/**
* Remove locked tuples from LockedTuples List, and add them back to the tuple space
* acts as a release for the "lock" of a take request
*/
private void ReleaseLockedTuples(int takeRequestSeqNum)
{
// remove from LockedTuples
bool isRemoved = LockedTuples.TryRemove(takeRequestSeqNum, out List <Tuple> tuples);
// add back to TupleSpace
if (isRemoved)
{
foreach (Tuple tuple in tuples)
{
TupleSpace.Write(tuple);
}
}
}
/**
* Remove the selected tuple and add the remaining locked tuples back to the tuplespace
*/
private Message ProcessTakeRemove(Message message)
{
TakeRemove takeRemove = (TakeRemove)message;
LockedTuples.TryRemove(takeRemove.TakeRequestSeqNumber, out List <Tuple> lockedTuples);
// remove the selected tuple specified in the request
if (lockedTuples != null && takeRemove.SelectedTuple != null)
{
lockedTuples.Remove(takeRemove.SelectedTuple);
// add back the remaining tuples to the tuple space
foreach (Tuple tuple in lockedTuples)
{
TupleSpace.Write(tuple);
}
}
// Send back an Ack of the remove
Ack ack = new Ack(EndpointURL, takeRemove);
SendMessageToRemoteURL(takeRemove.SrcRemoteURL, ack);
return(ack);
}
private void Write(Tuple tuple)
{
TupleSpace.Write(tuple);
Log("Wrote : " + tuple);
}
public Message ProcessRequest(Request request)
{
var tupleSchema = new TupleSchema(request.Tuple);
if (request.GetType() == typeof(WriteRequest))
{
TupleSpace.Write(request.Tuple);
// notify a blocked thread that tried to read/take this tuple before
Request readOrTakeRequest = GetAndRemoveSinglePendingRequest(request.Tuple);
if (readOrTakeRequest != null)
{
PulseMessage(readOrTakeRequest);
}
// Send back an Ack of the write
return(new Ack(EndpointURL, request));
}
if (request.GetType() == typeof(ReadRequest))
{
List <Tuple> tuples = TupleSpace.Read(tupleSchema);
while (!tuples.Any())
{
lock (PendingRequestList){
PendingRequestList.Add(request);
}
WaitMessage(request, View.Nodes);
tuples = TupleSpace.Read(tupleSchema);
}
Response response = new Response(request, tuples, EndpointURL);
return(response);
}
if (request.GetType() == typeof(TakeRequest))
{
tupleSchema = new TupleSchema(request.Tuple);
List <Tuple> resultTuples = TupleSpace.Take(tupleSchema);
Response response = null;
while (!resultTuples.Any())
{
lock (PendingRequestList){
PendingRequestList.Add(request);
}
WaitMessage(request, View.Nodes);
resultTuples = TupleSpace.Take(tupleSchema);
}
// "lock" the tuples taken from the tuple space
LockedTuples.TryAdd(request.SeqNum, resultTuples);
response = new Response(request, resultTuples, EndpointURL);
SendMessageToRemoteURL(request.SrcRemoteURL, response);
return(response);
}
throw new NotImplementedException();
}
public void Write1(Tuple tuple)
{
_tupleSpace.Write(tuple);
}
