gluon.cfs 源代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
| This file is part of the web2py Web Framework
| Copyrighted by Massimo Di Pierro <mdipierro@cs.depaul.edu>
| License: LGPLv3 (http://www.gnu.org/licenses/lgpl.html)

Functions required to execute app components
--------------------------------------------

Note:
    FOR INTERNAL USE ONLY
"""

from os import stat
from gluon.fileutils import read_file
from gluon._compat import thread

cfs = {}  # for speed-up
cfs_lock = thread.allocate_lock()  # and thread safety


[文档]def getcfs(key, filename, filter=None): """ Caches the *filtered* file `filename` with `key` until the file is modified. Args: key(str): the cache key filename: the file to cache filter: is the function used for filtering. Normally `filename` is a .py file and `filter` is a function that bytecode compiles the file. In this way the bytecode compiled file is cached. (Default = None) This is used on Google App Engine since pyc files cannot be saved. """ try: t = stat(filename).st_mtime except OSError: return filter() if callable(filter) else '' cfs_lock.acquire() item = cfs.get(key, None) cfs_lock.release() if item and item[0] == t: return item[1] if not callable(filter): data = read_file(filename) else: data = filter() cfs_lock.acquire() cfs[key] = (t, data) cfs_lock.release() return data