();
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// Flushes the cache.
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void clear() throw ();
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// Either retrieves an existing LDAPServer object or creates a new one.
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// This method does not actually validate that the server exists, so it
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// only fails when unable to allocate memory. The client is responsible
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// for releasing the server when done.
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DWORD getServer(PCWSTR hostname, LDAPServer** server) throw ();
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protected:
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// Removes all expired servers from the cache.
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void evict() throw ();
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typedef PCWSTR Key;
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typedef LDAPServer* Value;
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// Hash a server object.
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struct Hasher {
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ULONG operator()(Key key) const throw ()
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{ return hash_util::hash(key); }
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};
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// Extract the key (i.e., hostname) from a server object.
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struct Extractor {
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Key operator()(const Value server) const throw ()
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{ return server->getHostname(); }
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};
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// Test two server objects for equality.
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struct KeyMatch {
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bool operator()(Key key1, Key key2) const throw ()
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{ return _wcsicmp(key1, key2) == 0; }
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};
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typedef hash_table<Key, Hasher, Value, Extractor, KeyMatch> ServerTable;
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ServerTable cache;
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};
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//////////
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// Global cache.
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//////////
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extern LDAPCache theServers;
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#endif // _LDAPCACHE_H_
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