system_modeling.py

#!/usr/bin/python
import time                                                                
import optparse                                                 
from datetime import datetime, timedelta
import string
import random
import sys
 
minute = 60
hour = 60 * minute
time_scale = 0.0001

class time_emulator(): 
    def __init__(self):
        self.start_time = time.mktime(datetime.now().timetuple()) + float(datetime.now().strftime('.%f'))
        print "Start time: " + str(self.start_time)
 
    def get_current_time(self):
        time_delta = (time.mktime(datetime.now().timetuple()) + float(datetime.now().strftime('.%f')))- self.start_time 
        current_time = int(time_delta / time_scale)
        return current_time
 
class request():
    def __init__(self, number, appear_time):
        self.number = number
        self.appear_time = appear_time
        #print self.number, ": ", self.appear_time

class truck():
    def __init__(self):
        self.status = "free"
        self.work_end_time = 0

if __name__ == "__main__":
    requests = []
    trucks = [truck(), truck()]
    requests_counter = 0
    total_requests_counter = 0
    link_time_end = 0
    current_time = time_emulator()
    new_request_time = 5 * minute + random.randint(-4 * minute, 4 * minute)
    last_request_time = 0
    while (current_time.get_current_time() <= 10 * hour):
        if  current_time.get_current_time() >= last_request_time + new_request_time:
            new_request_time = 5 * minute + random.randint(-4 * minute, 4 * minute)
            last_request_time = current_time.get_current_time()
            total_requests_counter += 1
            if len(requests) < 5:
                requests_counter +=1
                requests.append(request(requests_counter, current_time.get_current_time()))

        truck_number = random.randint(0 ,1) 
        if len(requests) != 0 and link_time_end < current_time.get_current_time():
            if  trucks[truck_number].status == "free":
                trucks[truck_number].status = "busy"
                trucks[truck_number].work_end_time = current_time.get_current_time() + 12 * minute + random.randint(-8 * minute, 8 * minute)
                link_time_end = current_time.get_current_time() + minute
                del requests[0]
                print "Truck #", truck_number, " Work start at", current_time.get_current_time()," | end at ", trucks[truck_number].work_end_time
            if  trucks[truck_number].status == "busy":
                link_time_end = current_time.get_current_time() + minute
        for truck in trucks:
            if current_time.get_current_time() > truck.work_end_time:
                truck.status = "free"

    print "Done ", requests_counter, " requests."
    print "Total ", total_requests_counter, " requests."