/*

 * Copyright (c) 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,

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 *

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package jdk.jfr.event.io;

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

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

import java.time.Duration;

import java.util.ArrayList;

import java.util.List;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.test.lib.jfr.Events;

import jdk.test.lib.thread.TestThread;

import jdk.test.lib.thread.XRun;

/*

 * @test

 * @key jfr

 * @library /test/lib /test/jdk

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

 */

public class TestSocketChannelEvents {

    private static final int bufSizeA = 10;

    private static final int bufSizeB = 20;

    private List<IOEvent> expectedEvents = new ArrayList<>();

    private synchronized void addExpectedEvent(IOEvent event) {

        expectedEvents.add(event);

    }

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

        new TestSocketChannelEvents().test();

    }

    public void test() throws Throwable {

        Recording recording = new Recording();

        try (ServerSocketChannel ss = ServerSocketChannel.open()) {

            recording.enable(IOEvent.EVENT_SOCKET_READ).withThreshold(Duration.ofMillis(0));

            recording.enable(IOEvent.EVENT_SOCKET_WRITE).withThreshold(Duration.ofMillis(0));

            recording.start();

            ss.socket().setReuseAddress(true);

            ss.socket().bind(null);

            TestThread readerThread = new TestThread(new XRun() {

                @Override

                public void xrun() throws IOException {

                    ByteBuffer bufA = ByteBuffer.allocate(bufSizeA);

                    ByteBuffer bufB = ByteBuffer.allocate(bufSizeB);

                    try (SocketChannel sc = ss.accept()) {

                        int readSize = sc.read(bufA);

                        assertEquals(readSize, bufSizeA, "Wrong readSize bufA");

                        addExpectedEvent(IOEvent.createSocketReadEvent(bufSizeA, sc.socket()));

                        bufA.clear();

                        bufA.limit(1);

                        readSize = (int)sc.read(new ByteBuffer[] { bufA, bufB });

                        assertEquals(readSize, 1 + bufSizeB, "Wrong readSize 1+bufB");

                        addExpectedEvent(IOEvent.createSocketReadEvent(readSize, sc.socket()));

                        // We try to read, but client have closed. Should get EOF.

                        bufA.clear();

                        bufA.limit(1);

                        readSize = sc.read(bufA);

                        assertEquals(readSize, -1, "Wrong readSize at EOF");

                        addExpectedEvent(IOEvent.createSocketReadEvent(-1, sc.socket()));

                    }

                }

            });

            readerThread.start();

            try (SocketChannel sc = SocketChannel.open(ss.socket().getLocalSocketAddress())) {

                ByteBuffer bufA = ByteBuffer.allocateDirect(bufSizeA);

                ByteBuffer bufB = ByteBuffer.allocateDirect(bufSizeB);

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

                    bufA.put((byte)('a' + (i % 20)));

                }

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

                    bufB.put((byte)('A' + (i % 20)));

                }

                bufA.flip();

                bufB.flip();

                sc.write(bufA);

                addExpectedEvent(IOEvent.createSocketWriteEvent(bufSizeA, sc.socket()));

                bufA.clear();

                bufA.limit(1);

                int bytesWritten = (int)sc.write(new ByteBuffer[] { bufA, bufB });

                assertEquals(bytesWritten, 1 + bufSizeB, "Wrong bytesWritten 1+bufB");

                addExpectedEvent(IOEvent.createSocketWriteEvent(bytesWritten, sc.socket()));

            }

            readerThread.joinAndThrow();

            recording.stop();

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

            IOHelper.verifyEquals(events, expectedEvents);

        }

    }

}