func (ls *Libstore) checkWhetherLeaseNeeded(args *storageproto.GetArgs, key string) {
if ls.flags == ALWAYS_LEASE {
args.WantLease = true
args.LeaseClient = ls.cacheCallbackHostPort
} else if ls.cacheCallbackHostPort == "" {
args.WantLease = false
} else {
ls.requestsLocker.Lock()
if ls.requests[key] == nil {
lsplog.Vlogf(3, "[checkWhetherLeaseNeeded] First requested")
req := &Request{1, time.Now().Add(time.Duration(storageproto.QUERY_CACHE_SECONDS) * time.Second)}
ls.requests[key] = req
} else {
req := ls.requests[key]
if time.Now().Before(req.ts) {
req.frequency = req.frequency + 1
if req.frequency >= storageproto.QUERY_CACHE_THRESH {
lsplog.Vlogf(3, "[checkWhetherLeaseNeeded] Going to ask for a lease")
args.LeaseClient = ls.cacheCallbackHostPort
args.WantLease = true
} else {
args.WantLease = false
}
} else {
delete(ls.requests, key)
args.WantLease = false
}
}
ls.requestsLocker.Unlock()
}
}
