public override Tuple Take(Tuple tuple)
{
int timeStep = 250; // ms
List <Message> messages = null;
Message resultMessage = null;
List <Tuple> intersection = new List <Tuple>();
Tuple selectedTuple = new Tuple(new List <object>());
// PHASE 1
var takeRequest = new TakeRequest(ClientRequestSeqNumber, EndpointURL, tuple);
// wait for all responses
MulticastMessageWaitAll(View.Nodes, takeRequest);
WaitMessage(takeRequest, View.Nodes);
ClientRequestSeqNumber++;
lock (ReplyResultQueue)
{
ReplyResultQueue.TryGetValue(takeRequest, out var replyResult);
messages = new List <Message>(replyResult?.GetAllResults());
}
// get the intersection
Response response;
intersection = ((Response)messages.First()).Tuples;
foreach (Message msg in messages)
{
response = (Response)msg;
intersection = new List <Tuple>(intersection.Intersect(response.Tuples));
}
// choose random tuple from intersection
selectedTuple = intersection.ElementAt((new Random()).Next(0, intersection.Count));
// phase 2, issue a take remove and wait for all acks
Message takeRemove = new TakeRemove(EndpointURL, selectedTuple, takeRequest.SeqNum);
MulticastMessageWaitAll(View.Nodes, takeRemove);
WaitMessage(takeRemove, View.Nodes);
return(selectedTuple);
}
public override Tuple Read(Tuple tuple)
{
Message resultMessage = null;
var request = new ReadRequest(ClientRequestSeqNumber, EndpointURL, tuple);
MulticastMessageWaitAny(View.Nodes, request);
// wait until it gets a any message
WaitMessage(request, View.Nodes);
lock (ReplyResultQueue)
{
ReplyResultQueue.TryGetValue(request, out var replyResult);
resultMessage = replyResult?.GetAnyResult();
}
ClientRequestSeqNumber++;
Response response = (Response)resultMessage;
return(response.Tuples.First());
}
