104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1998, Microsoft Corp. All rights reserved.
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//
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// FILE
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//
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// EAPSessionTable.h
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//
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// SYNOPSIS
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//
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// This file defines the class EAPSessionTable.
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//
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// MODIFICATION HISTORY
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//
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// 01/15/1998 Original version.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _EAPSESSIONTABLE_H_
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#define _EAPSESSIONTABLE_H_
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#include <guard.h>
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#include <nocopy.h>
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#include <hashtbl.h>
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#include <list>
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#include <EAPSession.h>
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///////////////////////////////////////////////////////////////////////////////
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//
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// CLASS
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//
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// EAPSessionTable
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//
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// DESCRIPTION
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//
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// This class maintains a collection of EAPSession objects indexed by
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// session ID. The table also enforces a sessionTimeout which is the
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// maximum time a session will be kept before being deleted.
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//
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///////////////////////////////////////////////////////////////////////////////
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class EAPSessionTable
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: Guardable, NonCopyable
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{
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public:
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EAPSessionTable() throw (std::bad_alloc);
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~EAPSessionTable();
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// Session timeout is specified in milliseconds.
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DWORD getSessionTimeout() const throw ();
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void setSessionTimeout(DWORD newVal) throw ();
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DWORD getMaxSessions() const throw ()
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{ return maxSessions; }
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void setMaxSessions(DWORD newVal) throw ()
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{ maxSessions = newVal; }
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// Clears and deletes all sessions.
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void clear();
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void insert(EAPSession* session);
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EAPSession* remove(DWORD key) throw ();
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protected:
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// Evicts all expired sessions.
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void evict(DWORDLONG now) throw ();
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// Evicts the oldest session.
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// Results are undefined if the session table is empty.
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void evictOldest() throw ();
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// List of (Session Expiry, Session) pairs. This list is kept sorted
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// by expiry and is used to evict expired sessions.
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typedef std::list < std::pair < DWORDLONG, EAPSession* > > SessionList;
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// A Session entry binds a SessionList iterator to a session. This allows
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// for efficient updating of the session list.
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typedef std::pair < EAPSession*, SessionList::iterator > SessionEntry;
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// Functor used for extracting the session ID from a SessionEntry.
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struct Extractor {
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DWORD operator()(const SessionEntry& entry) const throw ()
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{ return entry.first->getID(); }
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};
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// Table of sessions indexed by session ID. Each entry also has an iterator
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// into the SessionList to allow for efficient removal.
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typedef hash_table < DWORD,
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identity<DWORD>,
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SessionEntry,
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Extractor
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> SessionTable;
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SessionList byExpiry;
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SessionTable byID;
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DWORDLONG sessionTimeout;
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DWORD maxSessions; // Max. number of active sessions.
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};
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#endif // _EAPSESSIONTABLE_H_
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