def test_lock_context_manager(self):
# Ensure that lock creates an entry in memcache.
key = 'KEY'
lock_key_name = locking.get_lock_key_name(key)
with locking.lock(key):
self.assertTrue(memcache.get(lock_key_name))
stats = memcache.get_stats()
self.assertEqual(1, stats['items'])
self.assertIsNone(memcache.get(lock_key_name))
def test_lock_context_manager_raises_exeception_when_key_is_locked(self):
# Acquire lock on a key.
key = 'KEY'
lock_key_name = locking.get_lock_key_name(key)
locking.acquire_lock(lock_key_name)
stats = memcache.get_stats()
self.assertEqual(1, stats['items'])
# Ensure a RuntimeError is raised.
with self.assertRaises(RuntimeError):
with locking.lock(lock_key_name, tries=1):
pass