public static void LeaveUser(int chatRoomId, ChatSession chatSession)
{
List<ChatSession> lSessions = dChatRoomUsers[chatRoomId];
ChatSession sessInstance = lSessions.Find(
delegate(ChatSession sess) { return sess.ChatUserInstance.Id == chatSession.ChatUserInstance.Id; });
if (sessInstance != null)
{
lSessions.Remove(sessInstance);
if (sessInstance.JoinedChatRooms.IndexOf(chatRoomId) >= 0)
{
sessInstance.JoinedChatRooms.Remove(chatRoomId);
}
}
}
public static ChatRoomEvents FetchEvents(int chatRoomId, int? fromId, ChatSession chatSession)
{
if (!dChatRooms.ContainsKey(chatRoomId)) return null;
List<ChatMessage> lMessages = dChatRooms[chatRoomId];
ChatRoomEvents chatRoomEvents = new ChatRoomEvents();
lock (lMessages)
{
chatRoomEvents.Messages.AddRange(
lMessages.FindAll(delegate(ChatMessage msg)
{
return (!fromId.HasValue
|| (fromId.HasValue && msg.Id > fromId.Value))
&& (!msg.TargetUserId.HasValue
|| chatSession.ChatUserInstance.Id == msg.TargetUserId.Value);
}));
if (!fromId.HasValue && chatRoomEvents.Messages.Count > 10)
chatRoomEvents.Messages.RemoveRange(0, chatRoomEvents.Messages.Count - 10);
}
// Update last activity time
ChatSession foundSession = dChatRoomUsers[chatRoomId].Find(
delegate(ChatSession sess)
{
try
{
return sess.ChatUserInstance.Username == chatSession.ChatUserInstance.Username;
}
catch
{
return false;
}
});
if (foundSession != null) foundSession.LastActivity = DateTime.Now;
return chatRoomEvents;
}
public static void JoinUser(int chatRoomId, ChatSession chatSession)
{
if (!dChatRoomUsers.ContainsKey(chatRoomId))
dChatRoomUsers.Add(chatRoomId, new List<ChatSession>());
List<ChatSession> lSessions = dChatRoomUsers[chatRoomId];
if (lSessions.Find(
delegate(ChatSession sess)
{
return sess.ChatUserInstance.Id == chatSession.ChatUserInstance.Id;
}) == null)
{
lSessions.Add(chatSession);
}
chatSession.LastActivity = DateTime.Now;
}