将 @Cacheable 注释与 Reactive 控制器方法一起使用

Question

I am currently trying to implement a caching with Redis for Sprint Boot application:

@Cacheable(value = "products", key = "#id")
@GetMapping(value = "/product/{id}")
public Mono<Product> getProduct(@PathVariable("id") String sku) {
    ...
}

However, I am encountering this exception:

java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [reactor.core.publisher.MonoMapFuseable]

Based on my research, this has to do with it trying to serialize the Mono return type, rather than Product itself. So my question is, for reactive methods such as this, what is the recommended way of implementing a caching mechanism with Redis? Comments and feedback would be greatly appreciated.

Answer 1

Change return type of getProduct() from Mono to Product .

Since you are getting only one product at a time, and you are using Mono<> because it emits at most one item and then (optionally) terminates with an onComplete signal or an onError signal.

so instead of that use Product as return type and define if else for no product ie, at error state.

Or else go through these links for ways of implementing a caching mechanism with Redis

• https://www.devglan.com/spring-boot/spring-boot-redis-cache
• https://dzone.com/articles/implementation-of-redis-in-micro-servicespring-boo