/*

 * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.

 * 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,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package jdk.test.lib.jfr;

import static jdk.test.lib.Asserts.assertEquals;

import static jdk.test.lib.Asserts.fail;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.List;

import jdk.jfr.Recording;

import jdk.jfr.RecordingState;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordingFile;

import jdk.test.lib.Asserts;

/**

 * Common helper class.

 */

public final class CommonHelper {

    private static RecordedEvent timeStampCounterEvent;

    public static void verifyException(VoidFunction f, String msg, Class<? extends Throwable> expectedException) throws Throwable {

        try {

            f.run();

        } catch (Throwable t) {

            if (expectedException.isAssignableFrom(t.getClass())) {

                return;

            }

            t.printStackTrace();

            assertEquals(t.getClass(), expectedException, "Wrong exception class");

        }

        fail("Missing Exception for: " + msg);

    }

    public static Recording verifyExists(long recId, List<Recording> recordings) {

        for (Recording r : recordings) {

            if (recId == r.getId()) {

                return r;

            }

        }

        Asserts.fail("Recording not found, id=" + recId);

        return null;

    }

    public static void waitForRecordingState(Recording r, RecordingState expectedState) throws Exception {

        while (r.getState() != expectedState) {

            Thread.sleep(20);

        }

    }

    public static void verifyRecordingState(Recording r, RecordingState expectedState) throws Exception {

        assertEquals(expectedState, r.getState(), "Wrong state");

    }

    public static boolean hasFastTimeEnabled() throws Exception {

        return getTimeStampCounterEvent().getValue("fastTimeEnabled");

    }

    private synchronized static RecordedEvent getTimeStampCounterEvent() throws IOException, Exception {

        if (timeStampCounterEvent == null) {

            try (Recording r = new Recording()) {

                r.enable(EventNames.CPUTimeStampCounter);

                r.start();

                r.stop();

                r.dump(p);

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

                Files.deleteIfExists(p);

                if (events.isEmpty()) {

                    throw new Exception("Could not locate CPUTimeStampCounter event");

                }

                timeStampCounterEvent = events.get(0);

            }

        }

        return timeStampCounterEvent;

    }

    public static void waitForSystemCurrentMillisToChange() {

        long t = System.currentTimeMillis();

        while (t != System.currentTimeMillis()) {

            try {

                Thread.sleep(2);

            } catch (InterruptedException e) {

               throw new Error("Sleep interupted", e);

            }

        }

    }

}