Add more complete caching support

[GoogleCodeExporter]

Right now the built-in caching mechanism has support for memcache. It'd be nice 
to implement 4 levels of caching, for views and for regular functions:

1. Google Edge cache (e.g. 'Cache-Control': 'public,max-age=60') [Views Only]
2. In Memory
3. Memcache
4. Datastore

Use case would be to decorate functions with a cache function and specify a 
cache level:
e.g

EDGE_CACHE = 0x1
LOCAL_CACHE = 0x2
MEM_CACHE = 0x4
DATASTORE_CACHE = 0x8

@cache(key, expiration, level=EDGE_CACHE|DATASTORE_CACHE)
def page_view(request):
....

Consideration for multi-threading would have to be taken into account for the 
local_memory cache as well as expiration times.

Django has this built-in feature: 
https://code.djangoproject.com/svn/django/trunk/django/core/cache/backends/locme
m.py

Original issue reported on code.google.com by someone1@gmail.com on 13 Mar 2012 at 6:36

[GoogleCodeExporter]

Original comment by paolo.ca...@gmail.com on 13 Mar 2012 at 6:58

• Added labels: Component-Logic, Milestone-Release2.3, Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

Original comment by paolo.ca...@gmail.com on 13 Jul 2012 at 4:17

• Added labels: Milestone-Release3.1
• Removed labels: Milestone-Release2.3