Source code of Windows XP (NT5)
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2.7 KiB

//
// MODULE: RecentUse.cpp
//
// PURPOSE: To maintain a "session" this can track whether a give value (either
// a cookie value or an IP address) has been "recently" used
//
// PROJECT: Generic Troubleshooter DLL for Microsoft AnswerPoint
//
// COMPANY: Saltmine Creative, Inc. (206)-284-7511 [email protected]
//
// AUTHOR: Joe Mabel
//
// ORIGINAL DATE: 11-4-98
//
// NOTES:
//
// Version Date By Comments
//--------------------------------------------------------------------
// V3.0 11/4/98 JM original
#include "stdafx.h"
#include "RecentUse.h"
//////////////////////////////////////////////////////////////////////
// CRecentUse
//////////////////////////////////////////////////////////////////////
CRecentUse::CRecentUse(DWORD minExpire /* = 15 */)
{
m_minExpire = minExpire;
}
CRecentUse::~CRecentUse()
{
}
// Start tracking a new value
// SIDE EFFECT: if there are more than 10 values being tracked, see if any of them
// are out of date & get rid of them. This strategy is efficient as long as m_Recent
// never gets very big, which is the expectation in APGTS.
// Will fail silently in the very unlikely case that adding to the map throws an exception.
void CRecentUse::Add(CString str)
{
time_t timeNow;
time (&timeNow);
try
{
m_Recent[str] = timeNow;
}
catch (...)
{
}
// SIDE EFFECT
if (m_Recent.size() > 10)
Flush();
}
// If the input string value has been used within the relevant interval, return true
// and update the time of most recent use.
bool CRecentUse::Validate(CString str)
{
bool bRet = false;
TimeMap::iterator it = m_Recent.find(str);
if ( it != m_Recent.end())
bRet = Validate(it);
return bRet;
}
// If the string value it->first has been used within the relevant interval, return true
// and update the time of most recent use (it->second).
// Before calling this, verify that it is a valid iterator, not m_Recent.end()
// SIDE EFFECT: if it->first hasn't been used within the relevant interval, remove *it
// from m_Recent. This side effect means that in the case of a false return, it no longer
// will point to the same value.
bool CRecentUse::Validate(TimeMap::iterator it)
{
bool bRet = false;
time_t timeNow;
time (&timeNow);
if (timeNow - it->second < m_minExpire * 60 /* secs per min */)
{
bRet = true;
it->second = timeNow;
}
else
// SIDE EFFECT: it's not current, no point to keeping it around.
m_Recent.erase(it);
return bRet;
}
// Get rid of all elements of m_Recent that haven't been used within the relevant interval
void CRecentUse::Flush()
{
TimeMap::iterator it = m_Recent.begin();
while (it != m_Recent.end())
{
if (Validate(it))
++it; // on to the next
else
m_Recent.erase(it);
}
}