public static bool IsUserOnChatRoomConnectionPool(Guid userId, ChatRoomConnectionPool chatRoomConnection)
{
foreach (var server in chatRoomConnection.ServerInstances)
{
var connectedUser = server.ConnectedUsers.Where(conn => conn.UserId == userId).FirstOrDefault();
if (connectedUser != null)
{
return(true);
}
}
return(false);
}
public static string GetConnectionIdFromChatRoomConnectionPool(Guid userId, ChatRoomConnectionPool chatRoomConnection)
{
foreach (var server in chatRoomConnection.ServerInstances)
{
var connectedUser = server.ConnectedUsers.Where(conn => conn.UserId == userId).FirstOrDefault();
if (connectedUser != null)
{
return(connectedUser.ConnectionId);
}
}
// given user id was not found!
throw new ObjectDoesNotExistException("User was not found in the room!");
}
//
// Summary:
// Increments a chat room's connection pool on Redis.
//
// Exceptions
// ChatRoomIsFullException - raised when the chat room is full
// UserIsAlreadyConnectedException - raised if the user is already connected to the room
public static ChatRoomConnectionPool IncrementChatRoomConnectionPool(Guid userId,
Guid serverInstanceId, string connectionId, ChatRoomConnectionPool chatRoomConnectionPool)
{
if (chatRoomConnectionPool.ActiveConnectionsLimit == chatRoomConnectionPool.TotalActiveConnections)
{
throw new ChatRoomIsFullException("The chat room is already full!");
}
var serverInstance = chatRoomConnectionPool.ServerInstances
.Where(server => server.ServerInstanceId == serverInstanceId)
.FirstOrDefault();
// server instance hosting this chat room is new
if (serverInstance == null)
{
chatRoomConnectionPool.ServerInstances = CreateFirstServerInstance(userId, serverInstanceId, connectionId);
chatRoomConnectionPool.TotalActiveConnections += 1;
return(chatRoomConnectionPool);
}
// server instance is already hosting users for this room
if (IsUserAlreadyInTheRoom(userId, serverInstance.ConnectedUsers))
{
throw new UserIsAlreadyConnectedException("User is already in the room!");
}
serverInstance.ConnectedUsers = serverInstance.ConnectedUsers
.AsQueryable().Append(new ConnectedUser {
UserId = userId, ConnectionId = connectionId
});
chatRoomConnectionPool.TotalActiveConnections += 1;
return(chatRoomConnectionPool);
}
//
// Summary:
// Decrements a chat room's connection pool on Redis based on a connection id.
//
// Exceptions
// UserIsNotConnectedException - raised if the user connection was not found.
public static ChatRoomConnectionPool DecrementChatRoomConnectionPool(Guid serverInstanceId,
string connectionId, ChatRoomConnectionPool chatRoomConnectionPool)
{
var serverInstance = chatRoomConnectionPool.ServerInstances
.Where(server => server.ServerInstanceId == serverInstanceId)
.FirstOrDefault();
var connectedUser = serverInstance?.ConnectedUsers.Where(conn => conn.ConnectionId == connectionId);
// makes sure a server instance exists and that the connectionId exists
if (serverInstance == null || connectedUser.Count() == 0)
{
throw new ObjectDoesNotExistException("User was not found in the room! Maybe he has left already?");
}
// updated list with the removed connection
var updatedConnections = serverInstance.ConnectedUsers.ToList();
updatedConnections.RemoveAll(conn => conn.ConnectionId == connectionId);
serverInstance.ConnectedUsers = updatedConnections;
chatRoomConnectionPool.TotalActiveConnections -= 1;
return(chatRoomConnectionPool);
}
