/// <summary>
/// Returns a stream which enable storing either a new item or an update for
/// an existing item in the store in the provided <paramref name="category"/>
/// with the provided <paramref name="key"/>.
/// </summary>
/// <param name="category">The category of the item.</param>
/// <param name="key">The key of the item.</param>
/// <returns>A stream which must be used to store the item content.</returns>
public Stream GetItemWriter(string category, string key)
{
if (category == null)
{
throw new ArgumentNullException(nameof(category));
}
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
CheckDisposed();
CheckSealed();
var memoryStream = new MemoryStream();
Interlocked.Increment(ref _openedStreamCount);
return(new StreamWrapper(memoryStream, onDispose: () =>
{
byte[] bytes = memoryStream.ToArray();
_stateStore.AddOrUpdateItem(category, key, bytes);
Interlocked.Decrement(ref _openedStreamCount);
Debug.Assert(Interlocked.CompareExchange(ref _sealed, 0, 0) == 0,
"The state was committed or rollback during the write operation.");
}));
}
private static InMemoryStateStore Load(XDocument doc)
{
var store = doc.Element("Store");
var id = store.Attribute("Id").Value;
var res = new InMemoryStateStore(id);
var categories = store.Elements("Category");
foreach (var category in categories)
{
var categoryName = category.Attribute("Name").Value;
var entries = category.Elements("Entry");
foreach (var entry in entries)
{
var keyName = entry.Attribute("Name").Value;
var base64 = entry.Nodes().OfType <XCData>().Single().Value;
var value = Convert.FromBase64String(base64);
res.AddOrUpdateItem(categoryName, keyName, value);
}
}
return(res);
}