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# BSD Licensed, Copyright (c) 2006-2010 TileCache Contributors
from TileCache.Cache import Cache
import time
class Memcached(Cache):
def __init__ (self, servers = ['127.0.0.1:11211'], **kwargs):
Cache.__init__(self, **kwargs)
import memcache
if type(servers) is str: servers = map(str.strip, servers.split(","))
self.cache = memcache.Client(servers, debug=0)
def getKey(self, tile):
return "/".join(map(str, [tile.layer.name, tile.x, tile.y, tile.z]))
def get(self, tile):
key = self.getKey(tile)
tile.data = self.cache.get(key)
return tile.data
def set(self, tile, data):
if self.readonly: return data
key = self.getKey(tile)
self.cache.set(key, data)
return data
def delete(self, tile):
key = self.getKey(tile)
self.cache.delete(key)
def attemptLock (self, tile):
return self.cache.add( self.getLockName(tile), "0",
time.time() + self.timeout)
def unlock (self, tile):
self.cache.delete( self.getLockName(tile) )
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