Base DEVS: Devs

Devs defined in the source file Devs.cs is an abstract class derived from Named. Devs points its parent through its Parent field which is assigned by Coupled::AddModel() (see Section 2.2.3).

public class Devs: Named {
    public Coupled  Parent; // parent pointer
    ...

There are adding, getting, removing, and printing functions for the input ports denoted as AddIP, GetIP, RemoveIP, and PrintAllIPs. Similarly, AddOP, GetOP, RemoveOP, and PrintAllOPs are available functions for the output ports.

In addition, IP and OP get the set of input ports as SortedList<string, InputPort> and the set of output ports as SortedList<string, OutputPort>, respectively.

    //-- X port Methods --
    InputPort AddIP(string ipn);
    InputPort GetIP(string ipn) const;
    InputPort RemoveIP(string ipn);
    void PrintAllIPs() ;
    public SortedList<string, InputPort> IP {get ; }

    //-- Y port Methods --
    OutputPort AddOP(string opn);
    OutputPort GetOP(string opn) const;
    OutputPort RemoveOP(string opn);
    void PrintAllOPs() ;
    public SortedList<string, OutputPort> OP {get ; }

Devs has time-related properties such as TimeLast for getting (or setting) the last schedule update time; TimeNext for the next schedule time; TimeElapsed for the elapsed time between the last schedule time and the current time; TimeRemaining for the remaining time from the current time to the next schedule time; TimeAdvance for the time difference between TimeNext and TimeLast.

TimeCurrent is a static and public data field for the current time;

    public double TimeLast { get; set; }
    public double TimeNext { get; set; }

    public double TimeElapsed  { get; }
    public double TimeRemaining  { get; }
    public double TimeAdvance  { get; }

    public static double TimeCurrent ; // data field

Figure 2.2 illustrates the relationships among different times. The user doesn't have to set the values of these time variables because such calculation will be performed by the simulation engine class, called SRTEngine in DEVS#, according to the user-defined $\tau(s)$ for each state of each model. For more detailed information this algorithm, the user can refer to [Zei87,ZPK00]

Figure 2.2: Relations of Times