| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license |
| * agreements. See the NOTICE file distributed with this work for additional information regarding |
| * copyright ownership. The ASF licenses this file to You 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 org.apache.geode_examples.micrometerMetrics; |
| |
| import static io.micrometer.prometheus.PrometheusConfig.DEFAULT; |
| import static java.lang.Integer.getInteger; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.net.InetSocketAddress; |
| |
| import com.sun.net.httpserver.HttpContext; |
| import com.sun.net.httpserver.HttpExchange; |
| import com.sun.net.httpserver.HttpServer; |
| import io.micrometer.prometheus.PrometheusMeterRegistry; |
| import org.slf4j.Logger; |
| |
| import org.apache.geode.metrics.MetricsPublishingService; |
| import org.apache.geode.metrics.MetricsSession; |
| |
| public class SimpleMetricsPublishingService implements MetricsPublishingService { |
| private static final String PORT_PROPERTY = "prometheus.metrics.port"; |
| private static final int DEFAULT_PORT = 0; // If no port specified, use any port |
| private static final String HOSTNAME = "localhost"; |
| private static final int PORT = getInteger(PORT_PROPERTY, DEFAULT_PORT); |
| |
| private static Logger LOG = getLogger(SimpleMetricsPublishingService.class); |
| |
| private final int port; |
| private PrometheusMeterRegistry registry; |
| private HttpServer server; |
| |
| public SimpleMetricsPublishingService() { |
| this(PORT); |
| } |
| |
| public SimpleMetricsPublishingService(int port) { |
| this.port = port; |
| } |
| |
| @Override |
| public void start(MetricsSession session) { |
| registry = new PrometheusMeterRegistry(DEFAULT); |
| session.addSubregistry(registry); |
| |
| InetSocketAddress address = new InetSocketAddress(HOSTNAME, port); |
| server = null; |
| try { |
| server = HttpServer.create(address, 0); |
| |
| HttpContext context = server.createContext("/"); |
| context.setHandler(this::requestHandler); |
| server.start(); |
| |
| int boundPort = server.getAddress().getPort(); |
| LOG.info("Started {} http://{}:{}/", getClass().getSimpleName(), HOSTNAME, boundPort); |
| } catch (IOException thrown) { |
| LOG.error("Exception while starting " + getClass().getSimpleName(), thrown); |
| } |
| } |
| |
| private void requestHandler(HttpExchange httpExchange) throws IOException { |
| final byte[] scrapeBytes = registry.scrape().getBytes(); |
| httpExchange.sendResponseHeaders(200, scrapeBytes.length); |
| final OutputStream responseBody = httpExchange.getResponseBody(); |
| responseBody.write(scrapeBytes); |
| responseBody.close(); |
| } |
| |
| @Override |
| public void stop(MetricsSession session) { |
| session.removeSubregistry(registry); |
| registry = null; |
| server.stop(0); |
| } |
| } |