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#!/usr/bin/python
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
'''Producer-Consumer test/example with QThread'''
import gc
import logging
import os
from random import random
import sys
import unittest
from pathlib import Path
sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
from init_paths import init_test_paths
init_test_paths(False)
logging.basicConfig(level=logging.WARNING)
from PySide6.QtCore import QThread, QCoreApplication, QObject, SIGNAL
class Bucket(QObject):
'''Dummy class to hold the produced values'''
def __init__(self, max_size=10, *args):
# Constructor which receives the max number of produced items
super().__init__(*args)
self.data = []
self.max_size = 10
def pop(self):
# Retrieves an item
return self.data.pop(0)
def push(self, data):
# Pushes an item
self.data.append(data)
class Producer(QThread):
'''Producer thread'''
def __init__(self, bucket, *args):
# Constructor. Receives the bucket
super().__init__(*args)
self.runs = 0
self.bucket = bucket
self.production_list = []
def run(self):
# Produces at most bucket.max_size items
while self.runs < self.bucket.max_size:
value = int(random() * 10) % 10
self.bucket.push(value)
self.production_list.append(value)
logging.debug(f'PRODUCER - pushed {value}')
self.runs += 1
self.msleep(5)
class Consumer(QThread):
'''Consumer thread'''
def __init__(self, bucket, *args):
# Constructor. Receives the bucket
super().__init__(*args)
self.runs = 0
self.bucket = bucket
self.consumption_list = []
def run(self):
# Consumes at most bucket.max_size items
while self.runs < self.bucket.max_size:
try:
value = self.bucket.pop()
self.consumption_list.append(value)
logging.debug(f'CONSUMER - got {value}')
self.runs += 1
except IndexError:
logging.debug('CONSUMER - empty bucket')
self.msleep(5)
class ProducerConsumer(unittest.TestCase):
'''Basic test case for producer-consumer QThread'''
def setUp(self):
# Create fixtures
self.app = QCoreApplication([])
def tearDown(self):
# Destroy fixtures
del self.app
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
def testProdCon(self):
# QThread producer-consumer example
bucket = Bucket()
prod = Producer(bucket)
cons = Consumer(bucket)
cons.finished.connect(QCoreApplication.quit)
prod.start()
cons.start()
self.app.exec()
self.assertTrue(prod.wait(1000))
self.assertTrue(cons.wait(1000))
self.assertEqual(prod.production_list, cons.consumption_list)
if __name__ == '__main__':
unittest.main()
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