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UrbanObservatoryHttpClient.java
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UrbanObservatoryHttpClient.java
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package docsamples;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.Executors;
import java.util.concurrent.Flow;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.http.HttpClient;
import io.vertx.core.http.HttpClientRequest;
import io.vertx.core.http.HttpMethod;
import io.vertx.core.http.RequestOptions;
import mutiny.zero.vertxpublishers.VertxPublisher;
public class UrbanObservatoryHttpClient {
public static void main(String[] args) {
Vertx vertx = Vertx.vertx();
ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
RequestOptions opts = new RequestOptions()
.setSsl(true)
.setHost("api.usb.urbanobservatory.ac.uk")
.setPort(443)
.setMethod(HttpMethod.GET)
.addHeader("Accept", "application/json")
.setURI("/api/v2.0a/sensors/entity");
HttpClient httpClient = vertx.createHttpClient();
Flow.Publisher<Buffer> publisher = VertxPublisher.fromFuture(() -> httpClient
.request(opts)
.compose(HttpClientRequest::send));
publisher.subscribe(new Flow.Subscriber<>() {
private Flow.Subscription subscription;
@Override
public void onSubscribe(Flow.Subscription s) {
System.out.println("======================================");
this.subscription = s;
s.request(1L);
}
@Override
public void onNext(Buffer buffer) {
System.out.print(buffer.toString(StandardCharsets.UTF_8));
executor.schedule(() -> subscription.request(1L), 500, TimeUnit.MILLISECONDS);
}
@Override
public void onError(Throwable t) {
System.out.println("======================================");
t.printStackTrace();
}
@Override
public void onComplete() {
System.out.println("======================================");
}
});
}
}