问题
I recently learned that with JAX-RS 2.0 long running service endpoints can make use of the @Suspended
annotation and AsyncResponse
to free resources for incoming requests while the actual work is done in the background. All client examples - at least the ones I found so far - are either calling such endpoints directly (plain http-call) or make use of the JAX-RS client API. However I was not able to figure out how to use this with the proxy-based API.
Given a REST endpoint that uses @Suspended
:
public interface HeavyLiftingService {
@GET
@Path("/heavylifting")
public void heavyLifting(@Suspended final AsyncResponse aResponse);
}
its implementation using Spring:
@Component
public class HeavyLiftingServiceImpl implements HeavyLiftingService {
@Override
@Async
public void heavyLifting(@Suspended final AsyncResponse aResponse) {
final Result result = doHeavyLifting();
aResponse.resume(result);
}
}
And a proxy-based client, that wants to obtain the result:
HeavyLiftingService proxy = JAXRSClientFactory.create("https://some-server.xyz", HeavyLiftingService.class);
proxy.heavyLifting(null); // what to put in here?
Result result = null; // how can I get the result?
Obviously there are two problems:
- What do I need to provide to the
heavyLifting
method as value for theAsyncResponse
parameter? - How can I get the result as the return type of methods using
@Suspended
has to be void?
And another question is how exceptions in the service method are handled. Will an exception automatically resume the response and return a corresponding error status?
来源:https://stackoverflow.com/questions/42845219/cxf-proxy-client-and-suspended-asyncresponse