public static async Task <IComposedObject <T> > LookupOrRetrieveAsync <T>(
DbRef reference,
[NotNull] ICacheClient redis,
[NotNull] Func <DbRef, CancellationToken, Task <T> > retrieveFunction,
CancellationToken cancellationToken) where T : ObjectBase
{
if (reference.Equals(DbRef.Ambiguous) || reference.Equals(DbRef.FailedMatch) ||
reference.Equals(DbRef.Nothing))
{
return(null);
}
if (redis == null)
{
throw new ArgumentNullException(nameof(redis));
}
if (retrieveFunction == null)
{
throw new ArgumentNullException(nameof(retrieveFunction));
}
if (reference.Equals(DbRef.Nothing))
{
return(null);
}
if (Cache.Contains(reference))
{
return((IComposedObject <T>)Cache.Get(reference));
}
var obj = await retrieveFunction.Invoke(reference, cancellationToken);
if (obj == null)
{
return(null);
}
var composition = await ComposedObject <T> .CreateAsync(redis, obj, cancellationToken);
if (composition.Item1)
{
// The composition was perfect! No unresolved references, so cache it as-is.
Cache.Add(reference, composition.Item2, Policy);
}
return(composition.Item2);
}
public static async Task <IComposedObject <T> > UpdateAsync <T>(
DbRef reference,
[NotNull] ICacheClient redis,
[NotNull] T updatedDataObject,
CancellationToken cancellationToken)
where T : ObjectBase
{
if (Cache.Contains(reference))
{
Cache.Remove(reference);
}
var composition = await ComposedObject <T> .CreateAsync(redis, updatedDataObject, cancellationToken);
if (composition.Item1)
{
// The composition was perfect! No unresolved references, so cache it as-is.
Cache.Add(reference, composition.Item2, Policy);
}
return(composition.Item2);
}
