Java tutorial
/* Copyright 2016 Artem Stasiuk 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 com.github.terma.m.node; import com.github.terma.m.node.gigaspace.GigaSpaceTypeChange; import com.github.terma.m.node.gigaspace.GigaSpaceTypeCount; import com.github.terma.m.node.jmx.Jmx; import com.github.terma.m.shared.Event; import com.github.terma.m.shared.NodeConfig; import com.google.gson.Gson; import org.apache.commons.io.IOUtils; import org.hyperic.sigar.NetInterfaceStat; import org.hyperic.sigar.Sigar; import java.io.IOException; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.concurrent.TimeUnit; import java.util.logging.Level; import java.util.logging.Logger; import static java.util.Collections.singletonList; public class Node { private static final Logger LOGGER = Logger.getLogger(Node.class.getName()); private static final Sigar sigar = new Sigar(); private static void send(final String serverHost, final int serverPort, final String context, final List<Event> events) throws IOException { final HttpURLConnection connection = (HttpURLConnection) new URL("http", serverHost, serverPort, context + "/node").openConnection(); connection.setDoOutput(true); connection.setRequestMethod("POST"); connection.setRequestProperty("Content-Type", "text/json"); connection.setRequestProperty("charset", "utf-8"); connection.setUseCaches(false); connection.setInstanceFollowRedirects(false); connection.connect(); OutputStream outputStream = connection.getOutputStream(); outputStream.write(new Gson().toJson(events).getBytes()); connection.getInputStream().read(); outputStream.close(); } public static void main(String[] args) throws IOException { String configJson = IOUtils.toString(Node.class.getResourceAsStream("/config.json")); NodeConfig nodeConfig = new Gson().fromJson(configJson, NodeConfig.class); LOGGER.info("Starting node with config: " + configJson); run(nodeConfig); } public static void run(final NodeConfig nodeConfig) { final long millisToRefresh = TimeUnit.SECONDS.toMillis(nodeConfig.secToRefresh); final List<Checker> checkers = buildCheckers(nodeConfig); while (true) { final long cycleStart = System.currentTimeMillis(); final List<Event> events = new ArrayList<>(); for (final Checker checker : checkers) { final long checkStart = System.currentTimeMillis(); try { events.addAll(checker.get()); LOGGER.info( "Check: " + checker + ", done: " + (System.currentTimeMillis() - checkStart) + " msec"); } catch (Exception e) { LOGGER.log(Level.SEVERE, "Check: " + checker + ", fail: " + (System.currentTimeMillis() - checkStart) + " msec", e); e.printStackTrace(); } } LOGGER.info("Cycle done, checks: " + checkers.size() + ", events: " + events.size() + " in: " + (System.currentTimeMillis() - cycleStart) + " msec"); final long sendStart = System.currentTimeMillis(); try { send(nodeConfig.serverHost, nodeConfig.serverPort, nodeConfig.serverContext, events); } catch (final IOException exception) { exception.printStackTrace(); } LOGGER.info("Send, events: " + events.size() + " done: " + (System.currentTimeMillis() - sendStart) + " msec"); try { Thread.sleep(millisToRefresh); } catch (InterruptedException e) { return; } } } private static List<Checker> buildCheckers(final NodeConfig nodeConfig) { final List<Checker> checkers = new ArrayList<>(); for (final Map<String, String> checkConfig : nodeConfig.checks) { final String name = checkConfig.get("name"); if (name.equals("host.mem")) { checkers.add(new HostMem(nodeConfig.host)); } else if (name.equals("host.cpu")) { checkers.add(new HostCpu(nodeConfig.host)); } else if (name.equals("host.net")) { checkers.add(new HostNet(nodeConfig.host)); } else if (name.equals("jvm")) { checkers.add(new Jvm(nodeConfig.host, checkConfig)); } else if (name.equals("jmx")) { checkers.add(new Jmx(nodeConfig.host, checkConfig)); } else if (name.equals("gigaSpaceCount")) { checkers.add(new GigaSpaceTypeCount(nodeConfig.host, checkConfig)); } else if (name.equals("gigaSpaceChange")) { checkers.add(new GigaSpaceTypeChange(nodeConfig.host, checkConfig)); } } return checkers; } private static class HostMem extends HostAwareChecker { HostMem(String host) { super(host); } public List<Event> get() throws Exception { return Arrays.asList(new Event(host + ".host.mem.used", sigar.getMem().getUsed()), new Event(host + ".host.mem.total", sigar.getMem().getTotal()), new Event(host + ".host.mem.swap.used", sigar.getSwap().getUsed())); } } private static class HostNet extends HostAwareChecker { HostNet(String host) { super(host); } public List<Event> get() throws Exception { long tx = 0; long rx = 0; for (String intr : sigar.getNetInterfaceList()) { NetInterfaceStat stat = sigar.getNetInterfaceStat(intr); tx += stat.getTxBytes(); rx += stat.getRxBytes(); } return Arrays.asList(new Event(host + ".host.net.rx", rx), new Event(host + ".host.net.tx", tx)); } } private static class HostCpu extends HostAwareChecker { HostCpu(String host) { super(host); } public List<Event> get() throws Exception { return singletonList(new Event(host + ".host.cpu", Math.round(sigar.getCpuPerc().getCombined() * 100))); } } }