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# Copyright 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import threading
class TestCollection(object):
"""A threadsafe collection of tests.
Args:
tests: List of tests to put in the collection.
"""
def __init__(self, tests=None):
if not tests:
tests = []
self._lock = threading.Lock()
self._tests = []
self._tests_in_progress = 0
# Used to signal that an item is available or all items have been handled.
self._item_available_or_all_done = threading.Event()
for t in tests:
self.add(t)
def _pop(self):
"""Pop a test from the collection.
Waits until a test is available or all tests have been handled.
Returns:
A test or None if all tests have been handled.
"""
while True:
# Wait for a test to be available or all tests to have been handled.
self._item_available_or_all_done.wait()
with self._lock:
# Check which of the two conditions triggered the signal.
if self._tests_in_progress == 0:
return None
try:
return self._tests.pop(0)
except IndexError:
# Another thread beat us to the available test, wait again.
self._item_available_or_all_done.clear()
def add(self, test):
"""Add a test to the collection.
Args:
test: A test to add.
"""
with self._lock:
self._tests.append(test)
self._item_available_or_all_done.set()
self._tests_in_progress += 1
def test_completed(self):
"""Indicate that a test has been fully handled."""
with self._lock:
self._tests_in_progress -= 1
if self._tests_in_progress == 0:
# All tests have been handled, signal all waiting threads.
self._item_available_or_all_done.set()
def __iter__(self):
"""Iterate through tests in the collection until all have been handled."""
while True:
r = self._pop()
if r is None:
break
yield r
def __len__(self):
"""Return the number of tests currently in the collection."""
return len(self._tests)
def test_names(self):
"""Return a list of the names of the tests currently in the collection."""
with self._lock:
return list(t.test for t in self._tests)
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