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  1. using System;
  2. using System.Collections.Generic;
  3. public class TCP
  4. {
  5.  
  6.         private class State
  7.         {
  8.             //TcpFSM state name
  9.             public string Name { get; set; }
  10.  
  11.             // list of trasitions for this state
  12.             public Dictionary<string, State> Transitions { get; set; } = new Dictionary<string, State>();
  13.  
  14.             public State GetNextState(string eventName)
  15.             {
  16.               if (Transitions.TryGetValue(eventName, out var result))
  17.               {
  18.                 return result;
  19.               }
  20.               return null;
  21.             }
  22.         }
  23.  
  24.  
  25.  
  26.         public static string TraverseStates(string[] events)
  27.         {
  28.             var state = "CLOSED"; // initial state, always
  29.                                   // Your code here!
  30.             var tcpStateMachine = Init();
  31.             var currentState = tcpStateMachine;
  32.             foreach (var e in events)
  33.             {
  34.                 currentState = currentState.GetNextState(e);
  35.                 if (currentState is null)
  36.                 {
  37.                     state = "ERROR";
  38.                     break;
  39.                 }
  40.                 state = currentState.Name;
  41.             }
  42.  
  43.             return state;
  44.         }
  45.  
  46.         private static State Init()
  47.         {
  48.             State initialState = new State()
  49.             {
  50.                 Name = "CLOSED"
  51.             };
  52.             State listen = new State()
  53.             {
  54.                 Name = "LISTEN",
  55.             };
  56.             State synSent = new State()
  57.             {
  58.                 Name = "SYN_SENT",
  59.             };
  60.             State synRcvd = new State()
  61.             {
  62.                 Name = "SYN_RCVD",
  63.             };
  64.  
  65.             State established = new State()
  66.             {
  67.                 Name = "ESTABLISHED",
  68.             };
  69.  
  70.             State closeWait = new State()
  71.             {
  72.                 Name = "CLOSE_WAIT"
  73.             };
  74.             State lastAck = new State()
  75.             {
  76.                 Name = "LAST_ACK"
  77.             };
  78.  
  79.  
  80.             State finWait1 = new State()
  81.             {
  82.                 Name = "FIN_WAIT_1"
  83.             };
  84.             State finWait2 = new State()
  85.             {
  86.                 Name = "FIN_WAIT_2"
  87.             };
  88.  
  89.             State timeWait = new State()
  90.             {
  91.                 Name = "TIME_WAIT"
  92.             };
  93.  
  94.             State closing = new State()
  95.             {
  96.                 Name = "CLOSING"
  97.             };
  98.  
  99.             initialState.Transitions["APP_PASSIVE_OPEN"] = listen;
  100.             initialState.Transitions["APP_ACTIVE_OPEN"] = synSent;
  101.  
  102.             listen.Transitions["RCV_SYN"] = synRcvd;
  103.             listen.Transitions["APP_SEND"] = synSent;
  104.             listen.Transitions["APP_CLOSE"] = initialState;
  105.  
  106.             synRcvd.Transitions["APP_CLOSE"] = finWait1;
  107.             synRcvd.Transitions["RCV_ACK"] = established;
  108.  
  109.             synSent.Transitions["RCV_SYN"] = synRcvd;
  110.             synSent.Transitions["RCV_SYN_ACK"] = established;
  111.             synSent.Transitions["APP_CLOSE"] = initialState;
  112.  
  113.             established.Transitions["APP_CLOSE"] = finWait1;
  114.             established.Transitions["RCV_FIN"] = closeWait;
  115.  
  116.             finWait1.Transitions["RCV_FIN"] = closing;
  117.             finWait1.Transitions["RCV_FIN_ACK"] = timeWait;
  118.             finWait1.Transitions["RCV_ACK"] = finWait2;
  119.  
  120.             closing.Transitions["RCV_ACK"] = timeWait;
  121.             finWait2.Transitions["RCV_FIN"] = timeWait;
  122.  
  123.             timeWait.Transitions["APP_TIMEOUT"] = initialState;
  124.  
  125.             closeWait.Transitions["APP_CLOSE"] = lastAck;
  126.  
  127.             lastAck.Transitions["RCV_ACK"] = initialState;
  128.  
  129.             return initialState;
  130.         }
  131. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cs(35,34): error CS1644: Feature `pattern matching' cannot be used because it is not part of the C# 7.0 language specification
Compilation failed: 1 error(s), 0 warnings
stdout 
Standard output is empty
https://ideone.com/Twnueq
language:
C# (gmcs 5.20.1)
created:
2 years ago
visibility:
public

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