/// <summary>
/// Returns the list of resource references currently registered under the
/// cache entry.
/// </summary>
/// <remarks>
/// Returns the list of resource references currently registered under the
/// cache entry. If the list is empty, it returns an empty collection. The
/// returned collection is unmodifiable and a snapshot of the information at
/// the time of the query. The state may change after this query returns. The
/// caller should handle the situation that some or all of these resource
/// references are no longer relevant.
/// </remarks>
/// <returns>
/// the collection that contains the resource references associated
/// with the resource; or an empty collection if no resource references
/// are registered under this resource
/// </returns>
public override ICollection <SharedCacheResourceReference> GetResourceReferences(string
key)
{
string interned = Intern(key);
lock (interned)
{
SharedCacheResource resource = cachedResources[interned];
if (resource == null)
{
return(Sharpen.Collections.EmptySet());
}
ICollection <SharedCacheResourceReference> refs = new HashSet <SharedCacheResourceReference
>(resource.GetResourceReferences());
return(Sharpen.Collections.UnmodifiableSet(refs));
}
}
/// <summary>Removes the given resource from the store.</summary>
/// <remarks>
/// Removes the given resource from the store. Returns true if the resource is
/// found and removed or if the resource is not found. Returns false if it was
/// unable to remove the resource because the resource reference list was not
/// empty.
/// </remarks>
public override bool RemoveResource(string key)
{
string interned = Intern(key);
lock (interned)
{
SharedCacheResource resource = cachedResources[interned];
if (resource == null)
{
return(true);
}
if (!resource.GetResourceReferences().IsEmpty())
{
return(false);
}
// no users
Sharpen.Collections.Remove(cachedResources, interned);
return(true);
}
}
/// <summary>Removes the provided collection of resource references from the resource.
/// </summary>
/// <remarks>
/// Removes the provided collection of resource references from the resource.
/// If the resource does not exist, nothing will be done.
/// </remarks>
public override void RemoveResourceReferences(string key, ICollection <SharedCacheResourceReference
> refs, bool updateAccessTime)
{
string interned = Intern(key);
lock (interned)
{
SharedCacheResource resource = cachedResources[interned];
if (resource != null)
{
ICollection <SharedCacheResourceReference> resourceRefs = resource.GetResourceReferences
();
resourceRefs.RemoveAll(refs);
if (updateAccessTime)
{
resource.UpdateAccessTime();
}
}
}
}
/// <summary>Removes the provided resource reference from the resource.</summary>
/// <remarks>
/// Removes the provided resource reference from the resource. If the resource
/// does not exist, nothing will be done.
/// </remarks>
public override bool RemoveResourceReference(string key, SharedCacheResourceReference
@ref, bool updateAccessTime)
{
string interned = Intern(key);
lock (interned)
{
bool removed = false;
SharedCacheResource resource = cachedResources[interned];
if (resource != null)
{
ICollection <SharedCacheResourceReference> resourceRefs = resource.GetResourceReferences
();
removed = resourceRefs.Remove(@ref);
if (updateAccessTime)
{
resource.UpdateAccessTime();
}
}
return(removed);
}
}
