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import reactor.core.publisher.Mono; | |
import reactor.ipc.netty.http.client.HttpClient; | |
import reactor.ipc.netty.http.client.HttpClientResponse; | |
import reactor.ipc.netty.http.server.HttpServer; | |
import reactor.ipc.netty.http.server.HttpServerRoutes; | |
import java.nio.charset.Charset; | |
import java.util.function.Consumer; | |
import java.util.function.Function; | |
public class ReactorFibonacci { | |
private static final String HOST = "localhost"; | |
private static final int PORT = 8888; | |
public static void main(String[] args) { | |
Function<Long, Mono<Long>> fibonacci = fibonacci(httpClient()); | |
Consumer<HttpServerRoutes> routesBuilder = routesBuilder(fibonacci); | |
HttpServer httpServer = HttpServer.create(HOST, PORT); | |
httpServer.startRouterAndAwait(routesBuilder, null); | |
} | |
private static Consumer<HttpServerRoutes> routesBuilder(Function<Long, Mono<Long>> fibonacci) { | |
return routes -> routes.get("/{n}", (request, response) -> { | |
Long n = Long.valueOf(request.param("n")); | |
if (n <= 2) { | |
return response.sendString(Mono.just("1")); | |
} else { | |
Mono<Long> n_1 = fibonacci.apply(n - 1); | |
Mono<Long> n_2 = fibonacci.apply(n - 2); | |
Mono<Long> sum = n_1.and(n_2, Long::sum); | |
return response.sendString(sum.map(String::valueOf)); | |
} | |
}); | |
} | |
static HttpClient httpClient() { | |
return HttpClient.create(HOST, PORT); | |
} | |
static Function<Long, Mono<Long>> fibonacci(HttpClient httpClient) { | |
return n -> httpClient.get("/" + n) | |
.flatMap((Function<HttpClientResponse, Mono<String>>) response -> response | |
.receive() | |
.aggregate() | |
.asString(Charset.forName("UTF-8"))) | |
.map(Long::valueOf); | |
} | |
} |
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