Source code for google.appengine.api.runtime.runtime

#!/usr/bin/env python
# Copyright 2007 Google Inc.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.

"""Runtime Utilities API.

.. deprecated:: 1.8.1

Utilities for interacting with the Python Runtime."""

from __future__ import with_statement

import threading

from google.appengine.api import apiproxy_stub_map
from google.appengine.api.system import system_service_pb

[docs]def cpu_usage(): """Returns a SystemStat describing cpu usage, expressed in mcycles. The returned object has the following accessors: - total(): total mcycles consumed by this instance - rate1m(): average mcycles consumed per second over the last minute - rate10m(): average mcycles consumed per second over the last ten minutes Functions for converting from mcycles to cpu-seconds are located in the quotas API. """ return _GetSystemStats().cpu()
[docs]def memory_usage(): """Returns a SystemStat describing memory usage, expressed in MB. The returned object has the following accessors: - current(): memory currently used by this instance - average1m(): average memory use, over the last minute - average10m(): average memory use, over the last ten minutes """ return _GetSystemStats().memory()
def _GetSystemStats(): """Returns stats about the current instance.""" request = system_service_pb.GetSystemStatsRequest() response = system_service_pb.GetSystemStatsResponse() apiproxy_stub_map.MakeSyncCall('system', 'GetSystemStats', request, response) return response __shutdown_mutex = threading.Lock() __shutdown_hook = None __shuting_down = False
[docs]def is_shutting_down(): """Returns true if the server is shutting down.""" with __shutdown_mutex: shutting_down = __shuting_down return shutting_down
[docs]def set_shutdown_hook(hook): """Registers a function to be called when the server is shutting down. The shutdown hook will be called when the server shuts down. Your code will have a short amount of time to save state and exit. The shutdown hook should interrupt any long running code you have, e.g. by calling apiproxy_stub_map.apiproxy.CancelApiCalls and/or raising an exception. Args: hook: A no-argument callable which will be called when the server is shutting down. Returns: The previously registered shutdown hook, or None if no hook was registered before. In some cases it may not be possible to run the shutdown hook before the server exits. """ if hook is not None and not callable(hook): raise TypeError("hook must be callable, got %s" % hook.__class__) global __shutdown_hook with __shutdown_mutex: old_hook = __shutdown_hook __shutdown_hook = hook return old_hook
def __BeginShutdown(): global __shuting_down with __shutdown_mutex: __shuting_down = True shutdown_hook = __shutdown_hook if shutdown_hook: shutdown_hook()

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