public static async Task SaveStateAsync(IStorage storage, PersistedStateKeys keys, PersistedState newState, PersistedState oldState = null, string eTag = null)
{
// Check for state changes
var save = false;
Dictionary <string, object> changes = new Dictionary <string, object>();
if (oldState != null)
{
if (JsonConvert.SerializeObject(newState.UserState) != JsonConvert.SerializeObject(oldState.UserState))
{
if (eTag != null)
{
newState.UserState[ETAG] = eTag;
}
changes[keys.UserState] = newState.UserState;
save = true;
}
if (JsonConvert.SerializeObject(newState.ConversationState) != JsonConvert.SerializeObject(oldState.ConversationState))
{
if (eTag != null)
{
newState.ConversationState[ETAG] = eTag;
}
changes[keys.ConversationState] = newState.ConversationState;
save = true;
}
}
else
{
if (eTag != null)
{
newState.UserState[ETAG] = eTag;
newState.ConversationState[ETAG] = eTag;
}
changes[keys.UserState] = newState.UserState;
changes[keys.ConversationState] = newState.ConversationState;
save = true;
}
// Save changes
if (save)
{
await storage.WriteAsync(changes).ConfigureAwait(false);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="PersistedState"/> class.
/// </summary>
/// <param name="keys">The persisted keys.</param>
/// <param name="data">The data containing the state values.</param>
public PersistedState(PersistedStateKeys keys, IDictionary <string, object> data)
{
UserState = data.ContainsKey(keys.UserState) ? (IDictionary <string, object>)data[keys.UserState] : new ConcurrentDictionary <string, object>();
ConversationState = data.ContainsKey(keys.ConversationState) ? (IDictionary <string, object>)data[keys.ConversationState] : new ConcurrentDictionary <string, object>();
}
public static async Task <PersistedState> LoadStateAsync(IStorage storage, PersistedStateKeys keys)
{
var data = await storage.ReadAsync(keys.ToArray()).ConfigureAwait(false);
return(new PersistedState(keys, data));
}
