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package sequence
import ( "fmt" "hash/fnv"
"github.com/bwmarrin/snowflake" "github.com/chrislusf/seaweedfs/weed/glog" )
// a simple snowflake Sequencer
type SnowflakeSequencer struct { node *snowflake.Node }
func NewSnowflakeSequencer(nodeid string) (*SnowflakeSequencer, error) { nodeid_hash := hash(nodeid) & 0x3ff glog.V(0).Infof("use snowfalke seq id generator, nodeid:%s hex_of_nodeid: %x", nodeid, nodeid_hash) node, err := snowflake.NewNode(int64(nodeid_hash)) if err != nil { fmt.Println(err) return nil, err }
sequencer := &SnowflakeSequencer{node: node} return sequencer, nil }
func hash(s string) uint32 { h := fnv.New32a() h.Write([]byte(s)) return h.Sum32() }
func (m *SnowflakeSequencer) NextFileId(count uint64) uint64 { return uint64(m.node.Generate().Int64()) }
// ignore setmax as we are snowflake
func (m *SnowflakeSequencer) SetMax(seenValue uint64) { }
// return a new id as no Peek is stored
func (m *SnowflakeSequencer) Peek() uint64 { return uint64(m.node.Generate().Int64()) }
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