public MessageSet GetMessagesBetween(DateTime first, DateTime last)
{
MessageSet msgSet = null;
// if their is a change in te architecture of packs while we retreive messages, then we try again
// To detect when the structure has changed, we add a guid in metadata to get the version of the structure
do
{
// get blobs
List <KeyValuePair <DateTime, CloudBlob> > blobsList = GetBlobs();
if (!blobsList.Any())
{
return(new MessageSet());
}
// get the right blob
// TODO : find a better datasutrcture to do this faster
int blobIndex = blobsList.IndexOf(blobsList.Last(p => p.Key <= first));
// get the messages
try
{
msgSet = GetMessageSet(new Blob <MessageSet>(blobsList[blobIndex].Value));
// get messages from following sets while we need them
for (blobIndex++; blobIndex < blobsList.Count && msgSet.Max.Date < last; blobIndex++)
{
msgSet.UnionWith(GetMessageSet(new Blob <MessageSet>(blobsList[blobIndex].Value)));
}
}
catch (VersionHasChanged) { continue; }
} while (false);
return(msgSet.GetViewBetween(Message.FirstMessage(first), Message.LastMessage(last)));
}
// TODO : change list to set for a better merge
public List <Message> GetMessagesTo(DateTime date, int msgCount, Exception e)
{
MessageSet msgSet = null;
// TODO : use something else than reverse
do
{
// get blobs
List <KeyValuePair <DateTime, CloudBlob> > blobsList = GetBlobs();
if (!blobsList.Any())
{
throw e;
}
// get the right blob
// TODO : find a better datasutrcture to do this faster
int blobIndex = blobsList.IndexOf(blobsList.Last(p => p.Key <= date));
// get the messages
try
{
msgSet = GetMessageSet(new Blob <MessageSet>(blobsList[blobIndex].Value));
msgSet = msgSet.GetViewBetween(Message.FirstMessage(), Message.LastMessage(date));
// get messages from following sets while we need them
for (blobIndex--; blobIndex >= 0 && msgSet.Count < msgCount; blobIndex--)
{
msgSet.UnionWith(GetMessageSet(new Blob <MessageSet>(blobsList[blobIndex].Value)));
}
}
catch (VersionHasChanged) { continue; }
} while (false);
List <Message> msgList = msgSet.ToList();
if (msgList.Count > msgCount)
{
msgList = msgList.GetRange(msgList.Count - msgCount, msgCount);
}
return(msgList);
}
