I'm trying to use spring cloud stream to solve the following problem:
I have a class that calls two separated functions (Function A and B), both of those functions must work in parallel if the Function A finishes it must call the Function C, the same happens if Function B finish but this will call Function D, then I need to wait for Function C and Function D to finish and merge both responses in a single response, and then return this merged response object to the starting class that must be waiting to get that response.
The problems I have are:
streamBridge.send
which to start Function A and Function B at the same time.I'm using
spring-cloud-stream-3.1.3
spring-cloud-stream-binder-rabbit
Required I cannot use Kafka
Required
Sample code
ServiceClass
@Service
@RequiredArgsConstructor
public class ServiceClass {
@NonNull
private final StreamBridge streamBridge;
@Override
protected MergedResponse execute(Input input) {
var send1 = streamBridge.send("functionA-in-0", input);
var send2 = streamBridge.send("functionB-in-0", input);
//TODO: Wait for Function E response object
}
}
Function A
@Slf4j
@Configuration
public class FunctionAClass{
@Bean
public Function<Input, OutputFunctionA> functionA() {
return input -> {
//TODO: Invoke Function C to pass OutputFunctionA object
return OutputFunctionA.builder.build();
};
}
}
I don't mind using Supplier
or Consumer
instead of Function
.
Edit Hi, @Oleg Zhurakousky thanks for your help, to answer your question my problem is: I have to create a REST endpoint that consume N
different third-party REST endpoints (two at first, async is a must as it will be too slow to process every request sequentially) I don't need all the data from them, just a few fields to build a common object. I'm planning to used streamBridge
to start the first two functions that will to build the required request for each third-party, then a function to invoke each of their endpoints, then a function to build a common object with each response, and finally a function that collects the commons objects and send them in the response of my service. Let me know if you have another question.
Regards.
Couple of points.
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