source: src/test/java/geniusweb/runserver/MaxLoadTest.java@ 43

package geniusweb.runserver;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;

import org.apache.maven.model.Model;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import geniusweb.deadline.Deadline;
import geniusweb.deadline.DeadlineTime;
import geniusweb.protocol.session.TeamInfo;
import geniusweb.protocol.session.saop.SAOPSettings;
import geniusweb.references.Parameters;
import geniusweb.references.PartyRef;
import geniusweb.references.PartyWithParameters;
import geniusweb.references.PartyWithProfile;
import geniusweb.references.ProfileRef;

/**
 * End to end test starts server, plus partyserver plus profilesserver, and then
 * tries to launch large number of parties and keep them busy. Checks and
 * reports the average CPU loads. Ensure that you have no other background tasks
 * when you run this test, to avoid incorrect CPU measurements (we can't measure
 * java-only CPU loads)
 * 
 * 
 * <h2>Large tests</h2> Tomcat-embed seems very limited in heap space. Best way
 * to test this with {@link #NUMBER_SESSIONS}>20 is to run all services on
 * standard tomcat (not embed). To achieve this, disable the @Before and @After.
 * Additionally, make sure that server.xml has maxThreads="4500" or some large
 * number sufficient for your test.
 */
public class MaxLoadTest {
        private static final int NUMBER_SESSIONS = 5;
        private static final int INTER_LAUNCH_DELAY = 20;
        private static final int PARTY_RESPONSETIME = 1;
    
        // HACK can we get it from maven?
        private static final ObjectMapper jackson = new ObjectMapper();

        /**
         * Test takes average load of last minute. It may take also a minute or two
         * to launch all sessions to start with. The average should be taken AFTER
         * all sessions were launched.
         */
        private static final long TEST_TIME_MS = 3 * 60 * 1000;

        private static final EmbeddedTomcat tomcat = new EmbeddedTomcat();
        private static final Parameters parameters = new Parameters().with("delay",
                        PARTY_RESPONSETIME);
        private static final String PROFILE1 = "ws://localhost:8080/profilesserver/websocket/get/7issues/7issues1";
        private static final String PROFILE2 = "ws://localhost:8080/profilesserver/websocket/get/7issues/7issues2";
        private static final Deadline deadline = new DeadlineTime(TEST_TIME_MS);

        private final URL url;
        private final byte[] startcommand;
        private final String GENIUSWEB_VERSION;
        private final String HARDLINER;
        

        public MaxLoadTest() throws URISyntaxException, FileNotFoundException, IOException, XmlPullParserException {
            MavenXpp3Reader reader = new MavenXpp3Reader();
            Model model = reader.read(new FileReader("pom.xml"));
                GENIUSWEB_VERSION = model.getVersion(); // actual geniusweb version in the POM.
                HARDLINER = "http://localhost:8080/partiesserver/run/hardliner-"
                                + GENIUSWEB_VERSION;

                url = new URL("http://localhost:8080/runserver/run");
                String startsession = jackson.writeValueAsString(getSettings());
                startcommand = startsession.toString().getBytes(StandardCharsets.UTF_8);
        }

        /**
         * Start up embedded tomcat servers (all: parties-, profile- and run-server)
         * 
         * @throws InterruptedException
         * 
         * @throws Throwable
         */
        @Before
        public void before() throws InterruptedException {
                tomcat.start();
                tomcat.deploy("runserver");
                tomcat.deployWar("profilesserver", new File(
                                "target/jars/profilesserver-" + GENIUSWEB_VERSION + ".war"));
                tomcat.deployWar("partiesserver", new File(
                                "target/jars/partiesserver-" + GENIUSWEB_VERSION + ".war"));
                System.out.println("waiting for server start");
                Thread.sleep(1500);// HOW do this properly?
                System.out.println("server started I hope");

        }

        @After
        public void after() throws InterruptedException {
                System.setSecurityManager(null);
                tomcat.stop();
                Thread.sleep(2000);
        }

        @Test
        public void testRunOneSession()
                        throws URISyntaxException, IOException, InterruptedException {

                for (int n = 0; n < NUMBER_SESSIONS; n++) {
                        startSession();
                        Thread.sleep(INTER_LAUNCH_DELAY);
                }

                // wait at least 1minute, becaues getLoadAver averages over 1 minute.
                long testtime = Math.max(TEST_TIME_MS + 100, 60 * 1000);
                System.out.println("Started session. Waiting termination. This should take about "+testtime/1000+"s");
                for (int n=0; n<testtime/1000; n++) {
                        System.out.print(n+".");
                        Thread.sleep(1000);
                }
                OperatingSystemMXBean operatingSystemMXBean = ManagementFactory
                                .getOperatingSystemMXBean();

                System.out.println("average load in last minute was "
                                + operatingSystemMXBean.getSystemLoadAverage());
        }

        /**
         * 
         * @return the response received from the startup request
         * @throws IOException
         * @throws ProtocolException
         * @throws IllegalStateException if party can not be launched.
         */
        private void startSession() throws IOException, ProtocolException {
                URLConnection con = url.openConnection();
                HttpURLConnection http = (HttpURLConnection) con;
                http.setRequestMethod("POST"); // PUT is another valid option
                http.setDoOutput(true);

                http.setFixedLengthStreamingMode(startcommand.length);
                http.setRequestProperty("Content-Type",
                                "application/json; charset=UTF-8");
                http.setUseCaches(false);
                http.setDoOutput(true);
                http.connect();
                try (OutputStream os = http.getOutputStream()) {
                        os.write(startcommand);
                }

                InputStream is = http.getInputStream();
                BufferedReader rd = new BufferedReader(new InputStreamReader(is));
                String response = "";
                String line;
                while ((line = rd.readLine()) != null) {
                        response += line + "\r";
                }
                rd.close();
                System.out.println("sent request. Response=" + response);
                if (!(response.startsWith("SAOP")))
                        throw new IllegalStateException(
                                        "Failed to start party:" + response);
        }

        private SAOPSettings getSettings() throws URISyntaxException {
                PartyRef partyref = new PartyRef(HARDLINER);
                PartyWithParameters party1 = new PartyWithParameters(partyref,
                                parameters);
                PartyWithParameters party2 = new PartyWithParameters(partyref,
                                parameters);
                PartyWithProfile partyprofile1 = new PartyWithProfile(party1,
                                new ProfileRef(PROFILE1));
                PartyWithProfile partyprofile2 = new PartyWithProfile(party2,
                                new ProfileRef(PROFILE2));
                TeamInfo team1 = new TeamInfo(Arrays.asList(partyprofile1));
                TeamInfo team2 = new TeamInfo(Arrays.asList(partyprofile2));

                List<TeamInfo> participants = Arrays.asList(team1, team2);
                SAOPSettings settings = new SAOPSettings(participants, deadline);
                return settings;
        }

}