/// <summary>
///
/// </summary>
protected virtual void channel_ItemsUpdatedEvent(EventSource source, EventSourceChannel channel, IEnumerable <EventBase> items)
{
if (ItemsUpdatedEvent != null)
{
ItemsUpdatedEvent(source, items);
}
}
/// <summary>
/// Actual updating of items happens here.
/// </summary>
void DoUpdateItems()
{
if (_feed == null)
{
return;
}
List <RssChannel> channels;
lock (this)
{
channels = GeneralHelper.EnumerableToList <RssChannel>(_feed.Channels);
}
foreach (RssChannel channel in channels)
{
// Obtain or create channel.
EventSourceChannel sourceChannel = base.GetChannelByName(channel.Title, true);
sourceChannel.ItemsUpdateEnabled = false;
sourceChannel.Address = channel.Link.ToString();
List <EventBase> newItems = new List <EventBase>();
foreach (RssItem item in channel.Items)
{
RssNewsEvent eventItem = new RssNewsEvent(item);
eventItem.Initialize(sourceChannel);
newItems.Add(eventItem);
}
// Add all by default to the "Default" channel, since RSS feeds never seem to bother with proper inner channels.
sourceChannel.AddItems(newItems);
}
}
/// <summary>
/// On update, update items.
/// </summary>
protected override void OnUpdate()
{
try
{
if (_feed == null)
{
_feed = RssFeed.Read(base.Address);
if (_feed.Channels.Count == 1)
{
// Some feeds have those symbols in their names.
_name = _feed.Channels[0].Title.Replace("\r", "").Replace("\n", "").Trim();
}
else
{
_name = _feed.Url.ToString();
}
List<string> names = new List<string>();
foreach (RssChannel channel in _feed.Channels)
{
names.Add(channel.Title);
}
foreach (string name in names)
{
if (ChannelsNames.Contains(name) == false)
{
EventSourceChannel channel = new EventSourceChannel(name, true);
channel.Initialize(this);
base.AddChannel(channel);
}
}
}
else
{
_feed = RssFeed.Read(_feed);
}
//OperationalStateEnum newState = OperationalStateEnum.Operational;
}
catch (WebException we)
{// Feed not found or some other problem.
SystemMonitor.OperationWarning("Failed to initialize feed [" + Address + ", " + we.Message + "]");
ChangeOperationalState(OperationalStateEnum.NotOperational);
}
catch (Exception ex)
{// RssFeed class launches IOExceptions too, so get safe here.
SystemMonitor.OperationWarning("Failed to initialize feed [" + Address + ", " + ex.Message + "]");
ChangeOperationalState(OperationalStateEnum.NotOperational);
}
DoUpdateItems();
//RaisePersistenceDataUpdatedEvent();
}
/// <summary>
/// On update, update items.
/// </summary>
protected override void OnUpdate()
{
try
{
if (_feed == null)
{
_feed = RssFeed.Read(base.Address);
if (_feed.Channels.Count == 1)
{
// Some feeds have those symbols in their names.
_name = _feed.Channels[0].Title.Replace("\r", "").Replace("\n", "").Trim();
}
else
{
_name = _feed.Url.ToString();
}
List <string> names = new List <string>();
foreach (RssChannel channel in _feed.Channels)
{
names.Add(channel.Title);
}
foreach (string name in names)
{
if (ChannelsNames.Contains(name) == false)
{
EventSourceChannel channel = new EventSourceChannel(name, true);
channel.Initialize(this);
base.AddChannel(channel);
}
}
}
else
{
_feed = RssFeed.Read(_feed);
}
//OperationalStateEnum newState = OperationalStateEnum.Operational;
}
catch (WebException we)
{// Feed not found or some other problem.
SystemMonitor.OperationWarning("Failed to initialize feed [" + Address + ", " + we.Message + "]");
ChangeOperationalState(OperationalStateEnum.NotOperational);
}
catch (Exception ex)
{// RssFeed class launches IOExceptions too, so get safe here.
SystemMonitor.OperationWarning("Failed to initialize feed [" + Address + ", " + ex.Message + "]");
ChangeOperationalState(OperationalStateEnum.NotOperational);
}
DoUpdateItems();
//RaisePersistenceDataUpdatedEvent();
}
/// <summary>
///
/// </summary>
/// <param name="channel"></param>
protected void RemoveChannel(EventSourceChannel channel)
{
lock (_channels)
{
if (_channels.Remove(channel.Name))
{
channel.ItemsAddedEvent -= new EventSourceChannel.ItemsUpdateDelegate(channel_ItemsAddedEvent);
}
}
}
/// <summary>
/// Add a new channel to this source.
/// </summary>
/// <param name="name"></param>
/// <param name="enabled"></param>
protected void AddChannel(EventSourceChannel channel)
{
lock (_channels)
{
_channels[channel.Name] = channel;
}
channel.ItemsAddedEvent += new EventSourceChannel.ItemsUpdateDelegate(channel_ItemsAddedEvent);
channel.ItemsUpdatedEvent += new EventSourceChannel.ItemsUpdateDelegate(channel_ItemsUpdatedEvent);
}
/// <summary>
/// Intercept call to gaether locally items for filtering.
/// </summary>
protected override void channel_ItemsAddedEvent(EventSource source, EventSourceChannel channel, IEnumerable<EventBase> items)
{
foreach (RssNewsEvent item in items)
{
if ((DateTime.Now - item.DateTime) < TimeSpan.FromDays(7)
&& _latestNewsItemsTitles.ContainsKey(item.Title) == false)
{// Gather items from the last 3 days.
lock (this)
{
_latestNewsItemsTitles.Add(item.Title, item);
}
}
}
base.channel_ItemsAddedEvent(source, channel, items);
}
/// <summary>
///
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public EventSourceChannel GetChannelByName(string name, bool create)
{
lock (_channels)
{
if (_channels.ContainsKey(name) == false)
{
if (create)
{
EventSourceChannel channel = new EventSourceChannel(name, true);
channel.Initialize(this);
_channels.Add(name, channel);
}
else
{
return(null);
}
}
return(_channels[name]);
}
}
/// <summary>
/// Result is new items found on page.
/// Page corresponds to a channel.
/// </summary>
/// <param name="uri"></param>
List<EventBase> ProcessPage(EventSourceChannel channel)
{
List<EventBase> result = new List<EventBase>();
HtmlDocument document = GenerateDocument(channel.Address);
if (document == null)
{
return result;
}
foreach (HtmlNode node in document.DocumentNode.SelectNodes("//a[@class]"))
{
if (node.ParentNode.Name == "p" &&
node.ParentNode.Attributes["class"] != null
&& node.ParentNode.Attributes["class"].Value == "summ")
{
string itemTitle = node.ChildNodes[0].InnerText;
lock (this)
{
if (_latestNewsItemsTitles.ContainsKey(itemTitle))
{// News already listed.
continue;
}
RssNewsEvent item = CreateNewsItem(node, true);
if (item != null)
{
_latestNewsItemsTitles.Add(itemTitle, item);
item.Initialize(channel);
result.Add(item);
}
}
}
}
return result;
}
/// <summary>
/// Helper. Not thread safe.
/// </summary>
void AddChannel(string name, string uri)
{
EventSourceChannel channel = new EventSourceChannel(name, true);
channel.Initialize(this);
channel.Address = uri;
base.AddChannel(channel);
}
/// <summary>
/// Initialize item to be part of this channel.
/// </summary>
/// <param name="source"></param>
public void Initialize(EventSourceChannel channel)
{
_channel = channel;
_channelId = channel.Name;
}
/// <summary>
/// Initialize item to be part of this channel.
/// </summary>
/// <param name="source"></param>
public void Initialize(EventSourceChannel channel)
{
_channel = channel;
_channelId = channel.Name;
}
