public async Task <IMessageContentPage> TryRestoreFromCompressedPage(string topicId, MessagePageId pageId)
{
var resultFromCache = _messagesContentCache.TryGetPage(topicId, pageId);
if (resultFromCache != null)
{
return(resultFromCache);
}
var logContext = "PageId: " + pageId.Value;
_appLogger.AddLog(LogProcess.PagesLoaderOrGc, topicId, logContext,
$"Restoring page #{pageId} from compressed source");
var pageCompressedContent = await _compressedMessagesStorage.GetCompressedPageAsync(topicId, pageId);
var dt = DateTime.UtcNow;
if (pageCompressedContent.ZippedContent.Length == 0)
{
_appLogger.AddLog(LogProcess.PagesLoaderOrGc, topicId, logContext,
$"Can not restore page #{pageId} from compressed source. Duration: {DateTime.UtcNow - dt}");
return(null);
}
var msgs = pageCompressedContent.Messages;
long minId = 0;
long maxId = 0;
if (msgs.Count > 0)
{
minId = msgs.Min(itm => itm.MessageId);
maxId = msgs.Max(itm => itm.MessageId);
}
_appLogger.AddLog(LogProcess.PagesLoaderOrGc, topicId, logContext,
$"Restored page #{pageId} from compressed source. Duration: {DateTime.UtcNow - dt}. Messages: {msgs.Count}. MinId: {minId}, MaxId: {maxId}");
var result = new ReadOnlyContentPage(pageCompressedContent);
_messagesContentCache.AddPage(topicId, result);
return(result);
}
private async Task GcThreadTopicSynchronizedAsync(string topicId, MessagePageId pageId)
{
var page = _messagesContentCache.TryGetPage(topicId, pageId);
if (page == null)
{
return;
}
var gcResult = await _messagesContentPersistentStorage.TryToGcAsync(topicId, pageId);
if (gcResult.NotFound)
{
_logger.AddLog(LogProcess.PagesLoaderOrGc, topicId, "PageNo:" + pageId, "Attempt to GC PageWriter which is not found. Disposing page from the Cache");
_messagesContentCache.DisposePage(topicId, pageId);
return;
}
if (gcResult.NotReadyToGc)
{
_logger.AddLog(LogProcess.PagesLoaderOrGc, topicId, "PageNo:" + pageId, "Attempt to GC PageWriter which has not synced messages. Trying to Sync them to the Blob and skipping for the next round");
await _messagesContentPersistentStorage.SyncAsync(topicId, pageId);
return;
}
if (gcResult.DisposedPageWriter != null)
{
_logger.AddLog(LogProcess.PagesLoaderOrGc, topicId, "PageNo:" + pageId, "PageWriter disposed Ok.. Disposing From Cache");
await _compressPageBlobOperation.ExecuteOperationThreadTopicSynchronizedAsync(topicId, pageId, gcResult.DisposedPageWriter.AssignedPage);
_messagesContentCache.DisposePage(topicId, pageId);
_logger.AddLog(LogProcess.PagesLoaderOrGc, topicId, "PageNo:" + pageId, "Page is disposed from Cache");
}
}