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

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 * 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.flightrecorder;

import java.io.IOException;

import java.io.InputStream;

import java.time.Duration;

import java.time.Instant;

import java.util.ArrayList;

import java.util.List;

import jdk.jfr.FlightRecorder;

import jdk.jfr.Recording;

import jdk.jfr.RecordingState;

import jdk.jfr.consumer.RecordedEvent;

import jdk.test.lib.Asserts;

import jdk.test.lib.jfr.Events;

import jdk.test.lib.jfr.SimpleEvent;

/* @test

 * @key jfr

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.flightrecorder.TestSnapshot

 */

public class TestSnapshot {

    private final static int RECORDING_COUNT = 5;

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

        testEmpty();

        testStopped();

        testOngoingDisk();

        testOngoingMemory();

        testMultiple();

    }

    private static void testMultiple() throws IOException {

        FlightRecorder recorder = FlightRecorder.getFlightRecorder();

        List<Recording> recordings = new ArrayList<>();

        long size = 0;

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

            Recording r = new Recording();

            r.enable(SimpleEvent.class);

            r.start();

            SimpleEvent se = new SimpleEvent();

            se.commit();

            r.stop();

            recordings.add(r);

            size += r.getSize();

        }

        try (Recording snapshot = recorder.takeSnapshot()) {

            Asserts.assertEquals(snapshot.getSize(), size);

            Asserts.assertGreaterThanOrEqual(snapshot.getStartTime(), recordings.get(0).getStartTime());

            Asserts.assertLessThanOrEqual(snapshot.getStopTime(), recordings.get(RECORDING_COUNT - 1).getStopTime());

            Asserts.assertGreaterThanOrEqual(snapshot.getDuration(), Duration.ZERO);

            assertStaticOptions(snapshot);

            try (InputStream is = snapshot.getStream(null, null)) {

                Asserts.assertNotNull(is);

            }

            List<RecordedEvent> events = Events.fromRecording(snapshot);

            Events.hasEvents(events);

            Asserts.assertEquals(events.size(), RECORDING_COUNT);

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

                Asserts.assertEquals(events.get(i).getEventType().getName(), SimpleEvent.class.getName());

            }

        }

        for (Recording r : recordings) {

            r.close();

        }

    }

    private static void testOngoingMemory() throws IOException {

        testOngoing(false);

    }

    private static void testOngoingDisk() throws IOException {

        testOngoing(true);

    }

    private static void testOngoing(boolean disk) throws IOException {

        FlightRecorder recorder = FlightRecorder.getFlightRecorder();

        try (Recording r = new Recording()) {

            r.setToDisk(disk);

            r.enable(SimpleEvent.class);

            r.start();

            SimpleEvent se = new SimpleEvent();

            se.commit();

            try (Recording snapshot = recorder.takeSnapshot()) {

                Asserts.assertGreaterThan(snapshot.getSize(), 0L);

                Asserts.assertGreaterThanOrEqual(snapshot.getStartTime(), r.getStartTime());

                Asserts.assertGreaterThanOrEqual(snapshot.getStopTime(), r.getStartTime());

                Asserts.assertGreaterThanOrEqual(snapshot.getDuration(), Duration.ZERO);

                assertStaticOptions(snapshot);

                try (InputStream is = snapshot.getStream(null, null)) {

                    Asserts.assertNotNull(is);

                }

                List<RecordedEvent> events = Events.fromRecording(snapshot);

                Events.hasEvents(events);

                Asserts.assertEquals(events.size(), 1);

                Asserts.assertEquals(events.get(0).getEventType().getName(), SimpleEvent.class.getName());

            }

            r.stop();

        }

    }

    private static void assertStaticOptions(Recording snapshot) {

        Asserts.assertTrue(snapshot.getName().startsWith("Snapshot"), "Recording name should begin with 'Snapshot'");

        Asserts.assertEquals(snapshot.getMaxAge(), null);

        Asserts.assertEquals(snapshot.getMaxSize(), 0L);

        Asserts.assertTrue(snapshot.getSettings().isEmpty());

        Asserts.assertEquals(snapshot.getState(), RecordingState.STOPPED);

        Asserts.assertEquals(snapshot.getDumpOnExit(), false);

        Asserts.assertEquals(snapshot.getDestination(), null);

    }

    private static void testStopped() throws IOException {

        FlightRecorder recorder = FlightRecorder.getFlightRecorder();

        try (Recording r = new Recording()) {

            r.enable(SimpleEvent.class);

            r.start();

            SimpleEvent se = new SimpleEvent();

            se.commit();

            r.stop();

            try (Recording snapshot = recorder.takeSnapshot()) {

                Asserts.assertEquals(snapshot.getSize(), r.getSize());

                Asserts.assertGreaterThanOrEqual(snapshot.getStartTime(), r.getStartTime());

                Asserts.assertLessThanOrEqual(snapshot.getStopTime(), r.getStopTime());

                Asserts.assertGreaterThanOrEqual(snapshot.getDuration(), Duration.ZERO);

                assertStaticOptions(snapshot);

                try (InputStream is = snapshot.getStream(null, null)) {

                    Asserts.assertNotNull(is);

                }

                List<RecordedEvent> events = Events.fromRecording(snapshot);

                Events.hasEvents(events);

                Asserts.assertEquals(events.size(), 1);

                Asserts.assertEquals(events.get(0).getEventType().getName(), SimpleEvent.class.getName());

            }

        }

    }

    private static void testEmpty() throws IOException {

        FlightRecorder recorder = FlightRecorder.getFlightRecorder();

        Instant before = Instant.now().minusNanos(1);

        try (Recording snapshot = recorder.takeSnapshot()) {

            Instant after = Instant.now().plusNanos(1);

            Asserts.assertEquals(snapshot.getSize(), 0L);

            Asserts.assertLessThan(before, snapshot.getStartTime());

            Asserts.assertGreaterThan(after, snapshot.getStopTime());

            Asserts.assertEquals(snapshot.getStartTime(), snapshot.getStopTime());

            Asserts.assertEquals(snapshot.getDuration(), Duration.ZERO);

            assertStaticOptions(snapshot);

            Asserts.assertEquals(snapshot.getStream(null, null), null);

        }

    }

}