CaSession* CaSessionManager::SearchSession(CaSession* pInfo)
{
CaSession* pObj = NULL;
int i, nAvail = -1;
for (i=0; i<m_nMaxSession; i++)
{
pObj = m_listObject[i];
if (!pObj && nAvail == -1)
{
nAvail = i;
}
if (pObj && pObj->IsReleased() && (*pObj == *pInfo))
return pObj;
}
//
// Create a new session:
// Find the first released session and disconnect it.
for (i=0; i<m_nMaxSession && nAvail ==-1; i++)
{
pObj = m_listObject[i];
if (!pObj)
{
nAvail = i;
break;
}
if (pObj && pObj->IsReleased())
{
//
// Disconnected the unused session to free the slot:
nAvail = i;
pObj->Disconnect();
delete pObj;
m_listObject[i] = NULL;
break;
}
}
if (nAvail != -1)
{
try
{
pObj = new CaSession (*pInfo);
pObj->SetSessionNum (nAvail + m_nSessionStart);
pObj->Connect();
m_listObject[nAvail] = pObj;
return pObj;
}
catch(CeSqlException e)
{
if (pObj)
delete pObj;
throw e;
}
}
return NULL;
}
CaSession* CaSessionManager::GetSession(CaSession* pInfo)
{
//
// First of all, check if the session number exceeds the limit.
// If so, try to destroy those extra sessions:
CaSession* pObj = NULL;
int i, nSize = m_listObject.GetSize();
if (nSize > m_nMaxSession)
{
for (i=(nSize -1); i>=m_nMaxSession; i--)
{
pObj = m_listObject[i];
if (pObj && pObj->IsReleased())
{
m_listObject[i] = NULL;
pObj->Disconnect();
delete pObj;
pObj = NULL;
}
}
}
//
// Search if there is an available session:
pObj = SearchSession(pInfo);
if (pObj)
{
if (pObj->IsConnected())
pObj->Activate();
else
pObj->Connect();
return pObj;
}
else
{
//
// No session available in the cache and there is no more entry for the new session !
// All session are used!
int nExtra = nSize;
for (i = m_nMaxSession; i < nSize; i++)
{
pObj = m_listObject[i];
if (!pObj)
{
nExtra = i;
break;
}
}
pObj = new CaSession (*pInfo);
if (nExtra >= nSize)
{
nExtra = m_listObject.Add(pObj);
pObj->SetSessionNum (nExtra + m_nSessionStart);
}
else
{
pObj->SetSessionNum (nExtra + m_nSessionStart);
m_listObject.SetAt(nExtra, pObj);
}
pObj->Connect();
return pObj;
}
return NULL;
}
