public static void Flush(this HttpRuntimeCacheProvider cacheProvider, Func <String, Boolean> predicate)
{
var cacheFilename = GetCacheFilePath(cacheProvider);
using (var stream = new FileStream(cacheFilename, FileMode.OpenOrCreate, FileAccess.ReadWrite))
using (var writer = new StreamWriter(stream)) {
var prefix = cacheProvider.BuildCacheKey(null);
stream.SetLength(0L);
var entries = HttpRuntime.Cache.OfType <DictionaryEntry>()
.Where(cacheProvider.Hit)
.Where(r => predicate(((String)r.Key).Substring(prefix.Length)));
var json = new JavaScriptSerializer();
foreach (var entry in entries)
{
writer.WriteLine(json.Serialize(entry));
}
writer.Flush();
}
}
public static T Restore <T>(this HttpRuntimeCacheProvider cacheProvider, String key)
{
var cacheFilename = GetCacheFilePath(cacheProvider);
if (!File.Exists(cacheFilename))
{
return(default(T));
}
//{"Key":"HRCP_??","Value":??}
var cacheLineStart = String.Format("{{\"Key\":\"{0}\",\"Value\":", cacheProvider.BuildCacheKey(key));
var cacheCollection = File.ReadLines(cacheFilename);
var cacheLine = cacheCollection.FirstOrDefault(c => c.StartsWith(cacheLineStart));
if (cacheLine == null)
{
return(default(T));
}
cacheLine = cacheLine.Substring(cacheLineStart.Length, cacheLine.Length - cacheLineStart.Length - 1);
var json = new JavaScriptSerializer();
return(json.Deserialize <T>(cacheLine));
}
