D-Net

import { NgModule } from '@angular/core';

import { FormsModule } from '@angular/forms';

import { RouterModule } from '@angular/router';

import { UniversalModule, isBrowser, isNode, AUTO_PREBOOT } from 'angular2-universal/browser'; // for AoT we need to manually split universal packages

import { AppModule, AppComponent } from './app/app.module';

import { SharedModule } from './app/shared/shared.module';

import { CacheService } from './app/shared/cache.service';

// Will be merged into @angular/platform-browser in a later release

// see https://github.com/angular/angular/pull/12322

import { Meta } from './angular2-meta';

// import * as LRU from 'modern-lru';

export function getLRU(lru?: any) {

  // use LRU for node

  // return lru || new LRU(10);

  return lru || new Map();

}

export function getRequest() {

  // the request object only lives on the server

  return { cookie: document.cookie };

}

export function getResponse() {

  // the response object is sent as the index.html and lives on the server

  return {};

}

// TODO(gdi2290): refactor into Universal

export const UNIVERSAL_KEY = 'UNIVERSAL_CACHE';

@NgModule({

  bootstrap: [ AppComponent ],

  imports: [

    // MaterialModule.forRoot() should be included first

    UniversalModule, // BrowserModule, HttpModule, and JsonpModule are included

    FormsModule,

    RouterModule.forRoot([], { useHash: false }),

    SharedModule.forRoot(),

    AppModule,

  ],

  providers: [

    { provide: 'isBrowser', useValue: isBrowser },

    { provide: 'isNode', useValue: isNode },

    { provide: 'req', useFactory: getRequest },

    { provide: 'res', useFactory: getResponse },

    { provide: 'LRU', useFactory: getLRU, deps: [] },

    CacheService,

    Meta,

    // { provide: AUTO_PREBOOT, useValue: false } // turn off auto preboot complete

  ]

})

export class MainModule {

  constructor(public cache: CacheService) {

    // TODO(gdi2290): refactor into a lifecycle hook

    this.doRehydrate();

  }

  doRehydrate() {

    let defaultValue = {};

    let serverCache = this._getCacheValue(CacheService.KEY, defaultValue);

    this.cache.rehydrate(serverCache);

  }

  _getCacheValue(key: string, defaultValue: any): any {

    // browser

    const win: any = window;

    if (win[UNIVERSAL_KEY] && win[UNIVERSAL_KEY][key]) {

      let serverCache = defaultValue;

      try {

        serverCache = JSON.parse(win[UNIVERSAL_KEY][key]);

        if (typeof serverCache !== typeof defaultValue) {

          console.log('Angular Universal: The type of data from the server is different from the default value type');

          serverCache = defaultValue;

        }

      } catch (e) {

        console.log('Angular Universal: There was a problem parsing the server data during rehydrate');

        serverCache = defaultValue;

      }

      return serverCache;

    } else {

      console.log('Angular Universal: UNIVERSAL_CACHE is missing');

    }

    return defaultValue;

  }

}