New ThreadPoolExecutor for every request, or create a singleton spring bean of ThreadPoolExecutor

Question

I have a Restful service that uploads images to S3 bucket. I was thinking of parallel uploads using ThreadPoolExecutor.

But should I create a global pool (like Spring singleton bean), or create a new ThreadPoolExecutor on every request?

Not sure if creating a bean is great idea as corePoolSize number of threads will always be alive in the application. Thanks, in advance.

Answer 1

You can try to create Spring @Bean like:

@Bean
public ExecutorService cachedThreadPool() {
   return Executors.newFixedThreadPool(5);
}

Or you can use the inner ThreadPoolExecutor. It all depends on your needs.