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from __future__ import print_function
import time
from concurrent.futures import ThreadPoolExecutor
from opentracing.mocktracer import MockTracer
from ..testcase import OpenTracingTestCase
class TestThreads(OpenTracingTestCase):
def setUp(self):
self.tracer = MockTracer()
self.executor = ThreadPoolExecutor(max_workers=3)
def test_main(self):
# Create a Span and use it as (explicit) parent of a pair of subtasks.
parent_span = self.tracer.start_span('parent')
self.submit_subtasks(parent_span)
# Wait for the threadpool to be done.
self.executor.shutdown(True)
# Late-finish the parent Span now.
parent_span.finish()
spans = self.tracer.finished_spans()
self.assertEqual(len(spans), 3)
self.assertNamesEqual(spans, ['task1', 'task2', 'parent'])
for i in range(2):
self.assertSameTrace(spans[i], spans[-1])
self.assertIsChildOf(spans[i], spans[-1])
self.assertTrue(spans[i].finish_time <= spans[-1].finish_time)
# Fire away a few subtasks, passing a parent Span whose lifetime
# is not tied at all to the children.
def submit_subtasks(self, parent_span):
def task(name, interval):
with self.tracer.scope_manager.activate(parent_span, False):
with self.tracer.start_active_span(name):
time.sleep(interval)
self.executor.submit(task, 'task1', 0.1)
self.executor.submit(task, 'task2', 0.3)
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