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package snowflake
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import "time"
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type Method byte
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const (
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MethodSnowflakeOffset Method = iota + 1
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MethodSnowflake
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)
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type Options struct {
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Method Method // 雪花计算方法,(1-漂移算法|2-传统算法),默认1
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BaseTime int64 // 基础时间(ms单位),不能超过当前系统时间
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WorkerId uint16 // 机器码,必须由外部设定,最大值 2^WorkerIdBitLength-1
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WorkerIdBitLength byte // 机器码位长,默认值6,取值范围 [1, 15](要求:序列数位长+机器码位长不超过22)
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SeqBitLength byte // 序列数位长,默认值6,取值范围 [3, 21](要求:序列数位长+机器码位长不超过22)
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MaxSeqNumber uint32 // 最大序列数(含),设置范围 [MinSeqNumber, 2^SeqBitLength-1],默认值0,表示最大序列数取最大值(2^SeqBitLength-1])
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MinSeqNumber uint32 // 最小序列数(含),默认值5,取值范围 [5, MaxSeqNumber],每毫秒的前5个序列数对应编号0-4是保留位,其中1-4是时间回拨相应预留位,0是手工新值预留位
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TopOverCostCount uint32 // 最大漂移次数(含),默认2000,推荐范围500-10000(与计算能力有关)
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}
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var defaultOptions = &Options{
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Method: MethodSnowflakeOffset,
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BaseTime: time.Date(2022, time.February, 1, 0, 0, 0, 0, time.Local).UnixNano() / 1e6, // 2022-01-01 00:00:00 local
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WorkerId: 1,
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WorkerIdBitLength: 6,
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SeqBitLength: 16, // 50w并发建议10 500w建议14-16
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MaxSeqNumber: 0,
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MinSeqNumber: 5,
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TopOverCostCount: 5000, // 500w并发建议5000-8000
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}
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func NewOptions(workerId uint16) *Options {
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return &Options{
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WorkerId: workerId,
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Method: defaultOptions.Method,
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BaseTime: defaultOptions.BaseTime,
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WorkerIdBitLength: defaultOptions.WorkerIdBitLength,
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SeqBitLength: defaultOptions.SeqBitLength,
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MaxSeqNumber: defaultOptions.MaxSeqNumber,
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MinSeqNumber: defaultOptions.MinSeqNumber,
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TopOverCostCount: defaultOptions.TopOverCostCount,
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}
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}
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