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