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cascade-client

v4.0.3

Published

## fetcher

Downloads

7

Readme

cascade-client

fetcher

fetcher是表示一个获取数据的接口,它实现fetch(fields) 方法

它的实现有:

  • LocalFetcher: 是用本地数据来模拟后端的cascade返回
import {LocalFetcher} from 'cascade-client'
var fetcher = new LocalFetcher({
    // type
    User: {
        // category
        query: { // return value
            name: 'Jay'
        }
    }
});
var fetcher = new (require('cascade-fetcher-dpapp'))('https://a.dper.com/shd/query');
var fetcher = new (require('cascade-fetcher-http'))('https://a.dper.com/shd/query');

decorator

decorator会对传入的fetcher附加一些功能 他的实现有:

  • Combiner: 可以合并一定时间段内的cascade请求
var Combiner = import {Combiner} from 'cascade-client';
var cascade = new Combiner(fetcher, {
    wait: 100 // 合并100ms内的请求
})
  • ErrorRejector: 可以把返回数据里面的错误提取出来,走到异常处理流程
var ErrorRejector = import 'ErrorRejector' from 'cascade-client';
var cascade = new ErrorRejector(fetcher);
  • Cacher: 可以缓存type或者type+category,缓存使用 type + category + params 作为key。只缓存没有children的根节点数据。
var Cacher = import {Cacher} from 'cascade-client';
var cascade = new Cacher(fetcher, {
    fields: [{type: 'User'}]
})

组合起来

import {Cascade, LocalFetcher, Combiner} from 'cascade-client';
import Fetcher from 'cascade-fetcher-http'

let cascade = location.href.indexOf('localhost') !== -1 ? new LocalFetcher({
    User: {
        query: {
            name: 'Jay'
        }
    }
}) : new Combiner(new Fetcher('https://a.dper.com/shd/query'));


// query 方法返回一个promise
cascade.fetch([{type:'User'}]).then(function(data) {
    console.log(data)
})

服务端

cascade-java