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    1.0.6 • Public • Published

    Emiya Angular2 DataPool

    How to install

    npm install --save emiya-angular2-datapool


    • provide api to fetch data from remote address or local variable/promise
    • provide api to manage data (refresh/cache/destroy/update/notification)


    import {DataPool,DataPoolHandle} from "emiya-angular";
      template: `<ion-nav></ion-nav>`
    export class MyApp {
    constructor(platform: Platform, datapool: DataPool,) {
        //below we define 3 datapool with different data sources config
        //datapool 0 with fetching data from remote address
        var config0 = {
            id: '0',   //identity for datapool
            bind_tokens: ['uuid', 'token'],  //default is null,setting this means the datapool can only be accessed when token(uuid&token) exists 
            bind_tokens_method: ['local', 'local'], //use together with option bind_token to specify token source,option is local or session,default is local
            period: 3600, //the survival time from cached data,the unit is sec,value<0 means never expired.Once expired,the datapool will try to re-fetch data from sources.
            timeout: 6000,  //timeout of a data request,unit is mili-sec,value<0 means never timeout until the sources return or throw error
            request: {     //remote address config
             method: 'GET',   //request method(get/post/put/delete),default is get
             url: ''  //request address
             headers:{uuid:'dasklaslkfh313124124'} //additional added to request header
             params:{userid:'emiyalee'}   //url query params
             data:{password:'fasfgjal;sk2312412'}   //body params
             restful:{index:0}     //restful params,for example a request url like '/abc/:index/' will transform to '/abc/0/' 
            //transform the data structure after successful fetching data and before giving it to caller,support object or function definition 
             transform: {  //object definition
               userPhone: 'phone',  //transform phone to userphone
               read: 'readtime'  //transform readtime to read
             //or equal to
             transform: (org)=>{  //function
             delete org.readtime
              return org
            //all 3 options below means only when the data return from sources with payload(or header) structure like {data:{list:[{status:'ok'},{..}]}},the request is scueess,otherwise is a failure.
            condition_mode: 'payload',//header|payload   //optional,determine the success data flag path(header/payload) 
            condition_path: 'data.list.[0].status',//optional,determine the success data flag path
            condition_value: 'ok',//optional,determine the success data flag value,null means any value representing success,otherwise only value===condition_value means success
            //all 2 options below means when the request success,the datapool will give you data which from payload(or header),for example.if the payload structure is {data:[{abc:2,index:1},{..}],status:'ok'},you will get {abc:2,index:1} from datapool api
            receive_mode: 'payload',//header|payload
            receive_path: 'data.[0]'
          //datapool 1 with fetching data from local variable/function/promise
          var config1 = {
            id: '1',
            localData: {abc: 123,list:[{id:0},{id:1}]},
          //datapool 2 with fetching data from function
          var config2 = {
            id: '2',
            localData: ()=>{return {abc: 123,list:[{id:0},{id:1}]}},
          //datapool 3 with fetching data from promise
          var config3 = {
            id: '3',
            localData: new Promise((resolve,reject)=>{resolve({abc: 123,list:[{id:0},{id:1}]})}),
            //or equal to
            localData: ()=>{return new Promise((resolve,reject)=>{resolve({abc: 123,list:[{id:0},{id:1}]})})},
          //tell the datapool to load these configs
          //get datapool instance for 1(the id which you specify in
          let datapool0=datapool.request('1')  
          //read data from datapool
'abc').then((data)=>{do something}).catch((code)=>{do something})
>{do something}).catch((code)=>{do something})  //this will return all data to you
          datapool0.readByPath('list.[0].id').then((data)=>{do something}).catch((code)=>{do something}) //return 0 from object:{abc: 123,list:[{id:0},{id:1}]}
          //write data to datapool
          datapool0.write('abc0',{id:123})   //add new data abc0 to datapool with value {id:123} and then you can read it later,retrun promise
          datapool0.writeByPath('list.[2]',{id:123}) //new data will be {abc: 123,list:[{id:0},{id:1},{id:123}]}
          //remove data from datapool
          datapool0.remove()  //this will remove all data,return promise
          datapool0.removeByPath('list.[1]')  //new data will be {abc: 123,list:[{id:0}]}
          //force refresh datapool(re-fetch data from source)
          //get notification when data has been refresh or updated or deleted..
          let lis0=datapool0.onChange((ev)=>{do something},this)
          lis0() //unlisten to this event
          //check if you have the access to the datapool
          datapool0.checkValid() //true or false
          //global operation to all datapools
          datapool.refresh()  //force refresh all datapools(re-fetch data from source)
          let lis=datapool.onChange((ev)=>{do something},this)  //get notification when any data in any datapool has been refresh or updated or deleted..
          lis() //unlisten to this event
          //unload a specify datapool
          //unload all datapool
    datapool can also work with emiya-angular2-fetch,just replace request.url with the id you define in your fetch config.

    How to set and delete token

    import {Router} from 'emiya-angular2-token';
    export class TabsPage {
    constructor() {
        //set tokon
        //delete token
        //check if token exists
        Token.has('uuid')   //true or false
    more can be found emiya-angular2-token

    Global status code

    • -2 the datapool is disabled
    • -3 the payload or header return from source is null
    • -4 the responds from source is null
    • -5 fetching data from source fail
    • -6 request timeout
    • -7 datapool config is missing
    • -8 can not write value to datapool because key is not specified
    • -9 no data in the datapool
    • -10 trying to read an inexisted variable from datapool
    • -12 can not acccess the datapool because of token is not existed
    • -15 the payload or header structure fail to pass validation check
    • -20 the payload or header structure fail to pass validation check
    • -29 data source undefined or not found
    • -30 the payload or header return from source is null
    • -31 the payload or header return from source is null

    Api Referrences(todo..)


    npm i emiya-angular2-datapool

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