/// <summary>
/// The get short url.
/// </summary>
/// <param name="url">The url.</param>
/// <param name="provider">The provider.</param>
/// <returns>
/// The <see cref="string" />.
/// </returns>
private string GetShortUrl(string url, IUrlShortenerProvider provider)
{
string shortUrl;
string key = this.CreateKey(url, provider);
if (this.cache.Contains(key))
{
shortUrl = this.cache[key] as string;
}
else
{
shortUrl = provider.Shorten(url);
var item = new CacheItem(key, shortUrl);
var policy = new CacheItemPolicy() { SlidingExpiration = TimeSpan.FromDays(1d) };
this.cache.Add(item, policy);
}
return shortUrl;
}
/// <summary>
/// Creates the key used to cache a result from a provider and a url.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="provider">The provider.</param>
/// <returns></returns>
private string CreateKey(string url, IUrlShortenerProvider provider)
{
return "{0}:{1}".FormatWith(url, provider.Trigger);
}
