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Metadata-Version: 1.1
Name: dogpile.cache
Version: 0.5.4
Summary: A caching front-end based on the Dogpile lock.
Home-page: http://bitbucket.org/zzzeek/dogpile.cache
Author: Mike Bayer
Author-email: mike_mp@zzzcomputing.com
License: BSD
Description: dogpile.cache
        =============
        
        A caching API built around the concept of a "dogpile lock", which allows
        continued access to an expiring data value while a single thread generates a
        new value.
        
        dogpile.cache builds on the `dogpile.core <http://pypi.python.org/pypi/dogpile.core>`_
        locking system, which implements the idea of "allow one creator to write while
        others read" in the abstract.   Overall, dogpile.cache is intended as a
        replacement to the `Beaker <http://beaker.groovie.org>`_ caching system, the internals
        of which are written by the same author.   All the ideas of Beaker which "work"
        are re-implemented in dogpile.cache in a more efficient and succinct manner,
        and all the cruft (Beaker's internals were first written in 2005) relegated
        to the trash heap.
        
        Features
        --------
        
        * A succinct API which encourages up-front configuration of pre-defined
          "regions", each one defining a set of caching characteristics including
          storage backend, configuration options, and default expiration time.
        * A standard get/set/delete API as well as a function decorator API is
          provided.
        * The mechanics of key generation are fully customizable.   The function
          decorator API features a pluggable "key generator" to customize how
          cache keys are made to correspond to function calls, and an optional
          "key mangler" feature provides for pluggable mangling of keys
          (such as encoding, SHA-1 hashing) as desired for each region.
        * The dogpile lock, first developed as the core engine behind the Beaker
          caching system, here vastly simplified, improved, and better tested.
          Some key performance
          issues that were intrinsic to Beaker's architecture, particularly that
          values would frequently be "double-fetched" from the cache, have been fixed.
        * Backends implement their own version of a "distributed" lock, where the
          "distribution" matches the backend's storage system.  For example, the
          memcached backends allow all clients to coordinate creation of values
          using memcached itself.   The dbm file backend uses a lockfile
          alongside the dbm file.  New backends, such as a Redis-based backend,
          can provide their own locking mechanism appropriate to the storage
          engine.
        * Writing new backends or hacking on the existing backends is intended to be
          routine - all that's needed are basic get/set/delete methods. A distributed
          lock tailored towards the backend is an optional addition, else dogpile uses
          a regular thread mutex. New backends can be registered with dogpile.cache
          directly or made available via setuptools entry points.
        * Included backends feature three memcached backends (python-memcached, pylibmc,
          bmemcached), a Redis backend, a backend based on Python's
          anydbm, and a plain dictionary backend.
        * Space for third party plugins, including the first which provides the
          dogpile.cache engine to Mako templates.
        * Python 3 compatible in place - no 2to3 required.
        
        Synopsis
        --------
        
        dogpile.cache features a single public usage object known as the ``CacheRegion``.
        This object then refers to a particular ``CacheBackend``.   Typical usage
        generates a region using ``make_region()``, which can then be used at the
        module level to decorate functions, or used directly in code with a traditional
        get/set interface.   Configuration of the backend is applied to the region
        using ``configure()`` or ``configure_from_config()``, allowing deferred
        config-file based configuration to occur after modules have been imported::
        
            from dogpile.cache import make_region
        
            region = make_region().configure(
                'dogpile.cache.pylibmc',
                expiration_time = 3600,
                arguments = {
                    'url':["127.0.0.1"],
                    'binary':True,
                    'behaviors':{"tcp_nodelay": True,"ketama":True}
                }
            )
        
            @region.cache_on_arguments()
            def load_user_info(user_id):
                return some_database.lookup_user_by_id(user_id)
        
        
        Documentation
        -------------
        
        See dogpile.cache's full documentation at
        `dogpile.cache documentation <http://dogpilecache.readthedocs.org>`_.
        
        
        
        
        
        
Keywords: caching
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3