misc/obsolete-ships/Counter.java

   1 package edu.berkeley.fleet.interpreter.ships;
   2 import edu.berkeley.fleet.interpreter.*;
   3 import edu.berkeley.fleet.*;
   4
   5 import java.util.*;
   6 import java.io.*;
   7
   8 public class Counter extends InterpreterShip {
   9
  10     private int count = 0;
  11
  12     DataInbox   load      = new DataInbox(this, "load");
  13     TokenInbox  decrement = new TokenInbox(this, "decrement");
  14     TokenOutbox zero      = new TokenOutbox(this, "zero");
  15
  16     public Counter(Interpreter fleet, String name) {
  17         super(fleet, name);
  18     }
  19
  20     public String getBalsaName() { return "counter"; }
  21     public void service() {
  22         if (!zero.readyForTokenFromShip()) return;
  23         if (count==0 && load.dataReadyForShip()) {
  24             count = load.removeDataForShip();
  25             return;
  26         }
  27         if (count>0 && decrement.tokenReadyForShip()) {
  28             decrement.removeTokenForShip();
  29             count--;
  30             if (count==0)
  31                 zero.addTokenFromShip();
  32         }
  33     }
  34
  35 }