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

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

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 *

 * 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).

 *

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package jdk.jfr.event.io;

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

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

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.RandomAccessFile;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.test.lib.jfr.Events;

/*

 * @test

 * @summary Test with FlightRecorder enabled but with the events disabled.

 * @key jfr

 * @library /test/lib /test/jdk

 * @run main/othervm jdk.jfr.event.io.TestDisabledEvents

 */

// Verify that IO operations are correct and that no events are generated.

public class TestDisabledEvents {

    private static final int writeInt = 'A';

    private static final byte[] writeBuf = { 'B', 'C', 'D' };

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

        File tmp = File.createTempFile("TestDisabledEvents", ".tmp", new File("."));

        tmp.deleteOnExit();

        Recording recording = new Recording();

        recording.disable(IOEvent.EVENT_FILE_READ);

        recording.disable(IOEvent.EVENT_FILE_WRITE);

        recording.start();

        useRandomAccessFile(tmp);

        useFileStreams(tmp);

        useFileChannel(tmp);

        recording.stop();

        for (RecordedEvent event : Events.fromRecording(recording)) {

            final String eventName = event.getEventType().getName();

            System.out.println("Got eventName:" + eventName);

            assertNotEquals(eventName, IOEvent.EVENT_FILE_READ, "Got disabled read event");

            assertNotEquals(eventName, IOEvent.EVENT_FILE_WRITE, "Got disabled write event");

        }

    }

    private static void useRandomAccessFile(File tmp) throws Throwable {

        tmp.delete();

        try (RandomAccessFile ras = new RandomAccessFile(tmp, "rw")) {

            ras.write(writeInt);

            ras.write(writeBuf);

            ras.seek(0);

            int readInt = ras.read();

            assertEquals(readInt, writeInt, "Wrong readInt");

            byte[] readBuf = new byte[writeBuf.length];

            int readSize = ras.read(readBuf);

            assertEquals(readSize, writeBuf.length, "Wrong readSize");

            // Try to read more which should generate EOF.

            readInt = ras.read();

            assertEquals(readInt, -1, "Wrong readInt after EOF");

        }

    }

    private static void useFileStreams(File tmp) throws Throwable {

        tmp.delete();

        try (FileOutputStream fos = new FileOutputStream(tmp)) {

            fos.write(writeInt);

            fos.write(writeBuf);

        }

        try (FileInputStream fis = new FileInputStream(tmp)) {

            int readInt = fis.read();

            assertEquals(readInt, writeInt, "Wrong readInt");

            byte[] readBuf = new byte[writeBuf.length];

            int readSize = fis.read(readBuf);

            assertEquals(readSize, writeBuf.length, "Wrong readSize");

            // Try to read more which should generate EOF.

            readInt = fis.read();

            assertEquals(readInt, -1, "Wrong readInt after EOF");

        }

    }

    private static void useFileChannel(File tmp) throws Throwable {

        tmp.delete();

        try (RandomAccessFile rf = new RandomAccessFile(tmp, "rw");

                FileChannel ch = rf.getChannel()) {

            final String bufContent = "0123456789";

            final int bufSize = bufContent.length();

            ByteBuffer writeBuf = ByteBuffer.allocateDirect(bufSize);

            writeBuf.put(bufContent.getBytes());

            writeBuf.flip();

            int writeSize = ch.write(writeBuf);

            assertEquals(writeSize, bufSize, "Wrong writeSize for FileChannel");

            ch.position(0);

            ByteBuffer readBuf = ByteBuffer.allocateDirect(bufSize);

            int readSize = ch.read(readBuf);

            assertEquals(readSize, bufSize, "Wrong readSize full for FileChannel");

            assertEquals(0, writeBuf.compareTo(readBuf), "Unexpected readBuf content");

        }

    }

}