生成雪花id

oa-ui/src/utils/snowFlake.js

@@ -0,0 +1,61 @@
+export var Snowflake = /** @class */ (function() {
+  function Snowflake(_workerId, _dataCenterId, _sequence) {
+      this.twepoch = 1288834974657n;
+      //this.twepoch = 0n;
+      this.workerIdBits = 5n;
+      this.dataCenterIdBits = 5n;
+      this.maxWrokerId = -1n ^ (-1n << this.workerIdBits); // 值为：31
+      this.maxDataCenterId = -1n ^ (-1n << this.dataCenterIdBits); // 值为：31
+      this.sequenceBits = 12n;
+      this.workerIdShift = this.sequenceBits; // 值为：12
+      this.dataCenterIdShift = this.sequenceBits + this.workerIdBits; // 值为：17
+      this.timestampLeftShift = this.sequenceBits + this.workerIdBits + this.dataCenterIdBits; // 值为：22
+      this.sequenceMask = -1n ^ (-1n << this.sequenceBits); // 值为：4095
+      this.lastTimestamp = -1n;
+      //设置默认值,从环境变量取
+      this.workerId = 1n;
+      this.dataCenterId = 1n;
+      this.sequence = 0n;
+      if (this.workerId > this.maxWrokerId || this.workerId < 0) {
+          throw new Error('_workerId must max than 0 and small than maxWrokerId-[' + this.maxWrokerId + ']');
+      }
+      if (this.dataCenterId > this.maxDataCenterId || this.dataCenterId < 0) {
+          throw new Error('_dataCenterId must max than 0 and small than maxDataCenterId-[' + this.maxDataCenterId + ']');
+      }
+
+      this.workerId = BigInt(_workerId);
+      this.dataCenterId = BigInt(_dataCenterId);
+      this.sequence = BigInt(_sequence);
+  }
+  Snowflake.prototype.tilNextMillis = function(lastTimestamp) {
+      var timestamp = this.timeGen();
+      while (timestamp <= lastTimestamp) {
+          timestamp = this.timeGen();
+      }
+      return BigInt(timestamp);
+  };
+  Snowflake.prototype.timeGen = function() {
+      return BigInt(Date.now());
+  };
+  Snowflake.prototype.nextId = function() {
+      var timestamp = this.timeGen();
+      if (timestamp < this.lastTimestamp) {
+          throw new Error('Clock moved backwards. Refusing to generate id for ' +
+              (this.lastTimestamp - timestamp));
+      }
+      if (this.lastTimestamp === timestamp) {
+          this.sequence = (this.sequence + 1n) & this.sequenceMask;
+          if (this.sequence === 0n) {
+              timestamp = this.tilNextMillis(this.lastTimestamp);
+          }
+      } else {
+          this.sequence = 0n;
+      }
+      this.lastTimestamp = timestamp;
+      return ((timestamp - this.twepoch) << this.timestampLeftShift) |
+          (this.dataCenterId << this.dataCenterIdShift) |
+          (this.workerId << this.workerIdShift) |
+          this.sequence;
+  };
+  return Snowflake;
+}());