/// <summary>
/// Initializes the control with a crawler object.
/// </summary>
/// <param name="crawler">The crawler object.</param>
public void Initialize(Crawler crawler)
{
// Save the parameters.
this.crawler = crawler;
this.request = new YouTubeRequestFeed<Video>(this.crawler.YouTube.Settings);
// Enable the control
this.Enabled = true;
}
// Public methods.
/// <summary>
/// Initializes the control with a crawler object.
/// </summary>
/// <param name="crawler">The crawler object.</param>
public void Initialize(Crawler crawler)
{
// Save the parameters.
this.crawler = crawler;
this.request = new YouTubeRequestFeed<Video>(this.crawler.YouTube.Settings);
// Enable the control.
this.Enabled = true;
// Update the categories.
this.OnUpdateCategories(this, EventArgs.Empty);
}
/// <summary>
/// Initializes the control with a crawler object.
/// </summary>
/// <param name="crawler">The crawler object.</param>
/// <param name="delegateFeed">The feed event handler.</param>
/// <param name="idName">The ID name.</param>
/// <param name="feedName">The feed name.</param>
/// <param name="objectName">The object name.</param>
/// <param name="logSource">The log source.</param>
public void Initialize(Crawler crawler, VideosFeedEventHandler delegateFeed, string idName, string feedName, string objectName, string logSource)
{
// Save the parameters.
this.crawler = crawler;
this.delegateFeed = delegateFeed;
this.labelId.Text = idName;
this.feedName = feedName;
this.objectName = objectName;
this.logSource = logSource;
this.request = new YouTubeRequestFeed<Video>(this.crawler.YouTube.Settings);
// Enable the control
this.Enabled = true;
}
// Private methods.
/// <summary>
/// Crawls the feed at the specified parameters.
/// </summary>
/// <param name="asyncResult">The asynchronous result.</param>
/// <param name="feedId">The feed.</param>
/// <param name="timeId">The time.</param>
/// <param name="category">The category.</param>
/// <param name="regionId">The region.</param>
/// <param name="obj">The standard feed object.</param>
/// <returns>The crawl result.</returns>
private CrawlResult CrawlFeed(
SpiderAsyncResult asyncResult,
YouTubeStandardFeed feedId,
YouTubeTimeId timeId,
string category,
string regionId,
ref DbObjectStandardFeed obj)
{
// If the asynchronousn operation has been canceled, do nothing.
if (asyncResult.IsCanceled) return CrawlResult.Canceled;
// Compute the feed key.
string key = this.EncodeFeedKey(feedId, timeId, category, regionId);
// Compute the feed URI starting at index 1 and ask for 1 result.
Uri uri = YouTubeUri.GetStandardFeed(feedId, regionId, category, timeId, 1, 1);
// Create a new video request.
YouTubeRequestFeed<Video> request = new YouTubeRequestFeed<Video>(this.crawler.YouTube.Settings);
// Set the feed URL.
obj.Url = uri.AbsoluteUri;
try
{
// Begin an asynchronous request for the standard feed.
AsyncWebResult result = request.Begin(uri, (AsyncWebResult webResult) => { }) as AsyncWebResult;
// Add the result of the web operation to the collection of web requests.
AsyncWebOperation operation = asyncResult.AddAsyncWeb(request, result);
// Wait for the asynchronous operation to complete.
result.AsyncWaitHandle.WaitOne();
// Remove the result of the web operation from the collection of web requests.
asyncResult.RemoveAsyncWeb(operation);
// Complete the request and get the video feed.
Feed<Video> feed = request.End(result);
// If the operation completed successfully, set the browsable to true.
obj.Browsable = true;
// Set the response HTTP code.
obj.HttpCode = (int)(result as AsyncWebResult).Response.StatusCode;
// Return the result.
return (feed.FailuresAtom.Count == 0) && (feed.FailuresEntry.Count == 0) ? CrawlResult.Success : CrawlResult.Warning;
}
catch (WebException exception)
{
if (exception.Status == WebExceptionStatus.RequestCanceled)
{
return CrawlResult.Canceled;
}
else
{
// If the operation failed with a web exception, set the browsable to false.
obj.Browsable = false;
// Set the response HTTP code.
obj.HttpCode = (int)(exception.Response as HttpWebResponse).StatusCode;
// Return the result.
return CrawlResult.Fail;
}
}
catch (Exception)
{
// If the operation failed with a web exception, set the browsable to false.
obj.Browsable = false;
// Set the response HTTP code to null.
obj.HttpCode = null;
// Return the result.
return CrawlResult.Fail;
}
}
