AsyncConnectionManagerLeaseDemo.java

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 * to you under the Apache License, Version 2.0 (the
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package org.apache.hc.client5.http.observation.example;

import java.util.EnumSet;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import io.micrometer.core.instrument.Metrics;
import io.micrometer.core.instrument.search.Search;
import io.micrometer.observation.ObservationRegistry;
import io.micrometer.prometheusmetrics.PrometheusConfig;
import io.micrometer.prometheusmetrics.PrometheusMeterRegistry;
import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
import org.apache.hc.client5.http.async.methods.SimpleRequestBuilder;
import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
import org.apache.hc.client5.http.impl.async.HttpAsyncClientBuilder;
import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
import org.apache.hc.client5.http.nio.AsyncClientConnectionManager;
import org.apache.hc.client5.http.observation.HttpClientObservationSupport;
import org.apache.hc.client5.http.observation.MetricConfig;
import org.apache.hc.client5.http.observation.ObservingOptions;
import org.apache.hc.client5.http.observation.impl.MeteredAsyncConnectionManager;

public final class AsyncConnectionManagerLeaseDemo {

    public static void main(final String[] args) throws Exception {
        final PrometheusMeterRegistry reg = new PrometheusMeterRegistry(PrometheusConfig.DEFAULT);
        Metrics.addRegistry(reg);

        final ObservationRegistry obs = ObservationRegistry.create();
        final MetricConfig mc = MetricConfig.builder().prefix("demo").build();
        final ObservingOptions opts = ObservingOptions.builder()
                .metrics(EnumSet.of(ObservingOptions.MetricSet.BASIC, ObservingOptions.MetricSet.CONN_POOL))
                .build();

        final AsyncClientConnectionManager rawCm = PoolingAsyncClientConnectionManagerBuilder.create().build();
        final AsyncClientConnectionManager cm = new MeteredAsyncConnectionManager(rawCm, reg, mc, opts);

        final HttpAsyncClientBuilder builder = HttpAsyncClients.custom().setConnectionManager(cm);
        HttpClientObservationSupport.enable(builder, obs, reg, opts, mc);

        try (final CloseableHttpAsyncClient client = builder.build()) {
            client.start();

            final SimpleHttpRequest req = SimpleRequestBuilder.get("http://httpbin.org/get").build();
            final Future<SimpleHttpResponse> fut = client.execute(req, null);
            final SimpleHttpResponse rsp = fut.get(20, TimeUnit.SECONDS);
            System.out.println("status=" + rsp.getCode());
        }

        System.out.println("pool.lease  present? " + (Search.in(reg).name("demo.pool.lease").timer() != null));
        System.out.println("pool.leases present? " + (Search.in(reg).name("demo.pool.leases").counter() != null));
        System.out.println("--- scrape ---");
        System.out.println(reg.scrape());
    }

    private AsyncConnectionManagerLeaseDemo() {
    }
}