public async IAsyncEnumerable <MessageContentGrpcModel> GetMessagesFromMessageId(string topicId, long fromMessageId,
int maxMessagesAmount, string reason)
{
var pageId = MessagesContentPagesUtils.GetPageId(fromMessageId);
var maxPageId = pageId.Value + 2;
var messageNo = 0;
while (pageId.Value < maxPageId)
{
var page = await TryGetPageAsync(topicId, pageId, reason);
foreach (var message in page.GetMessages())
{
if (message.MessageId >= fromMessageId)
{
yield return(message);
messageNo++;
}
if (messageNo >= maxMessagesAmount)
{
yield break;
}
}
pageId = new MessagePageId(pageId.Value + 1);
}
}
public async ValueTask <IMessageContentPage> TryGetPageAsync(string topicId, MessagePageId pageId, string reason)
{
var page = _messagesContentCache.TryGetPage(topicId, pageId);
if (page != null)
{
return(page);
}
IMessageContentPage result = null;
await _taskSchedulerByTopic.ExecuteTaskAsync(topicId, pageId, "Getting page: " + reason, async() =>
{
result = await TryGetPageTopicThreadSynchronizedAsync(topicId, pageId);
});
return(result);
}
public async ValueTask <IMessageContentPage> TryGetPageTopicThreadSynchronizedAsync(string topicId,
MessagePageId pageId)
{
var page = _messagesContentCache.TryGetPage(topicId, pageId);
if (page != null)
{
return(page);
}
return(await LoadPageIntoCacheTopicSynchronizedAsync(topicId, pageId));
}
public async Task <IMessageContentPage> LoadPageIntoCacheTopicSynchronizedAsync(string topicId, MessagePageId pageId)
{
var page = _messagesContentCache.TryGetPage(topicId, pageId);
if (page != null)
{
return(page);
}
return(await _restorePageFromBlobOperation.TryRestoreFromCompressedPage(topicId, pageId)
?? await _restorePageFromBlobOperation.TryRestoreFromUncompressedPage(topicId, pageId));
}