internal void heartbeat()
{
Dictionary<string, List<AbstractConnection>> cxnsToRemove = new Dictionary<string, List<AbstractConnection>>();
foreach (string site in _connections.Keys)
{
foreach (AbstractConnection cxn in _connections[site])
{
if (DateTime.Now.Subtract(cxn.LastQueryTimestamp).Seconds > _cxnRefreshTime)
{
try
{
VistaToolsDao dao = new VistaToolsDao(cxn);
dao.getTimestamp();
}
catch (Exception)
{
if (!cxnsToRemove.ContainsKey(site))
{
cxnsToRemove.Add(site, new List<AbstractConnection>());
}
cxnsToRemove[site].Add(cxn);
}
}
}
}
if (cxnsToRemove.Count > 0)
{
foreach (string site in cxnsToRemove.Keys)
{
foreach (AbstractConnection cxn in cxnsToRemove[site])
{
_connections[site].Remove(cxn);
_currentActiveConnections--;
}
}
}
}
/// <summary>
/// This function should locate a connection marked as available, verify the connection
/// is still active (using a simple getTimestamp query), re-allocate any encountered failed
/// connections out of process, and return the first connection that is available and connected
/// </summary>
/// <param name="siteId"></param>
/// <returns></returns>
internal AbstractConnection getAvailableConnection(string siteId)
{
lock (_connections)
{
if (_connections.ContainsKey(siteId) && _connections[siteId].Count > 0)
{
foreach (AbstractConnection cxn in _connections[siteId])
{
if (cxn.IsAvailable)
{
VistaToolsDao dao = new VistaToolsDao(cxn);
try
{
dao.getTimestamp();
cxn.IsAvailable = false;
return cxn;
}
catch (Exception)
{
_currentActiveConnections--;
cxn.IsAvailable = false;
reallocateConnection(cxn);
}
}
}
}
}
return null;
}