/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="context">The <see cref="SimpleMessageBusFileProcessorFactoryContext"/> to use.</param>
public SimpleMessageBusFileProcessor(SimpleMessageBusFileProcessorFactoryContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
_options = context.Options;
_attribute = context.Attribute;
_executor = context.Executor;
_logger = context.Logger;
//RWM: Use reflection because _attribute.GetRootPath() is internal.
var dynMethod = _attribute.GetType().GetMethod("GetRootPath", BindingFlags.NonPublic | BindingFlags.Instance);
var attributePath = dynMethod.Invoke(_attribute, null);
_filePath = Path.Combine(_options.RootFolder, attributePath.ToString());
var settings = new JsonSerializerSettings
{
DateFormatHandling = DateFormatHandling.IsoDateFormat,
};
_serializer = JsonSerializer.Create(settings);
}
public async Task StartAsync(CancellationToken cancellationToken)
{
ThrowIfDisposed();
if (_watcher != null && _watcher.EnableRaisingEvents)
{
throw new InvalidOperationException("The listener has already been started.");
}
CreateFileWatcher();
var context = new SimpleMessageBusFileProcessorFactoryContext(_options.Value, _attribute, _triggerExecutor, _logger);
_processor = _fileProcessorFactory.CreateFileProcessor(context);
var options = new ExecutionDataflowBlockOptions
{
BoundedCapacity = _processor.MaxQueueSize,
MaxDegreeOfParallelism = _processor.MaxDegreeOfParallelism,
};
_workQueue = new ActionBlock <FileSystemEventArgs>(async(e) => await ProcessWorkItem(e), options);
// on startup, process any preexisting files that haven't been processed yet
ProcessFiles();
// Create a timer to cleanup processed files.
// The timer doesn't auto-reset. It resets itself as files
// are completed.
// We start the timer on startup so we have at least one
// cleanup pass
_cleanupTimer = new System.Timers.Timer()
{
AutoReset = false,
Interval = _rand.Next(5 * 1000, 8 * 1000)
};
_cleanupTimer.Elapsed += OnCleanupTimer;
_cleanupTimer.Start();
await Task.FromResult <bool>(true);
}