Axon 3.1:QueryBus/QueryGateway

[Peter Brantschen]

Hi

Is there somewhere a code-example about the new query bus, query gateway? An example of best practice?

Regards,

Peter

[Oscar Scholten]

Hi Peter,

Assuming you are using Spring in your application, the Axon AutoConfigurer creates a QueryGateway and SimpleQueryBus.

A small example would be:

@RestController

public class MyQueryController {

    @Autowired

    private QueryGateway queryGateway;

    @GetMapping("/query")

    public ResponseEntity doQuery() throws Exception {

        CompletableFuture<MyResult> future = queryGateway.send(new MyQuery(), MyResult.class);

        // possibly do some more work

        MyResult result = future.get();

        return new ResponseEntity<>(result, HttpStatus.CREATED);

    }

}

@Component

public class MyQueryHandler {

    @QueryHandler

    public MyResult handle(MyQuery query) {

        return new MyResult();

    }

}

Hope this helps, Oscar

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