LargeLocalStorageControl

gistfile1.js

define(function(require, exports, module){
  var $ = require('jquery');
  $.ajaxSettings.async = false;
  var LargeLocalStorage = require('largeLocalStorage/largeLocalStorage');
  // for debug : window.lls = LargeLocalStorage;

  /**
   *get Local Data 获取数据
   * @param {String} name
   * @returns {JSON}
   */
  exports.getData = function(name){
    var value = null;
    var storage = new LargeLocalStorage({
      size: 20 * 1024 * 1024,
      name: 'lls-ezts-db'
    });
    storage.initialized.then(function(){
      storage.getContents(name, {json: true}).then(function(contents){
        value = content;
      }).then(function(contents){
        /**
         * local data unavailable  本地缓存数据不存在
         */
        if(typeof (contents) == "undefined" || contents == null){
          console.log('1.1：local data unavailable 本地无数据');
          var refer = getLocalStoreControlByName(name);
          if(refer){
            $.getJSON(refer.url, function(result){
              storage.setContents(name, result, {json: true});
              storage.setContents(name + '-update-time', refer.update_time);
              value = result;
              return value;
              console.log('1.2：Server data request success 数据请求成功');
            });
          }
          console.log('1.3：get server data success 数据获取成功');
          /**
           * 本地缓存数据存在
           */
        }else{
          var update_time = storage.getContents(name + '-update-time');
          var refer = getLocalStoreControlByName(name);
          /**
           * Update local data which is expired 本地缓存数据过期，更新缓存
           */
          if(typeof (update_time) == "undefined" || update_time < refer.update_time){
            console.log('2.1：local data expired 本地缓存数据过期');
            $.getJSON(refer.url, function(result){
              storage.setContents(name, result, {json: true});
              storage.setContents(name + '-update-time', refer.update_time);
              value = result;
              return value;
            });
          }else{
            console.log('3.1： local data available 本地缓存数据可用');
            console.log('3.2：local data is 本地缓存数据为' + value);
            value = contents;
            return contents;
          }
        }
      });
    });
    console.info('4:end 结束：' + value);
    return value;
  };
  /**
   * 查找缓存控制对照表
   * @param {String} name
   * @returns {Object}
   */
  function getLocalStoreControlByName(name){
    var dict = window.localStorageControl;
    for(var i = 0; i < dict.length; i++){
      if(dict[i].name == name){
        return dict[i];
      }
    }
  }
});

eg:
localStorageControl = [{"id":"1","name":"getUserList","update_time":"1414034724","url":"/lsc/combo/func/getUserList"},{"id":"17","name":"getDbTypeList","update_time":"1414034724","url":"/lsccombo/func/getDbTypeList"}]