io.prometheus.client.examples.random.Main.java Source code

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Here is the source code for io.prometheus.client.examples.random.Main.java

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/*
 * Copyright 2013 Prometheus Team Licensed under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package io.prometheus.client.examples.random;

import com.google.common.collect.ImmutableMap;
import io.prometheus.client.Register;
import io.prometheus.client.Registry;
import io.prometheus.client.metrics.Counter;
import io.prometheus.client.metrics.Histogram;
import io.prometheus.client.metrics.histogram.buckets.AccumulatingBucket;
import io.prometheus.client.metrics.histogram.buckets.Distributions;
import io.prometheus.client.metrics.histogram.buckets.EvictionPolicies;
import io.prometheus.client.metrics.histogram.buckets.ReductionMethods;
import io.prometheus.client.utility.servlet.MetricsServlet;
import org.apache.commons.math3.random.RandomDataImpl;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

/**
 * @author matt.proud@gmail.com (Matt T. Proud)
 */
public class Main {
    @Register(name = "rpc_calls_total", docstring = "RPC calls.", baseLabels = {})
    private static final Counter rpcCalls = new Counter();
    @Register(name = "rpc_latency_microseconds", docstring = "RPC latency.", baseLabels = {})
    private static final Histogram rpcLatency = new Histogram(new float[] { 0.01f, 0.05f, 0.5f, 0.90f, 0.99f },
            Distributions.equallySizedBucketsFor(0, 200, 4), new AccumulatingBucket.BucketBuilder(
                    EvictionPolicies.evictAndReplaceWith(10, ReductionMethods.average), 50));

    public static void main(final String[] arguments) {
        Registry.defaultInitialize();
        final Server server = new Server(8181);
        final ServletContextHandler context = new ServletContextHandler();
        context.setContextPath("/");
        server.setHandler(context);
        context.addServlet(new ServletHolder(new MetricsServlet()), "/");

        new Thread() {
            @Override
            public void run() {
                final RandomDataImpl randomData = new RandomDataImpl();

                try {
                    while (true) {
                        rpcLatency.add(ImmutableMap.of("service", "foo"), randomData.nextLong(0, 200));
                        rpcLatency.add(ImmutableMap.of("service", "bar"), (float) randomData.nextGaussian(100, 20));
                        rpcLatency.add(ImmutableMap.of("service", "zed"), (float) randomData.nextExponential(100));
                        rpcCalls.increment(ImmutableMap.of("service", "foo"));
                        rpcCalls.increment(ImmutableMap.of("service", "bar"));
                        rpcCalls.increment(ImmutableMap.of("service", "zed"));
                        Thread.sleep(1000);
                    }
                } catch (final InterruptedException e) {
                }
            }
        }.start();

        try {
            server.start();
            server.join();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}