Hit Network first and the cache

NetworkThenCache.java

 service.startupDetails(request)
   .doOnNext(new Action1<StartupDetails>() {
     @Override
     public void call(StartupDetails startupDetails) {
       startupStore.putStartupDetails(startupDetails);
     }
   })
   .onErrorReturn(new Function<Throwable, StartupDetails>() {
     @Override
     public StartupDetails apply(Throwable throwable) {
       //fetching startup details failed, will return cached value"
       return getStartupDetailsFromCache();
     }
   });