nelsonprsousa
/ BaseLoader.cs
Last active
January 29, 2022 18:19
Useful to avoid multiple requests to the same Task<T> (e.g. an HTTP GET operation). You probably want to registered the loader as a scoped or singleton service. Bare in mind that GetOrAdd is *not* atomic, although you can use your loader safely since it is thread-safe (usage of Lazy<Task<T>> to avoid multiple operations to resolve Task<T>).
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| public abstract class BaseLoader<T> : IBaseLoader<T> | |
| where T : class | |
| { | |
| private readonly ConcurrentDictionary<string, Lazy<Task<T?>>> cache = new(); | |
| public Task<T?> LoadAsync(string key, Func<Task<T?>> factory) | |
| { | |
| return cache.GetOrAdd(key, (_) => new Lazy<Task<T?>>(factory)).Value; | |
| } | |
| } |