public List <FeedMessage> GetSnapShot(string messageType, string SubscriptionCode, out List <long> snapshotSequenceNumbers)
{
lock (m_DictionarySnapShots)
{
snapshotSequenceNumbers = new List <long>();
List <FeedMessage> snapShotList = new List <FeedMessage>();
List <FeedMessage> SortedSnapshotList = null;
try
{
lock (m_DictionarySnapShots)
{
if (m_DictionarySnapShots.ContainsKey(messageType) == false)
{
return(new List <FeedMessage>()); // count will be zero.
}
MessagesSnapShot msgSnapshot = m_DictionarySnapShots[messageType];
List <FeedMessage> symbolfeedMsgList;
bool result = msgSnapshot.dictioanryFeedMessage.TryGetValue(SubscriptionCode, out symbolfeedMsgList);
if (result)
{
foreach (FeedMessage feedMsg in symbolfeedMsgList)
{
snapShotList.Add(feedMsg);
snapshotSequenceNumbers.Add(feedMsg.SequenceNumber); // store snapshot sequecenumber to avoid sending the feedmessage more than once in the ClientSession.
}
}
}
SortedSnapshotList = snapShotList.OrderBy(feedmsg => feedmsg.SequenceNumber).ToList();
if (SortedSnapshotList == null)
{
return(new List <FeedMessage>());
}
if (SortedSnapshotList.Count <= 0)
{
return(new List <FeedMessage>()); // count will be zero.
}
else
{
m_NLog.Info("Snapshot prepared successfully. MessageType : {0} , SubscribtionKey : {1} and number of FeedMessages in the snapshot : {2}", messageType, SubscriptionCode, SortedSnapshotList.Count);
return(SortedSnapshotList);
}
}
catch (Exception exp)
{
m_NLog.Error("Error in GetSnapShot method.");
m_NLog.Error(exp.ToString());
return(new List <FeedMessage>());
}
}
}
private void StoreFeedMessagesToSnapShot()
{
try
{
while (true)
{
if (SnapShotFeedMessagesQueue.Count == 0)
{
System.Threading.Thread.Sleep(500);
}
FeedMessage feedMsg;
bool isSnaphotMsgvalid = SnapShotFeedMessagesQueue.TryDequeue(out feedMsg);
if (isSnaphotMsgvalid)
{
if (m_DictionarySnapShots.ContainsKey(feedMsg.MessageType))
{
MessagesSnapShot msgSnapshot = m_DictionarySnapShots[feedMsg.MessageType];
msgSnapshot.AddFeedMessage(feedMsg);
}
else
{
MessagesSnapShot msgsSnapshot = new MessagesSnapShot();
m_DictionarySnapShots.Add(feedMsg.MessageType, msgsSnapshot);
msgsSnapshot.AddFeedMessage(feedMsg);
}
}
}
}
catch (Exception exp)
{
m_NLog.Error("Error in StoreFeedMessagesToSnapShot method.");
m_NLog.Error(exp.ToString());
}
}