Created
February 6, 2017 16:19
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thread-uidelay-test.py
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from requests_futures.sessions import FuturesSession | |
from concurrent.futures import * | |
import re | |
import ui | |
import requests | |
class SyncBackend (object): | |
URL = 'http://tycho.usno.navy.mil/cgi-bin/timer.pl' | |
RE_TIME = re.compile('<BR>(.*?)\t.*Universal Time') | |
def __init__(self, time_callback): | |
self.executor = ThreadPoolExecutor(max_workers=1) | |
self.time = '' | |
self.cb = time_callback | |
self.running = True | |
self.run_one() | |
def run_one(self): | |
self.future = self.executor.submit(self.worker) | |
self.future.add_done_callback(self.callback) | |
def worker(self): | |
resp = requests.get(self.URL) | |
return self.RE_TIME.search(resp.text).group(1) | |
def callback(self, future_state): | |
try: | |
self.time = future_state.result() | |
self.cb(self.time) | |
except Exception as e: | |
print(e) | |
if self.running: | |
self.run_one() | |
def cancel(self): | |
self.running = False | |
class TestView(ui.View): | |
def __init__(self): | |
self.create_layout() | |
self.request_counter = 0 | |
self.sync = SyncBackend(self.callback) | |
self.counter = 0 | |
ui.delay(self.increment_counter, 0.05) | |
def increment_counter(self): | |
self.counter += 1 | |
self.counter_label.text = str(self.counter) | |
ui.delay(self.increment_counter, 0.05) | |
def callback(self, new_time): | |
self.request_counter += 1 | |
self.time_label.text = str(self.request_counter) + ' - ' + new_time | |
def will_close(self): | |
self.sync.cancel() | |
def create_layout(self): | |
self.background_color = 'white' | |
self.counter_label = ui.Label() | |
self.time_label = ui.Label() | |
self.counter_label.width = self.time_label.width = 300 | |
self.counter_label.height = self.time_label.height = 200 | |
self.counter_label.center = (self.width * 0.5, self.height * 0.3) | |
self.time_label.center = (self.width * 0.5, self.height * 0.6) | |
self.counter_label.flex = self.time_label.flex = 'LRTB' | |
self.counter_label.text_color = self.time_label.text_color = 'black' | |
self.counter_label.text = self.time_label.text = 'Start' | |
self.add_subview(self.counter_label) | |
self.add_subview(self.time_label) | |
v = TestView() | |
v.present('sheet') |
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