T IPayloadCache.GetOrAddPayload <T>(PayloadFactory <T> payloadFactory)
{
try
{
IPayloadValue <T> payload = null;
IPayloadCollection currentCollection;
do
{
T existingValue;
if (_collection.TryGetPayload(out existingValue))
{
return(existingValue);
}
IPayloadValue <T> contextProperty = payload ?? (payload = new PayloadValue <T>(payloadFactory()));
currentCollection = Volatile.Read(ref _collection);
Interlocked.CompareExchange(ref _collection, currentCollection.Add(contextProperty), currentCollection);
}while (currentCollection == Volatile.Read(ref _collection));
return(payload.Value);
}
catch (Exception exception)
{
throw new PayloadFactoryException($"The payload factory faulted: {TypeCache<T>.ShortName}", exception);
}
}
T IPayloadCache.AddOrUpdatePayload <T>(PayloadFactory <T> addFactory, UpdatePayloadFactory <T> updateFactory)
{
try
{
T previousValue = null;
IPayloadValue <T> context = null;
IPayloadCollection currentCollection;
do
{
if (_collection.TryGetPayload(out T existingValue))
{
if (context == null || previousValue != existingValue)
{
context = new PayloadValue <T>(updateFactory(existingValue));
}
previousValue = existingValue;
currentCollection = Volatile.Read(ref _collection);
Interlocked.CompareExchange(ref _collection, currentCollection.Add(context), currentCollection);
}
else
{
if (context == null)
{
context = new PayloadValue <T>(addFactory());
}
currentCollection = Volatile.Read(ref _collection);
Interlocked.CompareExchange(ref _collection, currentCollection.Add(context), currentCollection);
}
}while (currentCollection == Volatile.Read(ref _collection));
return(context.Value);
}
catch (Exception exception)
{
throw new PayloadFactoryException($"The payload factory faulted: {TypeCache<T>.ShortName}", exception);
}
}