text: const assert = require('assert');
  
  function Fetcher(context, pageNum) {
    assert(context);
    assert(pageNum);
    this._context = context;
    this._pageNum = pageNum;
  }
  
  Fetcher.prototype.retrieve = function retrieve() {
    return this._context.getStorage().read(this._pageNum);
  };
  
  module.exports = Fetcher;
  