def persist_task():
"""Persist all gae/bingo cache entities to the datastore.
After persisting, this task should queue itself up for another run quickly
thereafter.
This function uses a lock to make sure that only one persist task
is running at a time.
"""
lock = PersistLock()
# Take the lock (only one persist should be running at a time)
if not lock.take():
logging.info("Skipping gae/bingo persist, persist lock already owned.")
return
logging.info("Persisting gae/bingo state from memcache to datastore")
try:
# Make sure request and instance caches are flushed, because this task
# doesn't go through the normal gae/bingo WSGI app which is wrapped in
# middleware. Regardless, we want to flush instance cache so that we're
# persisting the current shared memcache state of all exercises to the
# datastore.
request_cache.flush_request_cache()
instance_cache.flush()
cache.BingoCache.get().persist_to_datastore()
cache.BingoIdentityCache.persist_buckets_to_datastore()
finally:
# Always release the persist lock
lock.release()
# In production, at the end of every persist task, queue up the next one.
# An unbroken chain of persists should always be running.
if not os.environ["SERVER_SOFTWARE"].startswith('Development'):
queue_new_persist_task()
def persist_task():
"""Persist all gae/bingo cache entities to the datastore.
After persisting, this task should queue itself up for another run quickly
thereafter.
This function uses a lock to make sure that only one persist task
is running at a time.
"""
lock = PersistLock()
# Take the lock (only one persist should be running at a time)
if not lock.take():
logging.info("Skipping gae/bingo persist, persist lock already owned.")
return
logging.info("Persisting gae/bingo state from memcache to datastore")
try:
# Make sure request and instance caches are flushed, because this task
# doesn't go through the normal gae/bingo WSGI app which is wrapped in
# middleware. Regardless, we want to flush instance cache so that we're
# persisting the current shared memcache state of all exercises to the
# datastore.
request_cache.flush_request_cache()
instance_cache.flush()
cache.BingoCache.get().persist_to_datastore()
cache.BingoIdentityCache.persist_buckets_to_datastore()
finally:
# Always release the persist lock
lock.release()
# In production, at the end of every persist task, queue up the next one.
# An unbroken chain of persists should always be running.
if not os.environ["SERVER_SOFTWARE"].startswith("Development"):
queue_new_persist_task()
def flush_in_app_caches(self):
"""Flush in-app request and instance caches of gae/bingo state."""
request_cache.flush_request_cache()
instance_cache.flush()
def flush_in_app_caches(self):
"""Flush in-app request and instance caches of gae/bingo state."""
request_cache.flush_request_cache()
instance_cache.flush()
