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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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package jdk.jfr.jcmd;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import jdk.jfr.Enabled;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordedObject;

import jdk.jfr.consumer.RecordingFile;

import jdk.jfr.internal.test.WhiteBox;

import jdk.test.lib.jfr.EventNames;

/*

 * @test

 * @summary Start a recording with or without path-to-gc-roots

 * @modules jdk.jfr/jdk.jfr.internal.test

 * @library /test/lib /test/jdk

 * @key jfr

 *

 * @run main/othervm -XX:TLABSize=2k jdk.jfr.jcmd.TestJcmdDumpPathToGCRoots

 */

public class TestJcmdDumpPathToGCRoots {

    private static final int OBJECT_COUNT = 100_000;

    public static List<Object[]> leak = new ArrayList<>(OBJECT_COUNT);

    public static void main(String[] args) throws Exception {

        WhiteBox.setWriteAllObjectSamples(true);

        String settingName = EventNames.OldObjectSample + "#" + "cutoff";

        // dump parameter trumps previous setting

        testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "infinity"), true);

        testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "0 ns"), true);

        testDump("path-to-gc-roots=true", Collections.emptyMap(), true);

        testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "infinity"), false);

        testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "0 ns"), false);

        testDump("path-to-gc-roots=false", Collections.emptyMap(), false);

        testDump("", Collections.singletonMap(settingName, "infinity"), true);

        testDump("", Collections.singletonMap(settingName, "0 ns"), false);

        testDump("", Collections.emptyMap(), false);

    }

    private static void testDump(String pathToGcRoots, Map<String, String> settings, boolean expectedChains) throws Exception {

        try (Recording r = new Recording()) {

            Map<String, String> p = new HashMap<>(settings);

            p.put(EventNames.OldObjectSample + "#" + Enabled.NAME, "true");

            r.setName("dodo");

            r.setSettings(p);

            r.setToDisk(true);

            r.start();

            clearLeak();

            System.out.println("Recording id: " + r.getId());

            System.out.println("Settings: " + settings.toString());

            System.out.println("Command: JFR.dump " + pathToGcRoots);

            System.out.println("Chains expected: " + expectedChains);

            buildLeak();

            System.gc();

            System.gc();

            File recording = new File("TestJcmdDumpPathToGCRoots" + r.getId() + ".jfr");

            recording.delete();

            JcmdHelper.jcmd("JFR.dump", "name=dodo", pathToGcRoots, "filename=" + recording.getAbsolutePath());

            r.setSettings(Collections.emptyMap());

            List<RecordedEvent> events = RecordingFile.readAllEvents(recording.toPath());

            if (events.isEmpty()) {

                throw new Exception("No events found in recoding");

            }

            boolean chains = hasChains(events);

            if (expectedChains && !chains) {

                System.out.println(events);

                throw new Exception("Expected chains but found none");

            }

            if (!expectedChains && chains) {

                System.out.println(events);

                throw new Exception("Didn't expect chains but found some");

            }

        }

    }

    private static void clearLeak() {

      leak.clear();

    }

    private static boolean hasChains(List<RecordedEvent> events) throws IOException {

        for (RecordedEvent e : events) {

            RecordedObject ro = e.getValue("object");

            if (ro.getValue("referrer") != null) {

                return true;

            }

        }

        return false;

    }

    private static void buildLeak() {

        for (int i = 0; i < OBJECT_COUNT;i ++) {

            leak.add(new Object[0]);

        }

    }

}