/**
* Check all the edges in the ConnectionTable and see if any of them
* need to be pinged or closed.
* This method is connected to the heartbeat event.
*/
virtual protected void CheckEdgesCallback(object node, EventArgs args)
{
DateTime now = DateTime.UtcNow;
//_connection_timeout = ComputeDynamicTimeout();
_connection_timeout = MAX_CONNECTION_TIMEOUT;
/*
* If we haven't heard from any of these people in this time,
* we ping them, and if we don't get a response, we close them
*/
foreach (Connection c in _connection_table)
{
Edge e = c.Edge;
TimeSpan since_last_in = now - e.LastInPacketDateTime;
if ((1 == _send_pings) && (since_last_in > _connection_timeout))
{
object ping_arg = String.Empty;
DateTime start = DateTime.UtcNow;
EventHandler on_close = delegate(object q, EventArgs cargs) {
BCon.Channel qu = (BCon.Channel)q;
if (qu.Count == 0)
{
/* we never got a response! */
if (!e.IsClosed)
{
//We are going to close it after waiting:
ProtocolLog.WriteIf(ProtocolLog.NodeLog, String.Format(
"On an edge timeout({1}), closing connection: {0}",
c, DateTime.UtcNow - start));
//Make sure it is indeed closed.
e.Close();
}
else
{
//The edge was closed somewhere else, so it
//didn't timeout.
}
}
else
{
//We got a response, let's make sure it's not an exception:
bool close = false;
try {
RpcResult r = (RpcResult)qu.Dequeue();
object o = r.Result; //This will throw an exception if there was a problem
if (!o.Equals(ping_arg))
{
//Something is wrong with the other node:
ProtocolLog.WriteIf(ProtocolLog.NodeLog, String.Format(
"Ping({0}) != {1} on {2}", ping_arg, o, c));
close = true;
}
}
catch (Exception x) {
ProtocolLog.WriteIf(ProtocolLog.Exceptions, String.Format(
"Ping on {0}: resulted in: {1}", c, x));
close = true;
}
if (close)
{
e.Close();
}
}
};
BCon.Channel tmp_queue = new BCon.Channel(1);
tmp_queue.CloseEvent += on_close;
//Do the ping
try {
_rpc.Invoke(e, tmp_queue, "sys:link.Ping", ping_arg);
}
catch (EdgeClosedException) {
//Just ignore closed edges, clearly we can't ping them
}
catch (EdgeException x) {
if (!x.IsTransient)
{
//Go ahead and close the Edge
e.Close();
}
}
}
}
foreach (Edge e in _connection_table.GetUnconnectedEdges())
{
if (now - e.LastInPacketDateTime > _unconnected_timeout)
{
if (ProtocolLog.Connections.Enabled)
{
ProtocolLog.Write(ProtocolLog.Connections, String.Format(
"Closed an unconnected edge: {0}", e));
}
e.Close();
}
}
}