/// <summary>
/// Initialises a new instance of the <see cref="AsyncRequest"/> class.
/// </summary>
/// <param name="service">The service that performs requests.</param>
/// <param name="trackingUrl">The url used to make progress requests.</param>
/// <param name="tracking">The tracking information from the initial request.</param>
public AsyncRequest(ISDataService service, string trackingUrl, Tracking tracking)
{
Guard.ArgumentNotNull(service, "service");
Guard.ArgumentNotNull(trackingUrl, "trackingUrl");
Guard.ArgumentNotNull(tracking, "tracking");
_service = service;
_trackingUrl = trackingUrl;
_tracking = tracking;
}
/// <summary>
/// Makes a progress update request and refreshes the various progress properties.
/// If the process has completed on the server then a <see cref="ISyndicationResource"/>
/// result will be returned. Otherwise a null reference is returned.
/// </summary>
public ISyndicationResource Refresh()
{
var content = Service.Read(_trackingUrl);
var tracking = content as Tracking;
if (tracking != null)
{
_tracking = tracking;
return null;
}
Service.Delete(_trackingUrl);
return (ISyndicationResource) content;
}