47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
class Snowflake {
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constructor(machineId) {
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if (machineId < 0 || machineId >= 1024) {
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throw new Error("Machine ID must be in the range 0-1023.");
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}
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this.machineId = BigInt(machineId);
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this.sequence = BigInt(0);
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this.lastTimestamp = BigInt(-1);
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this.timestampShift = 22n;
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this.machineIdShift = 12n;
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this.sequenceMask = 0xfffn;
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}
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async generate() {
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let timestamp = BigInt(Date.now());
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if (timestamp === this.lastTimestamp) {
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this.sequence = (this.sequence + 1n) & this.sequenceMask;
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if (this.sequence === 0n) {
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while (timestamp <= this.lastTimestamp) {
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await new Promise((resolve) => setTimeout(resolve, 1));
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timestamp = BigInt(Date.now());
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}
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}
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} else {
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this.sequence = 0n;
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}
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this.lastTimestamp = timestamp;
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const id =
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((timestamp & 0x1ffffffffffn) << this.timestampShift) |
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(this.machineId << this.machineIdShift) |
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this.sequence;
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return id.toString();
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}
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}
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const machineId = 1; // machine ID (0-1023)
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const snowflake = new Snowflake(machineId);
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const id1 = snowflake.generate();
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console.log(id1);
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