public int StartDownload(string address)
{
// put a record in the database.
int id;
using (IDownloadItemRepository repository = createRepository())
{
var item = new DownloadItem()
{
Address = address,
Status = DownloadStatus.Requested
};
repository.Add(item);
repository.SaveChanges();
// get the database generated id.
id = item.Id;
}
eventBus.Notify(this, EventBusToken.DownlaodRequested);
var channelFactory = new ChannelFactory <IDownloadService>("DLS");
var downloadService = channelFactory.CreateChannel();
using (downloadService as IDisposable)
downloadService.Download(id);
return(id);
}
public void Download(int id)
{
using (IDownloadItemRepository repository = createRepository())
{
var item = repository.Get(id);
item.Status = DownloadStatus.Delegated;
repository.SaveChanges();
}
eventBus.Notify(this, EventBusToken.DownloadedDelegated);
ThreadPool.QueueUserWorkItem(ProcessQueueItem, id);
}
private async void ProcessQueueItem(object status)
{
var id = (int)status;
string address;
using (IDownloadItemRepository repository = createRepository())
{
var item = repository.Get(id);
item.Status = DownloadStatus.Downloading;
address = item.Address;
repository.SaveChanges();
}
eventBus.Notify(this, EventBusToken.DownloadBegin);
try
{
string value = await DownloadFile(address);
using (IDownloadItemRepository repository = createRepository())
{
var item = repository.Get(id);
item.Html = value;
item.Status = DownloadStatus.Downloaded;
repository.SaveChanges();
}
eventBus.Notify(this, EventBusToken.DownloadComplete);
}
catch (Exception e)
{
using (IDownloadItemRepository repository = createRepository())
{
var item = repository.Get(id);
item.Status = DownloadStatus.Errored;
repository.SaveChanges();
}
eventBus.Notify(this, EventBusToken.DownloadErrored);
}
}
public void Download(int id)
{
string address;
using (IDownloadItemRepository repository = createRepository())
{
var item = repository.Get(id);
item.Status = DownloadStatus.Downloading;
address = item.Address;
repository.SaveChanges();
}
eventBus.Notify(this, EventBusToken.DownloadBegin);
string value;
if (DownloadFile(address, out value))
{
using (IDownloadItemRepository repository = createRepository())
{
var item = repository.Get(id);
item.Html = value;
item.Status = DownloadStatus.Downloaded;
repository.SaveChanges();
}
eventBus.Notify(this, EventBusToken.DownloadComplete);
}
else
{
using (IDownloadItemRepository repository = createRepository())
{
var item = repository.Get(id);
item.Status = DownloadStatus.Errored;
repository.SaveChanges();
}
eventBus.Notify(this, EventBusToken.DownloadErrored);
}
}