[英]How to access value emitted by Flux in subscription
Flux
發出的項目(在本例中為“Red”、“White”、“Blue”)被傳遞給外部服務調用。 我在returnValue
中從外部服務獲取響應值。 我如何 map 將元素發送到外部服務並收到響應?
@Log4j2
@SpringBootApplication
class FluxFromIterableAccessFlatMapValue implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
Flux.just("Red", "White", "Blue").
flatMap(colors -> Mono.fromCallable(() -> {
// > Call to external service made here.
return "Return value from external Service call.";
})).subscribeOn(Schedulers.single())
.subscribe(returnValue ->
log.info("Need to access which element produced this response?" +
"Is it response for Red, White or Blue? " + returnValue));
}
}
我會簡單地使用元組(或任何其他包裝器)將每個響應與相應的顏色配對,如下所示:
Mono<Tuple2<String, String>> makeExternalCall(String color) {
return Mono.fromCallable(() -> {
// > Call to external service made here.
return "Return value from external Service call for color: " + color;
})
.map(response -> Tuples.of(color, response));
}
Flux.just("Red", "White", "Blue")
.flatMap(this::makeExternalCall)//Flux<Tuple2<String, String>>
.subscribeOn(Schedulers.single())
.subscribe(returnValue -> log.info("Is it response for Red, White or Blue? " + returnValue));
示例響應:
Is it response for Red, White or Blue? [Red,Return value from external Service call for color: Red]
Is it response for Red, White or Blue? [White,Return value from external Service call for color: White]
Is it response for Red, White or Blue? [Blue,Return value from external Service call for color: Blue]
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