private async Task <string> InitConnectionAsync()
{
if (_connection == null)
{
using (await _lockInit.LockAsync())
{
if (_connection == null)
{
if (_options.SignalRHubUrl != null)
{
_connection = new HubConnectionBuilder()
.WithUrl(_options.SignalRHubUrl)
.Build();
_notifier = new HubCallBackNotifier(_connection);
_connection.On <string, string>("Callback", HubConnection_Callback);
}
}
}
}
#if NETCOREAPP2_1
try
{
await _connection.StartAsync();
_connectionId = await _connection.InvokeAsync <string>("GetConnectionId");
return(_connectionId);
}
catch (Exception e)
{
_logger.LogWarning(e, "_connection.StartAsync() failed.");
}
#else
// ReSharper disable once PossibleNullReferenceException
if (_connection.State == HubConnectionState.Disconnected)
{
using (await _lockInit.LockAsync())
{
if (_connection.State == HubConnectionState.Disconnected)
{
try
{
await _connection.StartAsync();
_connectionId = await _connection.InvokeAsync <string>("GetConnectionId");
return(_connectionId);
}
catch (Exception e)
{
_logger.LogWarning(e, "_connection.StartAsync() failed.");
}
}
}
}
#endif
return(_connectionId);
}
public HttpClientOnceApiConvert(string apiUrl, string connectionId, HubCallBackNotifier notifier, int timeoutInterval)
{
_apiUrl = apiUrl;
_connectionId = connectionId;
_notifier = notifier;
_timeoutInterval = timeoutInterval + 1000 * 5;
if (_notifier != null)
{
_notifier.Callback += Notifier_Callback;
}
}