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cached_property.py	3.81 KB	-rw-r--r--
easy_install.py	126 B	-rw-r--r--
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Code Editor : cached_property.py

# -*- coding: utf-8 -*-

__author__ = 'Daniel Greenfeld'
__email__ = 'pydanny@gmail.com'
__version__ = '1.3.0'
__license__ = 'BSD'

from time import time
import threading

class cached_property(object):
    """
    A property that is only computed once per instance and then replaces itself
    with an ordinary attribute. Deleting the attribute resets the property.
    Source: https://github.com/bottlepy/bottle/commit/fa7733e075da0d790d809aa3d2f53071897e6f76
    """  # noqa

def __init__(self, func):
        self.__doc__ = getattr(func, '__doc__')
        self.func = func

def __get__(self, obj, cls):
        if obj is None:
            return self
        value = obj.__dict__[self.func.__name__] = self.func(obj)
        return value

class threaded_cached_property(object):
    """
    A cached_property version for use in environments where multiple threads
    might concurrently try to access the property.
    """

def __init__(self, func):
        self.__doc__ = getattr(func, '__doc__')
        self.func = func
        self.lock = threading.RLock()

def __get__(self, obj, cls):
        if obj is None:
            return self

obj_dict = obj.__dict__
        name = self.func.__name__
        with self.lock:
            try:
                # check if the value was computed before the lock was acquired
                return obj_dict[name]
            except KeyError:
                # if not, do the calculation and release the lock
                return obj_dict.setdefault(name, self.func(obj))

class cached_property_with_ttl(object):
    """
    A property that is only computed once per instance and then replaces itself
    with an ordinary attribute. Setting the ttl to a number expresses how long
    the property will last before being timed out.
    """

def __init__(self, ttl=None):
        if callable(ttl):
            func = ttl
            ttl = None
        else:
            func = None
        self.ttl = ttl
        self._prepare_func(func)

def __call__(self, func):
        self._prepare_func(func)
        return self

def __get__(self, obj, cls):
        if obj is None:
            return self

now = time()
        obj_dict = obj.__dict__
        name = self.__name__
        try:
            value, last_updated = obj_dict[name]
        except KeyError:
            pass
        else:
            ttl_expired = self.ttl and self.ttl < now - last_updated
            if not ttl_expired:
                return value

value = self.func(obj)
        obj_dict[name] = (value, now)
        return value

def __delete__(self, obj):
        obj.__dict__.pop(self.__name__, None)

def __set__(self, obj, value):
        obj.__dict__[self.__name__] = (value, time())

def _prepare_func(self, func):
        self.func = func
        if func:
            self.__doc__ = func.__doc__
            self.__name__ = func.__name__
            self.__module__ = func.__module__

# Aliases to make cached_property_with_ttl easier to use
cached_property_ttl = cached_property_with_ttl
timed_cached_property = cached_property_with_ttl

class threaded_cached_property_with_ttl(cached_property_with_ttl):
    """
    A cached_property version for use in environments where multiple threads
    might concurrently try to access the property.
    """

def __init__(self, ttl=None):
        super(threaded_cached_property_with_ttl, self).__init__(ttl)
        self.lock = threading.RLock()

def __get__(self, obj, cls):
        with self.lock:
            return super(threaded_cached_property_with_ttl, self).__get__(obj,
                                                                          cls)

# Alias to make threaded_cached_property_with_ttl easier to use
threaded_cached_property_ttl = threaded_cached_property_with_ttl
timed_threaded_cached_property = threaded_cached_property_with_ttl

${this.title}

Code Editor : cached_property.py