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Property caching

Project description

# Property caching

[![Build Status](https://travis-ci.org/yola/property-caching.png)](https://travis-ci.org/yola/property-caching)

Cached version of property

Written and used by the folks at Yola to support our [free website builder][1].

## Overview

- `cached_property` - stores results of decorated methods in decorated object
(in `_cached_properties` attribute)
- `class_cached_property` - stores results of decorated methods in the class of decorated object
(in `_class_cached_properties` attribute). All instances will share cached value.
- `clear_property_cache` - deletes cached value (works for object cached properties only)
- `set_property_cache` - explicitly sets property cache (works for object cached properties only)
- `is_property_cached` - allows to check whether property was cached or not (works for object cached properties only)

## Usage
```python
from property_caching import (cached_property,
class_cached_property,
clear_property_cache,
set_property_cache)

class Dummy:
@cached_property
def foo(self):
return self.service.expensive_operation()

@class_cached_property
def service(self):
return expensive_service_initialization()

d = Dummy()
d.foo # calculates result and stores it in d._cached_properties
d.foo # uses cached value

clear_property_cache(d, 'foo') # clears cache for property `foo`
set_property_cache(d, 'foo', 42) # explicitly set cache for property `foo`

d2 = Dummy()
d2.foo # re-calculates value of `foo` but uses cached service
```

## Testing

Install development requirements:

pip install -r requirements.txt

Run the tests with:

nosetests

[1]:https://www.yola.com/

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