FeedMyTummy

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donnywals

/*
 Here's our goal:

 let localDataStore = UserDataStore()
 let remoteDataStore = UserApi()
 let dataStore = CacheBackedDataStore(localDataStore, remoteDataStore)

 dataStore.fetch(userID) { result in
   // handle result
 }

rdv0011

There is a function .retry() in Combine that helps to retry a request when something goes wrong with a long runing task. Although it is not enough just to call retry() to achieve retrying logic. The retry() function does not do another request but it re-subscribes only to a publisher. The below approaches might be used to solve the problem.

Using tryCatch

To make another request the tryCatch() might be used. In the code below if the first call fails there are three attempts to retry (retry(3)) that are made:

import UIKit
import Combine
import PlaygroundSupport

enum CustomNetworkingError: Error {
    case invalidServerResponse

mycodeschool

/* Doubly Linked List implementation */
#include<stdio.h>
#include<stdlib.h>

struct Node  {
	int data;
	struct Node* next;
	struct Node* prev;
};