func (peer *testPeer) Get(group, key string) (*rs.Resource, error) {
response := rs.New([]byte(key))
peer.hitCnt++
return response, nil
}
func (c *cache) set(key string, value []byte) *rs.Resource {
c.lock.Lock()
defer c.lock.Unlock()
res := rs.New(value)
c.lru.Set(key, res)
c.nBytes += uint64(len(key) + len(value))
return res
}