public async Task LoadSavedFeeds()
{
OBDebug.Log("Loading saved feeds (async)");
ObservableCollection <Feed> feeds = null;
try {
// Will throw an exception if the object doesn't exist - I really do hate exceptions
feeds = await BlobCache.LocalMachine.GetObject <ObservableCollection <Feed> >(Constants.Keys.SavedFeeds);
} catch (Exception e) {
OBDebug.Log(e);
}
if (feeds != null)
{
// Got our previous list of feeds
OBDebug.Log("Got our last cache of feeds");
foreach (var feed in feeds)
{
MasterFeeds.Add(feed);
}
}
else
{
// No existing cached feed list - make a new one
OBDebug.Log("Making a new set of feeds");
MasterFeeds.Add(new Feed {
Url = Constants.Urls.SkySportsFeed
});
MasterFeeds.Add(new Feed {
Url = Constants.Urls.TechRadarFeed
});
}
}
// Refactored out for code duplication's sake
void FireActionWithNamedProperty <T>(string propertyName, Action <T> onPropertyChanged)
{
try {
onPropertyChanged((T)GetType().GetRuntimeProperty(propertyName).GetValue(this));
} catch (Exception ex) {
OBDebug.Log("You dun goofed. Either your property name wasn't correct, or the specified type was incorrect.", propertyName, typeof(T), ex);
throw ex;
}
}
FeedManager()
{
// Set up Akavache
try {
BlobCache.ApplicationName = Constants.Keys.ApplicationName;
} catch (Exception e) {
OBDebug.Log("NUnit hates Akavache", e);
}
// Load the saved feeds
MasterFeeds = new ObservableCollection <Feed>();
Task.Run(async() => await LoadSavedFeeds());
}
public static async Task <XDocument> GetParsedRssXml(string url)
{
// If we're within 15 minutes, grab a cached copy of the url response
string rawXml = string.Empty;
try {
rawXml = await BlobCache.LocalMachine.GetOrFetchObject(url, async() => await DownloadStringAtUrl(url), DateTimeOffset.UtcNow.AddMinutes(15));
} catch (Exception e) {
OBDebug.Log("Exception while using akavache", "Attempting manual download instead", e);
rawXml = await DownloadStringAtUrl(url);
}
OBDebug.Log("Got raw xml response", url);
return(XDocument.Parse(rawXml));
}
public async Task UpdateFeed(Feed feed)
{
OBDebug.Log("Updating feed (async)", feed.Url);
feed.Items.Clear();
var xmlDocument = await GetParsedRssXml(feed.Url);
foreach (var item in ParseFeed(xmlDocument))
{
feed.Items.Add(item);
}
OBDebug.Log("Invoking OnFeedUpdated", feed.Url, feed.Items.Count);
if (OnFeedUpdated != null)
{
OnFeedUpdated(this, feed);
}
}
public void UpdateFeedInBackground(Feed feed)
{
OBDebug.Log("Scheduling background feed update", feed.Url);
Task.Run(async() => await UpdateFeed(feed));
}
public static async Task <string> DownloadStringAtUrl(string url)
{
OBDebug.Log("Downloading string at url", url);
return(await HttpClient.GetStringAsync(url));
}
