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POHold timer type thread
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copied!<p>im having difficulties figuring this out for myself hence asking here. i have an application which installs a client on a remote machine and the client reports back through a socket.</p> <p>im trying to create a hold timer. which means the client will send a hello message every 1 minute to the server.. if the server doesnt get a hello packet from the client within the hold timer the client is removed. i can do it fine with one client... but for multiple i cannot figure it out. i was thinking to create a thread foreach new client that connected to the server. and then inside that thread start a hold timer.. but how do i distinguish clients from one another with the threads and how do i reset the hold timer IF a hello packet is recieved from a client.</p> <p>i thought of creating a new thread for every hello packet and stopping the old one. but i dont know how cpu intensive this will be</p> <p>if you dont understand my question, please say so and ill try to explain whatever you dont understand.</p> <p>which solution is better? Solution A) starting a new thread and stopping the old thread everytime a hello packet arrives? (every 40 secs) - from 100 clients</p> <p>Solution B) insert much better more scalable solution here.</p> <p>Solution C) can i access a timer inside a thread i create dynamically? - i have unique threadnames on all dynamically created threads.</p> <pre><code>public void _clientholdtimer() { holdtimer = new Timer(); holdtimer.Interval = SECtoMS(Settings.Default.Hold); holdtimer.Elapsed += holdtimer_Elapsed; } </code></pre> <p>and reset it when i recieve a hello packet from client with same name as thread?</p> <p>Solution D) store the timers in a dictionary public Dictionary timersDict = new Dictionary(); and the loop find the reference in the dict on hello packet recieved reset that timer.?</p> <pre><code>foreach(var item in timersDict) { if(item.Key == stripip(client.RemoteEndPoint.ToString())) TimerReset(item.Value); } </code></pre> <p><strong>SOLUTION</strong></p> <p>Setup up the remote host application, to send a "hello" message to the Server every 3 seconds. Create a timer on the server with an elapsed event hit every 1 sec. setup a static value to hold an int which determines, how long before I consider the remote machine dead, I chose 9 seconds.</p> <p>when the server receives a hello message it stores the timestamp in a list among with the ip address of the client.</p> <p>on the timer_elapsed event</p> <pre><code>void holdtimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) { try { if (server.Clients.GetAllItems().Count != 0) { foreach (IScsServerClient _client in server.Clients.GetAllItems()) { string ipaddr = stripip(_client.RemoteEndPoint.ToString()); bool containsentry = _clientlist.Any(item => item.ipadress == ipaddr); if (containsentry) { foreach (Scsserverclient entry in _clientlist.Where(entry => entry.ipadress == ipaddr)) { if ((DateTime.Now - TimeSpan.FromSeconds(Settings.Default.Hold)) > entry.lasthello && entry.isConnect != "Disconnected") { entry.client.Disconnect(); } } } } } } catch (Exception ex) { } } </code></pre> <p>basically i run through a list of connected clients and if the last received hello message is older than 9 seconds, i consider to client to disconnected.</p>

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