mirror of
https://github.com/sofastack/sofa-rpc-node.git
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30 lines
647 B
JavaScript
30 lines
647 B
JavaScript
'use strict';
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const MAX_PACKET_ID = Math.pow(2, 30); // 避免 hessian 写大整数
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/**
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* 创建全局唯一的 packetId
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* @return {Number} packetId
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*/
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exports.nextId = () => {
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exports.id += 1;
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if (exports.id >= MAX_PACKET_ID) {
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exports.id = 1;
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}
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return exports.id;
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};
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exports.id = 0;
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/* eslint-disable no-bitwise */
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exports.shuffle = arr => {
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let n = arr.length;
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let random;
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while (n) {
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random = (Math.random() * n--) >>> 0; // 无符号右移位运算符向下取整
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[ arr[n], arr[random] ] = [ arr[random], arr[n] ]; // ES6的结构赋值实现变量互换
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}
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return arr;
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};
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/* eslint-enable no-bitwise */
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