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ExampleBenchmark.java
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ExampleBenchmark.java
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package io.prometheus.client.exporter;
import io.prometheus.client.Gauge;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.UUID;
public class ExampleBenchmark {
public static void main(String[] args) throws Exception {
Gauge gauge = Gauge.build().name("labels").help("foo").labelNames("bar").register();
for (int i = 0; i < 10000; i++) {
gauge.labels(UUID.randomUUID().toString()).set(Math.random());
}
ServletContextHandler context = new ServletContextHandler();
context.setContextPath("/");
context.addServlet(new ServletHolder(new MetricsServlet()), "/metrics");
Server server = new Server(0);
server.setHandler(context);
server.start();
Thread.sleep(1000);
Connector connector = (Connector) server.getConnectors()[0];
byte[] bytes = new byte[8192];
URL url = new URL("http", "localhost", connector.getLocalPort(), "/metrics");
long start = System.nanoTime();
for (int i = 0; i < 100; i++) {
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
InputStream in = connection.getInputStream();
try {
while (in.read(bytes) != -1) in.available();
} finally {
in.close();
}
connection.disconnect();
}
System.out.println(String.format("%,3d ns", System.nanoTime() - start));
server.stop();
server.join();
}
}