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Tools and config for memcache related caching

Project description


This package combines the features from lovely.memcached and plone.memoize.ram. It provides a decorator and utility for Memcaches at EEA. The decorator allows you set dependencies known by lovely.memcached


This add-on doesn’t do anything by itself. It needs to be integrated by a developer within your own products. For reference you can check the package.



If you are using zc.buildout and the plone.recipe.zope2instance recipe to manage your project, you can do this:

  • Update your buildout.cfg file:

    parts +=
    effective-user = zope-www
    eggs =
    zcml =
    recipe = zc.recipe.cmmi
    url =
    recipe = zc.recipe.cmmi
    url =
    extra_options = --with-libevent=${libevent:location}
    recipe = lovely.recipe:mkfile
    path = ${buildout:bin-directory}/memcached
    mode = 0755
    content =
     export LD_LIBRARY_PATH=${libevent:location}/lib
        case "$1" in
           ${memcached:location}/bin/memcached -d -u ${buildout:effective-user} -P $PIDFILE
            kill `cat $PIDFILE`
            $0 stop
            sleep 1
            $0 start
            echo "Usage: $SCRIPTNAME {start|stop|restart}" >&2
            exit 1
  • Re-run buildout, e.g. with:

    $ bin/buildout -c buildout.cfg
  • Restart memcache and Zope:

    $ bin/memcached restart
    $ bin/instance restart


EEA Cache has the following dependencies:
  • Plone 4+
  • lovely.memcached

Source code

Latest source code (Zope 2 compatible):

Cache decorator

>>> def key(method, self):
...     return method.__name__
>>> from eea.cache import cache
>>> @cache(key, dependencies=["frontpage"])
... def myMethod(num):
...     return num*num

Lets clear any running memcache

>>> from lovely.memcached.event import InvalidateCacheEvent
>>> from zope.event import notify
>>> notify(InvalidateCacheEvent(raw=True, dependencies=['frontpage']))

Our myMethod will now be cached with the key returned from the method ‘key’ and with dependency ‘frontpage’.

>>> myMethod(2)
>>> myMethod(3)
>>> notify(InvalidateCacheEvent(raw=True, dependencies=['frontpage']))
>>> myMethod(3)

Cache lifetime

By default your content is cached in memcache for one hour (3600 seconds). You can change this by adding an int property within: ZMI > portal_properties > site_properties called memcached_defaultLifetime and set it’s value to 86400 (one day) for example.

Cache lifetime override per key

Starting with eea.cache 5.1 you can also pass a lifetime key with the duration in seconds which will override the defaultLifetime either given from the portal property or the default one from lovely.memcached of 3600 seconds

ex: in order to cache the result only for 4 minutes
>>> @cache(key, dependencies=["frontpage"], lifetime=240)
... def myMethod(num):
...     return num*num

Funding and project management

EEA - European Environment Agency (EU)


5.1 - (2013-02-04)

  • Feature: added ability to pass a lifetime key to the cache decorator in order to cache it for a determined period different from the default lifetime [ichimdav #13677]
  • Upgrade step: (optional) Within ZMI > portal_properties > site_properties add an int property called memcached_defaultLifetime and set it’s value to 86400 (one day) or any value that fits your needs.
  • Feature: Ability to set memcached default lifetime, which by now was hardcoded to one hour (3600 seconds) [voineali refs #13677]

5.0 - (2012-10-08)

  • Change: Updated README and egg’s metadata [voineali refs #5434]

4.3 - (2012-07-13)

  • Bug fix: fixed markup of HISTORY.txt file [ciobabog refs #5231]

4.2 - (2012-02-06)

  • no changes

4.0 - (2011-11-07)

  • Feature: Plone 4.x compatible release [ghicaale #4309]

0.3 - (2010-11-22)

  • Bug fix: fixed tests namespace in order to be used within hudson [voineali #3821]

0.2 - (2010-11-10)

  • Bug fix: added fake memcache client in order to fix broken doctests [voineali]

0.1 - (2009-11-10)

  • Initial release

Project details

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