object-cache.effects.ts

import { Injectable } from "@angular/core";
import { Actions, Effect } from "@ngrx/effects";
import { StoreActionTypes } from "../../store.actions";
import { ResetObjectCacheTimestampsAction } from "../cache/object-cache.actions";
import { Store } from "@ngrx/store";
import { ObjectCacheState } from "../cache/object-cache.reducer";

@Injectable()
export class ObjectCacheEffects {

  constructor(
    private actions$: Actions,
    private store: Store<ObjectCacheState>
  ) { }

  /**
   * When the store is rehydrated in the browser, set all cache
   * timestamps to "now", because the time zone of the server can
   * differ from the client.
   *
   * This assumes that the server cached everything a negligible
   * time ago, and will likely need to be revisited later
   */
  @Effect() fixTimestampsOnRehydrate = this.actions$
    .ofType(StoreActionTypes.REHYDRATE)
    .map(() => new ResetObjectCacheTimestampsAction(new Date().getTime()));

}