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from __future__ import print_function
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):
# Start an isolated task and query for its result -and finish it-
# in another task/thread
span = self.tracer.start_span('initial')
self.submit_another_task(span)
self.executor.shutdown(True)
spans = self.tracer.finished_spans()
self.assertEqual(len(spans), 3)
self.assertNamesEqual(spans, ['initial', 'subtask', 'task'])
# task/subtask are part of the same trace,
# and subtask is a child of task
self.assertSameTrace(spans[1], spans[2])
self.assertIsChildOf(spans[1], spans[2])
# initial task is not related in any way to those two tasks
self.assertNotSameTrace(spans[0], spans[1])
self.assertEqual(spans[0].parent_id, None)
def task(self, span):
# Create a new Span for this task
with self.tracer.start_active_span('task'):
with self.tracer.scope_manager.activate(span, True):
# Simulate work strictly related to the initial Span
pass
# Use the task span as parent of a new subtask
with self.tracer.start_active_span('subtask'):
pass
def submit_another_task(self, span):
self.executor.submit(self.task, span)
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