public override bool CompareTo(Query o)
{
QueryByFile q2 = (QueryByFile)o;
if (this.Name.CompareTo(q2.Name) == 0 &&
this.LowestId.CompareTo(q2.LowestId) == 0 &&
this.Uris.ElementAt(0).CompareTo(q2.Uris.ElementAt(0)) == 0)
return true;
else
return false;
}
public abstract bool CompareTo(Query o);
private string whoSentQuery(Query query)
{
foreach (Friend f in ServerApp._user.Friends)
{
if (f.Uris.ElementAt(0).CompareTo(query.ContactingServerUri.ElementAt(0)) == 0)
return f.Name;
}
MessageBox.Show(ServerApp._user.Username + "WhoIsUri called with invalid node uri");
return "";
}
private bool isPredecessor(Query q)
{
foreach (Friend f in ServerApp._user.Friends)
{
if (q.ContactingServerUri.ElementAt(0).CompareTo(f.Uris.ElementAt(0)) == 0)
{
if(!f.SucessorSwarm)
return true;
}
}
return false;
}
private List<Query> getList(Query query)
{
List<Query> messageList = new List<Query>();
List<Query> messages = new List<Query>();
if (query is QueryByFile)
{
foreach (QueryByFile q in ServerApp._user.ReceivedFileMessages)
messages.Add(q);
}
else
{
foreach (QueryByName q in ServerApp._user.ReceivedNameMessages)
messages.Add(q);
}
//Only returns messages wich have the same ID and belong to predecessor nodes.
foreach (Query q in messages)
{
if (q.Id.Equals(query.Id))
{
messageList.Add(q);
}
}
return messageList;
}
private bool consensus(Query query)
{
int i, j, counting;
//This list contains all the messages from PREDECESSORS with the same ID
List<Query> messageList = getList(query);
bool sendMessage = false;
Query q1, q2;
//Checks if it has received #predecessors/2 answers, if so it responds and stores Datetime on sentMessages
//otherwise it adds query to receivedMessages
MessageBox.Show("MessageCount = " + messageList.Count + " predecessors count = " + ServerApp._user.Friends.Count(x => !x.SucessorSwarm));
if (messageList.Count > ServerApp._user.Friends.Count(x => !x.SucessorSwarm) / 2)
{
//anwer message
//do consensus thing------------------------------
for (i = 0; i < messageList.Count; i++)
{
q1 = messageList.ElementAt(i);
counting = 0;
for (j = i + 1; j < messageList.Count; j++)
{
q2 = messageList.ElementAt(j);
if (q1.CompareTo(q2))
counting++;
}
if (counting + 1 >= ServerApp._user.Friends.Count(x => !x.SucessorSwarm) / 2)
{
sendMessage = true;
break;
}
}
if(sendMessage == false)
MessageBox.Show(ServerApp._user.Username + " : There are enough messages but still no consensus.");
//-------------------------------------------------
}
else
{
MessageBox.Show(ServerApp._user.Username + " : Still not enough messages to do consensus.");
}
return sendMessage;
}
