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.
