page-splicing

Splicing data in different backend system, a common problem in BFF layer. Using Duty Chain to make it easy for extension.

解决BFF层常见了多后端系统分页拼接问题。利用职责链提供符合开闭原则的分页拼接方案。

Install

$ npm install page-splicing

How to use

tips: the interface to get data from backend should support search by offset(related to primary key or index)

获取后端数据的接口需要支持偏移量查询(这个偏移量可以被计算为主键或数据索引)

import PageSplicing from 'page-splicing';
import rp from 'rp'

const getData = async function (currentPage, pageSize) {
  const firstSystemData = async (param) => {
    return await rp({ url: 'domainA.com/getData', qs: param });
  }
  const firstSystemDataCount = async (param) => {
    return await rp({ url: 'domainA.com/getCount', qs: param });
  }

  const secondSystemData = async (param) => {
    return await rp({ url: 'domainB.com/getData', qs: param });
  }

  const secondSystemDataCount = async (param) => {
    return await rp({ url: 'domainB.com/getCount', qs: param });
  }    
  const handler = (getData, getCount) => PageSplicing.utils.pagingLogic(getData, getCount);
  PageSplicing
    .next(handler(firstSystemData, firstSystemDataCount))
    .next(handler(secondSystemData, secondSystemDataCount));
  return await PageSplicing.start(currentPage, pageSize);
}

const data = await getData(1, 10);