private void OnOnlineEvent(object sender, AnnouncementEventArgs e)
{
_availableEndpoints.Add(e.EndpointDiscoveryMetadata.Address);
AvailableEndpointsChanged?.Invoke(this, new EventArgs());
}
public void FindAvailableServices()
{
try
{
IsSearchingForEndPoints = true;
AvailableEndpointsChanged?.Invoke(this, new EventArgs());
var discoveryClient = new DiscoveryClient(new UdpDiscoveryEndpoint());
var findResponse = discoveryClient.Find(new FindCriteria(typeof(IDataServiceServer))
{
Duration = TimeSpan.FromSeconds(2)
});
foreach (var endPoints in findResponse.Endpoints)
{
var found = false;
foreach (var knownEndpoint in _availableEndpoints)
{
if (knownEndpoint.Uri == endPoints.Address.Uri)
{
found = true;
break;
}
}
if (!found)
{
lock (_availableEndpoints)
{
_availableEndpoints.Add(endPoints.Address);
AvailableEndpointsChanged?.Invoke(this, new EventArgs());
}
}
}
foreach (var knownEndpoint in _availableEndpoints.ToList())
{
var found = false;
foreach (var endPoints in findResponse.Endpoints)
{
if (knownEndpoint.Uri == endPoints.Address.Uri)
{
found = true;
break;
}
}
if (!found)
{
lock (_availableEndpoints)
{
_availableEndpoints.Remove(knownEndpoint);
AvailableEndpointsChanged?.Invoke(this, new EventArgs());
}
}
}
}
finally
{
IsSearchingForEndPoints = false;
AvailableEndpointsChanged?.Invoke(this, new EventArgs());
}
}
public void Start()
{
lock (_monitorLock)
{
if (_running)
{
return;
}
_running = true;
_monitor = Task.Run(() => {
while (_running)
{
foreach (var client in _clients)
{
if (_closedStates.Contains(client.State))
{
try
{
//Check if we think we are connected by the connection state is broken
if (IsConnected)
{
client.Close();
IsConnected = false;
}
if (_availableEndpoints.Count > 0)
{
if (_connection == null)
{
_connection = _availableEndpoints.FirstOrDefault()?.Uri;
}
var connectionToAttempt = FindEndpoint(_connection);
if (connectionToAttempt is null)
{
//The connection doesn't exist.
_connection = null;
}
if (connectionToAttempt is object)
{
try
{
client.Open(connectionToAttempt);
IsConnected = true;
}
catch (TimeoutException)
{
//Ignore and try again on the next pass
IsConnected = false;
}
catch (CommunicationException)
{
//Looks like the server is dead. Remove from the available list.
_availableEndpoints.Remove(connectionToAttempt);
AvailableEndpointsChanged?.Invoke(this, new EventArgs());
IsConnected = false;
}
catch (Exception)
{
IsConnected = false;
}
}
}
}
catch
{
//Sink
}
}
}
_resetEvent.WaitOne(1000);
}
});
}
}