CODEWITHSUNDEEP
javaspringasynchronous
Sok Pomaranczowy
Sok Pomaranczowy

Reputation: 1023

How to retrieve result of an @Async method

I have a small Spring Boot app waiting for REST calls to start an async job. However what I'd like to do next is get results of those async jobs and store them in DB. But I don't know how to use object returned with Future asynchronically. Here is more or less what I have:

@RequestMapping("/vlan/{id}/{name}")
public void performVLANConfig(@PathVariable("id") int id, @PathVariable("name") String name) {
    logger.debug("Received req");
    Future<ProcessedRequest> processedRequestFuture= asyncService.processVlan(id, name);

    processedRequestRepository.save(processedRequest);
}

But now it just waits for async call to end. Is there any way to let the async method live its life and after it has completed store this completition error?

Upvotes: 0

Views: 1414

Answers (1)

Sleiman Jneidi
Sleiman Jneidi

Reputation: 23329

You need to attach a callback. If you using Future then you can't attach a callback to it, assign to a ListenableFuture instead, the service needs to return a ListenableFuture of course. 

ListenableFuture<ProcessedRequest> future = asyncService.processVlan(id, name);

future.addCallback(new ListenableFutureCallback<ProcessedRequest>() {
        @Override
        public void onFailure(Throwable throwable) {
          // deal with it
        }
        @Override
        public void onSuccess(ProcessedRequest processedRequest) {
            processedRequestRepository.save(processedRequest);
        }
    });

Upvotes: 2

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