public override void RunBackgroundTask()
{
// this task only works if the RSS feed is configured to be the datasource.
if (GlossaryPlaceholderData.DataSource == GlossaryPlaceholderData.GlossaryDataSource.RssFeed)
{
string dataCacheKey = GlossaryPlaceholderData.getRssDataPersistentVariableName();
string lastRunCacheKey = dataCacheKey + "_LastRun";
CmsPersistentVariable persistedLastRun = CmsPersistentVariable.Fetch(lastRunCacheKey);
bool doFetch = false;
if (persistedLastRun.Name == "" || persistedLastRun.PersistedValue == null)
{
doFetch = true;
}
if (persistedLastRun.Name != "" && !doFetch)
{
DateTime lastRunTime = (DateTime)persistedLastRun.PersistedValue;
if (lastRunTime < DateTime.Now.AddDays(-1))
{
doFetch = true;
}
}
if (doFetch)
{
FetchAndSaveRemoteRSSGlossaryData();
}
}
} // RunBackgroundTask
} // RunBackgroundTask
public bool FetchAndSaveRemoteRSSGlossaryData()
{
string dataCacheKey = GlossaryPlaceholderData.getRssDataPersistentVariableName();
string lastRunCacheKey = dataCacheKey + "_LastRun";
string rssUrl = GlossaryPlaceholderData.getRssDataSourceUrl();
Rss.RssFeed glossaryRss = Rss.RssFeed.Read(rssUrl);
if (glossaryRss.Channels.Count == 0)
{
// html.Append("<em>Error: could not retrieve Glossary from "+rssUrl+"</em>");
}
else
{
GlossaryData[] items = GlossaryData.FromRSSItems(glossaryRss.Channels[0].Items);
CmsPersistentVariable persistedData = CmsPersistentVariable.Fetch(dataCacheKey);
persistedData.Name = dataCacheKey;
persistedData.PersistedValue = new List <GlossaryData>(items);
bool b = persistedData.SaveToDatabase();
if (b)
{
CmsPersistentVariable persistedLastRun = CmsPersistentVariable.Fetch(lastRunCacheKey);
persistedLastRun.PersistedValue = DateTime.Now;
persistedLastRun.Name = lastRunCacheKey;
return(persistedLastRun.SaveToDatabase());
}
}
return(false);
} // FetchAndSaveRemoteRSSGlossaryData
protected override void Render(HtmlTextWriter writer)
{
StringBuilder html = new StringBuilder();
string swh = "http://www.sadcwaterhub.org/glossary/feed?lang_tid[0]=2";
string url = CmsControlUtils.getControlParameterKeyValue(CmsContext.currentPage, this, "rssurl", swh);
int cacheDuration_hours = CmsControlUtils.getControlParameterKeyValue(CmsContext.currentPage, this, "cacheduration_hours", 12);
System.Web.Caching.Cache Cache = System.Web.Hosting.HostingEnvironment.Cache;
Rss.RssFeed glossaryRss;
// the RSS feed is cached to improve performance.
if (cacheDuration_hours >= 0 && Cache[url] != null)
{
glossaryRss = (Rss.RssFeed)Cache[url];
}
else
{
glossaryRss = Rss.RssFeed.Read(url);
// add it to the cache
if (cacheDuration_hours >= 0)
{
Cache.Insert(url, glossaryRss, null, DateTime.Now.AddHours(cacheDuration_hours), System.Web.Caching.Cache.NoSlidingExpiration);
}
}
if (glossaryRss.Channels.Count == 0)
{
html.Append("<em>Error: could not retrieve Glossary from SADC Water Hub</em>");
}
else
{
GlossaryData[] items = ToGlossaryData(glossaryRss.Channels[0].Items);
GlossaryPlaceholderData phData = new GlossaryPlaceholderData();
phData.SortOrder = GlossaryPlaceholderData.GlossarySortOrder.byWord;
phData.ViewMode = GlossaryPlaceholderData.GlossaryViewMode.PagePerLetter;
string[] charsWithData = getCharsWithData(items);
string letterToDisplay = Glossary.getLetterToDisplay(phData);
if (letterToDisplay != "")
{
items = GlossaryData.getItemsStartingWithChar(items, letterToDisplay[0]);
}
html.Append(Glossary.GetHtmlDisplay(CmsContext.currentPage, items, phData, charsWithData, letterToDisplay));
} // else
writer.Write(html.ToString());
}
