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CircuitBreakerVerticle.java
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CircuitBreakerVerticle.java
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package io.vertx.howtos.resilience4j;
import io.github.resilience4j.circuitbreaker.CircuitBreaker;
import io.github.resilience4j.circuitbreaker.CircuitBreakerConfig;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.Vertx;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.client.WebClient;
import io.vertx.ext.web.client.predicate.ResponsePredicate;
import io.vertx.ext.web.codec.BodyCodec;
import java.time.Duration;
// tag::class[]
public class CircuitBreakerVerticle extends AbstractVerticle {
// end::class[]
// tag::main[]
public static void main(String[] args) {
Vertx vertx = Vertx.vertx();
vertx.deployVerticle(new CircuitBreakerVerticle());
}
// end::main[]
// tag::start[]
@Override
public void start() {
// tag::circuit-breaker[]
CircuitBreaker cb = CircuitBreaker.of("my-circuit-breaker", CircuitBreakerConfig.custom()
.minimumNumberOfCalls(5)
.build());
// end::circuit-breaker[]
// tag::router[]
Router router = Router.router(vertx);
WebClient client = WebClient.create(vertx);
router.get("/").handler(ctx -> {
VertxCircuitBreaker.executeFuture(cb, () -> {
return client.get(8080, "localhost", "/does-not-exist")
.as(BodyCodec.string())
.expect(ResponsePredicate.SC_SUCCESS)
.send();
})
.onSuccess(response -> ctx.end("Got: " + response.body() + "\n"))
.onFailure(error -> ctx.end("Failed with: " + error.toString() + "\n"));
});
// end::router[]
// tag::server[]
vertx.createHttpServer()
.requestHandler(router)
.listen(8080)
.onSuccess(server -> {
System.out.println("HTTP server started on port " + server.actualPort());
});
// end::server[]
}
// end::start[]
// tag::class[]
}
// end::class[]