public FlowEvent(Flow flow)
{
Flow = flow;
// time
// TODO: jitter!
Time = Simulation.Time + 1.0 / Flow.Speed;
}
/// <summary>
/// Pick a random flow from the array according to their priorities
/// </summary>
/// <param name="flows">Flow array</param>
/// <returns></returns>
public static Flow PickWithPriority(Flow[] flows)
{
// check improbable version
if (flows.Length == 0)
return null;
// pick a random flow according to it's priority
var rnd = Extenders.MathExtender.Random();
double delta = 1.0 / (double)flows.Sum(flow => flow.QoS);
var probability = 0.0;
foreach(var curr in flows)
{
probability += (double)curr.QoS * delta;
if (rnd <= probability) return curr;
}
throw new ArithmeticException("Impossible!");
}
/// <summary>
/// Register a new flow in the system
/// </summary>
/// <param name="flow">Flow to add</param>
public static void AddFlow(Flow flow)
{
Array.Resize(ref Flows, Flows.Length + 1);
Flows[Flows.Length - 1] = flow;
Simulation.RegisterEvent(new FlowEvent(flow));
}
/// <summary> /// The planner action /// </summary> public abstract Symbol Action(Flow[] flows, Symbol lastSymbol);
/// <summary>
/// Mark the block as used and request N blocks from flow queue
/// </summary>
/// <param name="flow">Flow to use</param>
public void Use(Flow flow)
{
Use(flow, Modulation.Bpsk());
}
/// <summary>
/// Mark the block as used, update the modulation type
/// and request N blocks from flow queue
/// </summary>
/// <param name="flow"></param>
/// <param name="modulation"></param>
public void Use(Flow flow, Modulation modulation)
{
if (Used)
throw new Exception("The block is already used!");
Modulation = modulation;
Used = true;
Flow = flow;
if (flow == null)
throw new Exception("No flow!");
if (flow.Data == null)
throw new Exception("no data!");
Data = flow.Data.GetSlice(Size());
}
