TileStache.Memcache module

Caches tiles to Memcache.

Requires python-memcached:

http://pypi.python.org/pypi/python-memcached

Example configuration:

“cache”: {

“name”: “Memcache”, “servers”: [“127.0.0.1:11211”], “revision”: 0, “key prefix”: “unique-id”

}

Memcache cache parameters:

servers

Optional array of servers, list of “{host}:{port}” pairs. Defaults to [“127.0.0.1:11211”] if omitted.

revision

Optional revision number for mass-expiry of cached tiles regardless of lifespan. Defaults to 0.

key prefix

Optional string to prepend to Memcache generated key. Useful when running multiple instances of TileStache that share the same Memcache instance to avoid key collisions. The key prefix will be prepended to the key name. Defaults to “”.

class TileStache.Memcache.Cache(servers=['127.0.0.1:11211'], revision=0, key_prefix='')

lock(layer, coord, format)

Acquire a cache lock for this tile.

Returns nothing, but blocks until the lock has been acquired.

read(layer, coord, format)

Read a cached tile.

remove(layer, coord, format)

Remove a cached tile.

save(body, layer, coord, format)

Save a cached tile.

unlock(layer, coord, format)

Release a cache lock for this tile.

TileStache.Memcache.tile_key(layer, coord, format, rev, key_prefix)

Return a tile key string.