/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jfr.internal.instrument;

import java.io.IOException;

import java.net.InetSocketAddress;

import java.nio.ByteBuffer;

import jdk.jfr.events.SocketReadEvent;

import jdk.jfr.events.SocketWriteEvent;

/**

 * See {@link JITracer} for an explanation of this code.

 */

@JIInstrumentationTarget("sun.nio.ch.SocketChannelImpl")

final class SocketChannelImplInstrumentor {

    private SocketChannelImplInstrumentor() {

    }

    private InetSocketAddress remoteAddress;

    @SuppressWarnings("deprecation")

    @JIInstrumentationMethod

    public int read(ByteBuffer dst) throws IOException {

        SocketReadEvent event = SocketReadEvent.EVENT.get();

        if (!event.isEnabled()) {

            return read(dst);

        }

        int bytesRead = 0;

        try {

            event.begin();

            bytesRead = read(dst);

        } finally {

            event.end();

            if (event.shouldCommit())  {

                String hostString  = remoteAddress.getAddress().toString();

                int delimiterIndex = hostString.lastIndexOf('/');

                event.host      = hostString.substring(0, delimiterIndex);

                event.address   = hostString.substring(delimiterIndex + 1);

                event.port      = remoteAddress.getPort();

                if (bytesRead < 0) {

                    event.endOfStream = true;

                } else {

                    event.bytesRead = bytesRead;

                }

                event.timeout   = 0;

                event.commit();

                event.reset();

            }

        }

        return bytesRead;

    }

    @SuppressWarnings("deprecation")

    @JIInstrumentationMethod

    public long read(ByteBuffer[] dsts, int offset, int length) throws IOException {

        SocketReadEvent event = SocketReadEvent.EVENT.get();

        if(!event.isEnabled()) {

            return read(dsts, offset, length);

        }

        long bytesRead = 0;

        try {

            event.begin();

            bytesRead = read(dsts, offset, length);

        } finally {

            event.end();

            if (event.shouldCommit()) {

                String hostString  = remoteAddress.getAddress().toString();

                int delimiterIndex = hostString.lastIndexOf('/');

                event.host      = hostString.substring(0, delimiterIndex);

                event.address   = hostString.substring(delimiterIndex + 1);

                event.port      = remoteAddress.getPort();

                if (bytesRead < 0) {

                    event.endOfStream = true;

                } else {

                    event.bytesRead = bytesRead;

                }

                event.timeout   = 0;

                event.commit();

                event.reset();

            }

        }

        return bytesRead;

    }

    @SuppressWarnings("deprecation")

    @JIInstrumentationMethod

    public int write(ByteBuffer buf) throws IOException {

        SocketWriteEvent event = SocketWriteEvent.EVENT.get();

        if (!event.isEnabled()) {

            return write(buf);

        }

        int bytesWritten = 0;

        try {

            event.begin();

            bytesWritten = write(buf);

        } finally {

            event.end();

            if (event.shouldCommit()) {

                String hostString  = remoteAddress.getAddress().toString();

                int delimiterIndex = hostString.lastIndexOf('/');

                event.host         = hostString.substring(0, delimiterIndex);

                event.address      = hostString.substring(delimiterIndex + 1);

                event.port         = remoteAddress.getPort();

                event.bytesWritten = bytesWritten < 0 ? 0 : bytesWritten;

                event.commit();

                event.reset();

            }

        }

        return bytesWritten;

    }

    @SuppressWarnings("deprecation")

    @JIInstrumentationMethod

    public long write(ByteBuffer[] srcs, int offset, int length) throws IOException {

        SocketWriteEvent event = SocketWriteEvent.EVENT.get();

        if (!event.isEnabled()) {

            return write(srcs, offset, length);

        }

        long bytesWritten = 0;

        try {

            event.begin();

            bytesWritten = write(srcs, offset, length);

        } finally {

            event.end();

            if (event.shouldCommit()) {

                String hostString  = remoteAddress.getAddress().toString();

                int delimiterIndex = hostString.lastIndexOf('/');

                event.host         = hostString.substring(0, delimiterIndex);

                event.address      = hostString.substring(delimiterIndex + 1);

                event.port         = remoteAddress.getPort();

                event.bytesWritten = bytesWritten < 0 ? 0 : bytesWritten;

                event.commit();

                event.reset();

            }

        }

        return bytesWritten;

    }

}