private static async Task <List <Guid> > GetOldGetMsgIds(GetOldMessagesInput input,
IReliableDictionary2 <Guid, List <Guid> > indexDict, ITransaction tx)
{
if (await indexDict.ContainsKeyAsync(tx, input.Id))
{
var lstMessageIndex = (await indexDict.TryGetValueAsync(tx, input.Id)).Value;
var oldestMsgIndex = lstMessageIndex.IndexOf(input.OldestMsgId);
if (oldestMsgIndex == 0)
{
return(null);
}
var endIndex = oldestMsgIndex - 1;
var startIndex = oldestMsgIndex - MaxMessageAmount;
var amount = MaxMessageAmount;
if (startIndex < 0)
{
startIndex = 0;
amount = endIndex - startIndex + 1;
}
return(lstMessageIndex.GetRange(startIndex, amount));
}
return(null);
}
public async Task <List <ConversationMsg> > GetOldMessagesAsync(GetOldMessagesInput input)
{
if (input.Id == Guid.Empty)
{
throw new ArgumentException("ConversationId is empty", nameof(input.Id));
}
if (input.OldestMsgId == Guid.Empty)
{
throw new ArgumentException("OldestMsgId is empty", nameof(input.OldestMsgId));
}
_logger.Debug("GetOldMessagesAsync, conversationId is {id}", input.Id);
var result = new List <ConversationMsg>();
var token = CancellationToken.None;
var indexDict = await Service.GetMessageIndexDictByIdAsync(StateManager, input.Id);
var listDicts = await Service.GetAllMessageListDictsAsync(StateManager);
using (var tx = StateManager.CreateTransaction())
{
var willOldGetMsgIds = await GetOldGetMsgIds(input, indexDict, tx);
if (willOldGetMsgIds == null)
{
return(new List <ConversationMsg>());
}
foreach (var listDict in listDicts)
{
result.AddRange(await listDict.GetAllByIdsAsync(tx, willOldGetMsgIds, token));
}
}
_logger.Debug("GetOldMessagesAsync, msg count is {count}", result.Count);
return(result);
}