class PhotoCache:
def __init__(self, maxLen):
self.l = ReadWriteLock()
self.nextT = int((time() - 1312742671) * 4)
self.maxLen = maxLen
self.m = {}
self.s = []
def update(self, photoId, data):
self.l.acquireWrite()
if photoId in self.m:
oldT, oldData = self.m[photoId]
data['tagging_id'] = oldData['tagging_id']
newInfo = (oldT, data)
else:
data['tagging_id'] = self.nextT
newInfo = (self.nextT, data)
self.nextT = self.nextT + 1
self.s.append(photoId)
if len(self.s) > self.maxLen:
self.s.pop(0)
self.m[photoId] = newInfo
self.l.release()
return newInfo
def dumpLatest(self, n):
self.l.acquireRead()
print >> sys.stderr, map(lambda photoId: self.m[photoId][1]['tagging_id'], self.s[-n:])
self.l.release()
def getLatest(self, n):
self.l.acquireRead()
output = []
for photoId in self.s[-n:]:
output.append(self.m[photoId][1])
self.l.release()
return output
