コード例 #1
0
        /// <summary>
        /// Stops active trace:
        /// - Cancels BG polling loop
        /// - Closes DB reader
        /// - Unregisters trace
        /// - Closes DB connection
        /// </summary>
        /// <param name="cancel"></param>
        /// <returns></returns>
        public async Task StopTraceSessionAsync(CancellationToken cancel)
        {
            Log.Debug("Stopping trace session");

            // cancel active readers
            _readerCancel.Cancel();

            try
            {
                await _traceReader.CloseDbReaderAsync(cancel);
            }
            catch
            {
                Log.Warn("Cannot close DB reader");
            }

            cancel.ThrowIfCancellationRequested();

            try
            {
                await _traceReader.UnregisterTraceAsync(cancel);
            }
            catch
            {
                Log.Warn("Cannot unregister DB trace");
            }

            Log.Debug("Terminating connection");
            _connection.Close();
            _connection  = null;
            _traceReader = null;
            Log.Debug("Trace stopped");
        }
コード例 #2
0
        /// <summary>
        /// - Connects to DB
        /// - Registers events
        /// - Opens DB reader
        /// - Starts trace reader BG polling event
        /// </summary>
        public async Task StartTraceSessionAsync(ServerConnection connection, Dictionary <EventClassType, List <EventColumnType> > registeredEvents, CancellationToken cancel)
        {
            Log.Info("Starting trace session");
            try
            {
                _connection = await new DbConnection().GetNewConnectionAsync(connection, cancel);
            }
            catch
            {
                Log.Warn("Error opening connection");
                throw;
            }

            cancel.ThrowIfCancellationRequested();

            try
            {
                _traceReader = new TraceReader(_connection);
                await _traceReader.RegisterTraceAsync(registeredEvents, cancel);
            }
            catch
            {
                Log.Warn("Could not register trace/events. Closing connection.");
                _connection.Dispose();
                _connection  = null;
                _traceReader = null;

                throw;
            }

            cancel.ThrowIfCancellationRequested();

            try
            {
                await _traceReader.OpenDbReaderAsync(cancel);
            }
            catch
            {
                Log.Warn("Could not open DB reader");
                await _traceReader.UnregisterTraceAsync(cancel);

                _connection.Dispose();
                _connection  = null;
                _traceReader = null;

                throw;
            }

            cancel.ThrowIfCancellationRequested();

            try
            {
                Log.Debug("Starting BG thread");
                _readerCancel = new CancellationTokenSource();

                // start background thread (without "await", to keep it running)
                var progress = new Progress <Tuple <ProfilerEventStatus, ProfilerEvent> >(p => OnEvent?.Invoke(p.Item1, p.Item2));
                var _        = _traceReader.BackgroundPollingThreadAsync(_readerCancel.Token, progress);
            }
            catch (Exception ex)
            {
                Log.Error("Error starting BG worker", ex);
                throw;
            }
        }