# gui.py

from multiprocessing import Queue
import tkinter as tk
from tkinter import ttk

import builder
import logger

class Gui(tk.Tk):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        btn = ttk.Button(self, text='Build', command=lambda: builder.Build(q))
        btn.pack()
        log.configure(q)
        self.mainloop()

if __name__ == '__main__':
    q = Queue()
    log = logger.Logger()
    Gui()

# logger.py

import logging
import logging.handlers

class Logger:
    def __init__(self):
        self.logger = logging.getLogger('dcre')
        self.logger.setLevel('DEBUG')
        self.log = self.logger.log

    def configure(self, q):
        self.q = q
        self.qh = logging.handlers.QueueHandler(self.q)
        self.file = logging.FileHandler('log.log')
        self.file.setLevel('DEBUG')
        self.logger.addHandler(self.qh)
        self.logger.addHandler(self.file)
        logging.basicConfig(level='INFO')

# builder.py

import logging
from multiprocessing import Process
import threading

class Build:
    def __init__(self, q):
        self.queue = q
        self.logger = logging.getLogger('dcre')

        workers = []
        for i in range(5):
            wp = Process(target=self.foo, args=(i,))
            workers.append(wp)
            wp.start()

            lp = threading.Thread(target=self.logger_thread)
            lp.start()
            for wp in workers:
                wp.join()

            self.queue.put(None)
            lp.join()

    def logger_thread(self):
        while True:
            record = self.queue.get()
            if record is None:
                break
            self.logger.handle(record)

    def foo(self, i):
        msgs = (
            (10, "This is a DEBUG message. You shouldn't see this."),
            (20, 'This is an INFO message. Just so you know.'),
            (30, 'This is a WARNING message. Be careful, yo.'),
            (40, 'This is an ERROR message. Man, you done messed up.'),
            (50, 'This is a CRITICAL message. Game over!')
        )
        self.logger.log(*msgs[i])

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