/// <inheritdoc />
protected override Stream CurrentOpen(PathDefinition definition, string virtualPath)
{
bool isValidControlPresentationPath;
ControlPresentation controlPresentation = this.GetControlPresentation(definition, virtualPath, out isValidControlPresentationPath);
if (controlPresentation != null && !controlPresentation.Data.IsNullOrEmpty())
{
var bytes = RouteHelper.GetContentWithPreamble(controlPresentation.Data);
return(new MemoryStream(bytes));
}
throw new ArgumentException("Could not find resource at " + virtualPath + " in the database.");
}
/// <inheritdoc />
protected override System.Web.Caching.CacheDependency GetCurrentCacheDependency(PathDefinition definition, string virtualPath, IEnumerable virtualPathDependencies, DateTime utcStart)
{
bool isValidControlPresentationPath;
ControlPresentation controlPresentation = this.GetControlPresentation(definition, virtualPath, out isValidControlPresentationPath);
if (!isValidControlPresentationPath)
{
// Return null for virtual paths that are not ControlPresentation paths since they do not depend on Control Presentations.
return(null);
}
if (controlPresentation != null)
{
return(new ControlPresentationCacheDependency(controlPresentation.Id.ToString()));
}
// Change to any ControlPresentation record will invalidate the cache for this virtual path.
return(new ControlPresentationCacheDependency(typeof(ControlPresentation)));
}
/// <inheritdoc />
protected override bool CurrentExists(PathDefinition definition, string virtualPath)
{
var cacheManager = this.GetCacheManager();
var key = this.GetExistsCacheKey(definition, virtualPath);
bool?result = cacheManager[key] as bool?;
if (result == null)
{
lock (this.existsLock)
{
result = cacheManager[key] as bool?;
if (result == null)
{
bool isValidControlPresentationPath;
ControlPresentation controlPresentation = this.GetControlPresentation(definition, virtualPath, out isValidControlPresentationPath);
result = controlPresentation != null && !controlPresentation.Data.IsNullOrEmpty();
cacheManager.Add(key, result, Microsoft.Practices.EnterpriseLibrary.Caching.CacheItemPriority.Normal, null, this.GetControlPresentationsCacheExpirations());
}
}
}
return(result.Value);
}