# L-35 MCS 260 Fri 8 Apr 2016 : class_producer.py
"""
Illustration of producer/consumer with threads.
An object of the class Producer is a thread that
will append to a queue consecutive integers in
a given range and at a given pace.
"""
from threading import Thread
from random import randint
from time import sleep

class Producer(Thread):
    """
    Appends integers to a queue.
    """
    def __init__(self, t, q, a, b, p):
        """
        Thread t to add integers in [a,b] to q,
        sleeping between 1 and p seconds.
        """
        Thread.__init__(self, name=t)
        self.queue = q
        self.begin = a
        self.end = b
        self.pace = p

    def run(self):
        """
        Produces integers at some pace.
        """
        print(self.getName() + " starts...")
        for i in range(self.begin, self.end+1):
            rnd = randint(1, self.pace)
            print(self.getName() + \
                " sleeps %d seconds" % rnd)
            sleep(rnd)
            print("appending %d to queue" % i)
            self.queue.append(i)
        print("production terminated")

def main():
    """
    Creates a producer object.
    """
    que = []
    prd = Producer('producer', que, 3, 9, 10)
    prd.start()
    prd.join()

if __name__ == "__main__":
    main()