func (ss *storageServer) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
if !ss.IsKeyInRange(args.Key) {
reply.Status = storagerpc.WrongServer
return nil
}
ss.lockForTableLocks.Lock()
/* Lock table for writing */
lock, exist := ss.tableLocks[args.Key]
if !exist {
lock = new(sync.Mutex)
ss.tableLocks[args.Key] = lock
}
ss.lockForTableLocks.Unlock()
lock.Lock()
defer lock.Unlock()
ss.RevokeLease(args.Key)
_, exist = ss.stringTable[args.Key]
if !exist {
reply.Status = storagerpc.KeyNotFound
} else {
delete(ss.stringTable, args.Key)
reply.Status = storagerpc.OK
}
return nil
}
func (ss *storageServer) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
key := args.Key
if !correctServer(ss, key) {
reply.Status = storagerpc.WrongServer
return nil
}
leases := getLeases(ss, key)
if leases != nil {
ss.editLock.Lock()
revokeLease(ss, key)
ss.editLock.Unlock()
}
ss.valMapLock.Lock()
defer ss.valMapLock.Unlock()
_, in := ss.valMap[key]
if !in {
reply.Status = storagerpc.KeyNotFound
} else {
delete(ss.valMap, key)
reply.Status = storagerpc.OK
}
return nil
}
// Delete remove the specified key from the data store.
// If the key does not fall within the storage server's range,
// it should reply with status WrongServer.
// If the key is not found, it should reply with status KeyNotFound.
func (ss *storageServer) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
// fmt.Println("Delete function Called",args)
if FindPartitionNode(ss.ring, args.Key).NodeID != ss.nodeID {
reply.Status = storagerpc.WrongServer
return nil
}
// lock the whole storage first
ss.sMutex.Lock()
defer ss.sMutex.Unlock()
// retrieve the data unit
data, ok := ss.storage[args.Key]
if ok {
reply.Status = storagerpc.OK
data.dMutex.Lock()
// WARNING: here we might meet the situation of wild pointer.
// that is the value is already deleted from the map, but the
ss.RevokeCallBacksForKey(args.Key, data)
data.dMutex.Unlock()
// aplly changes
delete(ss.storage, args.Key)
return nil
} else {
reply.Status = storagerpc.KeyNotFound
return nil
}
return nil
}
func (ss *storageServer) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
if ss.isReady == false {
reply.Status = storagerpc.NotReady
} else {
if ss.getServerID(args.Key) != ss.nodeID {
reply.Status = storagerpc.WrongServer
return nil
}
ss.serverMutex.Lock()
if ss.userValueMutex[args.Key] == nil {
ss.userValueMutex[args.Key] = &sync.Mutex{}
}
ss.serverMutex.Unlock()
ss.userValueMutex[args.Key].Lock()
defer ss.userValueMutex[args.Key].Unlock()
_, exist := ss.userValue[args.Key]
if exist == false {
reply.Status = storagerpc.KeyNotFound
} else {
// revoke all leases if already exist in server before
err := ss.revokeLease(args.Key, ss.userValueLease[args.Key])
if err != nil {
return err
}
ss.userValueLease[args.Key] = make(map[string]*lease)
reply.Status = storagerpc.OK
delete(ss.userValue, args.Key)
}
}
return nil
}
func (ss *storageServer) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
if DBG {
fmt.Println("Entered storageserver delete")
}
if !ss.inRange(libstore.StoreHash(args.Key)) {
reply.Status = storagerpc.WrongServer
return nil
}
_, ok := ss.dataStore[args.Key]
if !ok {
reply.Status = storagerpc.KeyNotFound
return nil
}
// Leasing check
ss.leaseLock.Lock()
pendingModifications, ok := ss.pendingMap[args.Key]
if !ok {
reply.Status = storagerpc.KeyNotFound
ss.leaseLock.Unlock()
return nil
}
pendingModifications.pending++
leaseHolders, ok := ss.leaseStore[args.Key]
ss.leaseLock.Unlock()
if pendingModifications.pending > 1 { // Block until it's our turn to modify key
response := make(chan int)
pendingModifications.pendingCh <- response
<-response
}
if ok {
ss.revokeLeases(leaseHolders, args.Key)
}
ss.dataLock.Lock()
delete(ss.dataStore, args.Key)
ss.dataLock.Unlock()
reply.Status = storagerpc.OK
pendingModifications.pending--
Loop:
for {
select {
case ch := <-pendingModifications.pendingCh:
ch <- 1
break Loop
default:
break Loop
}
}
return nil
}
func (ss *storageServer) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
if args == nil {
return errors.New("ss: Can't delete nil K/V pair")
}
if reply == nil {
return errors.New("ss: Can't reply with nil in Delete")
}
if !(ss.CheckKeyInRange(args.Key)) {
reply.Status = storagerpc.WrongServer
return nil
}
ss.sMutex.Lock()
keyLock, exist := ss.keyLockMap[args.Key]
if !exist {
// Create new lock for the key
keyLock = &sync.Mutex{}
ss.keyLockMap[args.Key] = keyLock
}
ss.sMutex.Unlock()
keyLock.Lock()
defer keyLock.Unlock()
_, ok := ss.sMap[args.Key]
if !ok {
reply.Status = storagerpc.KeyNotFound
return nil
}
hpTimeMap, leaseExists := ss.leaseMap[args.Key]
if leaseExists {
// Revoke all issued leases.
successChan := make(chan int, 1)
finishChan := make(chan int, 1)
expected := len(hpTimeMap)
go ss.CheckRevokeStatus(args.Key, successChan, finishChan, expected)
for hp, _ := range hpTimeMap {
go ss.RevokeLeaseAt(hp, args.Key, successChan)
}
<-finishChan
delete(ss.leaseMap, args.Key)
}
delete(ss.sMap, args.Key)
reply.Status = storagerpc.OK
return nil
}
func (pc *proxyCounter) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
if pc.override {
reply.Status = pc.overrideStatus
return pc.overrideErr
}
byteCount := len(args.Key)
err := pc.srv.Call("StorageServer.Delete", args, reply)
atomic.AddUint32(&pc.rpcCount, 1)
atomic.AddUint32(&pc.byteCount, uint32(byteCount))
return err
}
func (ss *storageServer) Delete(args *storagerpc.DeleteArgs, reply *storagerpc.DeleteReply) error {
key := args.Key
if rightStorageServer(ss, key) == false {
reply.Status = storagerpc.WrongServer
return nil
}
if _, found := ss.keyLocks[key]; found == false {
ss.keyLocks[key] = make(chan int, 1)
} else {
<-ss.keyLocks[key]
}
if _, found := ss.topMap[key]; found {
delete(ss.topMap, key)
reply.Status = storagerpc.OK
} else {
reply.Status = storagerpc.KeyNotFound
}
ss.keyLocks[key] <- 1
return nil
}
