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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.api.consumer.filestream;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.HashMap;

import java.util.IdentityHashMap;

import java.util.Map;

import jdk.jfr.Event;

import jdk.jfr.Recording;

import jdk.jfr.consumer.EventStream;

import jdk.jfr.consumer.RecordedEvent;

/**

 * @test

 * @summary Test EventStream::setReuse(...)

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.consumer.filestream.TestReuse

 */

public class TestReuse {

    static class ReuseEvent extends Event {

    }

    public static void main(String... args) throws Exception {

        Path p = makeRecording();

        testSetReuseTrue(p);

        testSetReuseFalse(p);

    }

    private static void testSetReuseFalse(Path p) throws IOException {

        Map<RecordedEvent, RecordedEvent> identity = new IdentityHashMap<>();

        try (EventStream es = EventStream.openFile(p)) {

            es.setReuse(false);

            es.onEvent(e -> {

                if (identity.containsKey(e)) {

                    throw new Error("Unexpected reuse!");

                }

                identity.put(e,e);

            });

            es.start();

        }

    }

    private static void testSetReuseTrue(Path p) throws IOException {

        try (EventStream es = EventStream.openFile(p)) {

            es.setReuse(true);

            RecordedEvent[] events = new RecordedEvent[1];

            es.onEvent(e -> {

                if (events[0] == null) {

                    events[0] = e;

                } else {

                    if (e != events[0]) {

                        throw new Error("No reuse");

                    }

                }

            });

            es.start();

        }

    }

    private static Path makeRecording() throws IOException {

        try (Recording r = new Recording()) {

            r.start();

            for (int i = 0; i < 2_000_000; i++) {

                ReuseEvent e = new ReuseEvent();

                e.commit();

            }

            r.stop();

            Path p = Files.createTempFile("recording", ".jfr");

            r.dump(p);

            return p;

        }

    }

}