public async Task LoadAsync()
{
//wait for the semaphore
await _semaphore.WaitAsync();
try {
//state management
if (State == SnapshotState.Loading)
{
return;
}
State = SnapshotState.Loading;
//load data from the factory
Data = new SnapshotData <TData>(await _dataFactory());
State = SnapshotState.Loaded;
//release the semaphore
_semaphore.Release();
}
catch {
//set state
State = SnapshotState.Failed;
//release the semaphore
_semaphore.Release();
//leak exception to caller
throw;
}
}
public Snapshot(Func <Task <TData> > dataFactory, TData initialData)
{
_dataFactory = dataFactory;
_semaphore = new SemaphoreSlim(1);
State = SnapshotState.Empty;
Data = new SnapshotData <TData>(initialData);
}
