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